How are Elevated Concrete Slabs Poured?

How are Elevated Concrete Slabs Poured?

Elevated concrete slabs (also known as suspended concrete slabs) are most commonly found in commercial offices, parking garages, and other multistory heavy-use buildings. 

These pours require a bit more skill than your everyday residential concrete driveway and will need to be carried out by a professional contractor

Multiple factors are involved in pouring elevated concrete slabs, including the weight of the floor and the effect any additional loads will have on it. 

This is how it’s done.

1. The supporting walls are built according to the structural plans

The first step in pouring an elevated concrete slab involves building the supporting walls according to the structural plans. These walls can either be created out of reinforced concrete or concrete blockwork.

2. A crane is used to lower the metal into place

After the supporting walls have been constructed, a metal slab pan is lowered into place using a tower crane. This pan will be used as the framework for pouring and forming the elevated concrete slab. You can also use a system of connected preformed concrete panels instead.

3. Reinforced steel mesh is laid into the pan

Before the concrete is poured, reinforced steel mesh is laid into the pan and is lifted slightly off the floor using chairs (small metal supports) that are evenly spaced apart. This step is what gives the floor the strength necessary to support itself. 

In larger buildings, precast concrete floors that’ve been previously reinforced with tensile steel bars might be required for maximum strength. 

4. The concrete is poured and cured

Finally, after everything has been laid out and arranged according to plan, the concrete is mixed and poured in agreement with the structural engineers’ recommendations. 

The slab must then be left to cure for at least 48 hours before anyone can walk on it. The time it will take before anyone can park or drive on it will vary depending on several factors.

At Port Aggregates, our skilled contractors have over 40 years’ worth of experience built into our tried and trusted techniques. Whether you’re looking for a residential driveway, commercial suspended slabs, or precast concrete, we’ve got you covered. Contact us today to request a quote

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Rip Rap: The Original Rock Wall

Rip Rap: The Original Rock Wall

If you’ve ever walked along a shoreline or under a bridge, chances are that you’ve seen what’s called rip rap

This rocky material is a form of crushed limestone that comes in a range of sizes. It can be anywhere from 4 inches to over 2 feet in width, depending on how fast the surrounding water moves and the steepness of the slope that it will be placed upon.

What Does Rip Rap Do?

The main purpose of rip rap is to prevent erosion on a pond bank, hill, or slope. Without this protection, roadways wash out, bridges become compromised, and property gets lost.

However, erosion prevention is not its only benefit. 

Contractors prefer rip rap because of its extreme durability and natural appearance. The reliability and affordability of this material make it the ideal choice for protecting bridges, pilings, shorelines, and streambeds from damage caused by water and ice.

Rip rap also buffers the impact of waves crashing against the shore and the force of water against the bank. In these cases, a larger grade (like our #1x4G) is installed over a textile for ultimate protection.

Where Can Rip Rap be Used?

Rip rap is most useful to structures or shorelines that are continuously exposed to rushing water. For example: near a bridge that’s located alongside an embankment, adjacent to waterway supports, and along a lake shoreline or the outer bank of a river bend.

It can also be used to build low-lying dividing walls or planting areas. In really steep slopes or high drainage areas, wire mesh or chain link is needed at the base of the decline to hold the rip rap in place.

At Port Aggregates, we offer three types of rip rap:

10lb rip rap (6-10”)30lb rip rap55lb rip rap

Regardless of whether you’re looking to prevent bridge erosion or simply trying to build a garden, we’ve got you covered. Our high-quality crushed limestone is available in a variety of shapes and sizes to meet your unique needs. Contact Port Aggregates today to request a quote

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3 Benefits of a Stamped Concrete Patio

3 Benefits of a Stamped Concrete Patio

After last year, we can all use a little extra fun this summer.

Not ready to go out yet? No worries!

By adding a patio to your backyard or enhancing your current one, you can bring the party straight to your house.

A stamped concrete patio is one of the best investments you can make this summer for a few reasons:

1. The material is unmatched

Compared to other popular choices like wood or pavers, stamped concrete is substantially more durable, easier to install, and requires a lot less maintenance. Not to mention, it can mimic the appearance of any other material at the most budget-friendly price on the market. 

2. It can be made to match any style

The stamped concrete process is pretty self-explanatory. It gets its appearance through specially-designed rubber roller stamps that are pressed into the wet material. Whether you want your slab to look like tile, wood, brick, or precious stone, it’s all possible. 

The options are truly endless with this type of concrete. Using stains, dyes, colored epoxy finishes, engravings, and overlays, your patio can be made to match any color scheme and incorporate any special logos, designs, patterns, or other features. 

3.  It opens up the door to so many possibilities

A stamped concrete patio can transform your yard into the ultimate summer fun space. Have you always wanted an outdoor kitchen? Are your kids fantasizing about roasting marshmallows over an open fire this summer?

All of this is possible when you have a beautiful outdoor space to gather. No matter what your style or taste is, you can make your dreams come true with a stamped concrete patio. 

Don’t let COVID steal another summer. Turn your home into the ultimate staycation resort with decorative concrete! At Port Aggregates, we’re here to help you create the perfect concrete patio to match your unique taste.

With more than 40 years in business and 24 locations across Louisiana, our contractors are well-versed in decorative concrete installation and design. Contact Port Aggregates today to request a quote

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What can Precast Concrete be Used For?

What can Precast Concrete be Used For?

Known for its immense strength, durability, and endurance, concrete is the number one building material in the world. It’s been used for centuries and can last for thousands of years.

There are several different types of concrete, but today we’re going to take a look at precast and its many uses. 

What is precast concrete?

Precast concrete is formed using a mold and is often used to create columns, beams, or parking curbs. It can be produced in mass quantities due to specifications and codes that are already established. This building process is extremely efficient, allowing for hundreds of large structures to be built in just a few weeks.

The purpose of precast and its many uses

Precast concrete is built above the ground and can be used to stabilize large pieces of earth or hold back dirt. This makes it a great choice for building large retaining walls or smaller retention ponds. 

Three-sided bridges and box culverts for marshland and stream crossings also call for precast concrete. A strong material is particularly essential for structures like these. Otherwise, traveling over this type of land would be impossible without damaging the environment. 

In certain cases, custom pieces can even be made to meet your unique needs; for example, creating a vault using more than one piece when preexisting blockages are in the way. In these circumstances, individual precast panels are constructed and the vaults are then pieced together in place. Other custom examples may include railroad crossings or boat ramps.

Precast concrete is also used to construct buried infrastructure like catch basins, manholes, and vaults. These structures can be used to house telecommunication or electrical junction boxes, move storm water or sewage, and retain water.

Understanding the benefits

One of the biggest perks of precast concrete is that it’s ready to install when you are. This is one of the main shortcomings of site-casted concrete, because weather can delay the pour. Because precast concrete is created within a controlled environment, this is not an issue.

Another major benefit is the fact that strength-testing has already occurred before delivery day. Site-casted concrete, however, requires extra time and effort on the day of the pour to add rebar, set forms, and monitor the product.

When it comes to the production of precast concrete, the process alone is extremely sustainable. At Port Aggregates, all of our concrete products are made with the highest quality materials. It’s why we’ve been trusted for over 40 years! Contact us today to request a quote

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How to Remove Stains From Concrete Flooring

How to Remove Stains From Concrete Flooring

One of the biggest concerns that people have when it comes to concrete flooring is how to clean it efficiently.

Fortunately, removing stains from a concrete floor is not nearly as difficult or complicated as it sounds. 

Here are a few stain removal tricks to help you maintain spectacular looking concrete floors.

Removing paint stains

Timing is everything when it comes to a paint stain on concrete flooring. For the best results, it’s critical to act as quickly as possible. 

For a fresh spill, start by putting on goggles for eye protection, then mix together one cup of trisodium phosphate (TSP) with four liters of hot water. Pour the mixture over the paint, scrub it with a long brush, and pressure rinse it until the stain is removed. 

Unfortunately, if you’re dealing with a very large spill, there may always be a slight hint of color left on the concrete.

Removing oil

Oil stains are some of the ugliest, most stubborn stains out there. If possible, try to absorb the oil as soon as you notice it so that it doesn’t penetrate into the concrete. 

Believe it or not, your best bet against a fresh oil stain is to pour cat litter or mud over it, then scrub with a stiff brush or broom. Leave the cat litter or mud on top of the stain for at least an hour before sweeping it away. For tougher stains, leave it overnight.

If this doesn’t completely do the trick, mix together one cup of TSP with hot water, then pour this on top of the stain. Let it sit for at least 30 minutes before scrubbing with a rigid nylon brush and hosing it off with pressurized water. 

Removing mud

When mud is left for too long on concrete flooring, it can leave an ugly brown stain. Fortunately, this is one of the easiest stains to remove. Simply mix together some dishwashing detergent and warm water into a spray bottle, shake it, and squirt it over the stain. Let it sit for around 10 minutes, then scrub it off with a nylon brush and rinse with a high-pressure hose.

Removing rust stains

Unfortunately, rust stains on concrete are quite difficult to remove entirely. Large, old rust stains often require a special rust remover. But for smaller, newer rust stains, using vinegar is your best bet. 

Just pour it on the stain, let it sit for at least 10 minutes before scrubbing with a nylon brush, and its acidic properties will eat away the rust. Rinsing and repeating may be required. 

Looking for more tips on concrete and how to clean it? Check out the Port Aggregates blog

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4 Steps to Prepare Your Stamped Concrete for Summer

4 Steps to Prepare Your Stamped Concrete for Summer

When it comes to taking care of stamped concrete, summer is the best season to do so.

With temperatures rising in Louisiana, now is the time to start preparing your concrete for the warmer weather to come.

To increase the longevity of your decorative concrete, you must follow the following 4 steps when preparing your slab for summer.

1. Make sure you don’t need to strip your concrete

After a particularly harsh winter (like the record-breaking freeze of 2020), you may want to consider resealing your concrete. 

Before you do so, however, you may wonder whether or not it’s necessary to strip off the old sealer first.

Fortunately, as long as your slab has been around longer than the early 2000s and has been stripped once before, it will not need stripping prior to resealing.

2. Power wash your slab

Once you’ve concluded whether or not you need to strip your stamped concrete, you’ll want to power wash it before you proceed with anything else.

Pollen, leaf, and tire stains can create such an eyesore. Power washing your slab is ideal for clearing away all the dirt, grime, and stains that have built up over the past year.

If you’ve got tough stains from oil and tar, you should use neutral soap, a solvent cleaner, or a degreaser first. This will loosen the stain which can then be sprayed off with the power washer.

3. Check for cracks

After your stamped concrete has been fully cleaned, scan it with your eyes for cracks. Most hairline fractures can be fixed on your own, but long and deep cracks may require you to replace the slab altogether.

4. Seal your concrete

If you haven’t resealed your concrete in the past three years, now is the best time to do so. Sealer is most effectively applied during warm weather on dry concrete. If you’re planning on sealing your concrete this spring, be sure to check the weather ahead of time, as the sealer will need a couple of days with no rain in order to dry properly.

Looking for more concrete tips and tricks? Check out the Port Aggregates blog

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Your Guide to Colored Concrete

Your Guide to Colored Concrete

When you think of concrete, you probably visualize a boring, grey slab.

Not many people associate concrete with color, but with the help of aesthetic treatments, it can really become a true work of art.

Before you start your next colored concrete project, it’s important to understand the advantages and ingredients involved.

Key benefits

1. Enhancing the appearance of your yard

The first and most obvious benefit of colored concrete is its aesthetic appeal. Whether you’re incorporating it into your new driveway or backyard patio, you’d be surprised at the difference a simple pop of color can make to your yard. 

But beauty isn’t its only benefit. 

2. Extra protection

The aesthetic treatments used to give colored concrete its pigment also provide a practical, wear-resistant coating and a beautiful finish. This will help your gorgeous slab maintain its fresh look over time, protecting it from weather and the damage of day-to-day use.

Understanding the two techniques

When it comes to concrete coloring, there are two main techniques: 

1. Stirring the colorant into the concrete mix itself 

This mixing technique is most commonly used in projects that desire one solid color. It works by mixing in a powdered pigment made up of inorganic minerals into the ready mix. This pigment is oftentimes made of chromium oxides and iron. 

2. Stamping the concrete

Concrete stamping, on the other hand, is used for projects that require special patterns or designs. This method involves layering colorant on top of fresh concrete then stamping it with texturing molds. This colorant is either made up of synthetic or natural pigments.

Synthetic pigments

Synthetic pigments are made up of metallic oxides and are created through industrial processes. During these processes, minerals (the raw material) are refined to change their physio-chemical properties.

These physio-chemical properties are what link each metallic oxide to their specific color. Cobalt oxide, for example, is a metallic oxide used to create blue concrete.

Natural pigments

Natural pigments are derived from mineral deposits, and like synthetic pigments, they’re made up of metallic oxides and hydroxides. Iron is most commonly used to apply this pigmentation.

Get prettier, longer-lasting concrete by coloring it. At Port Aggregates, our professional concrete contractors are highly skilled in creating beautiful, precise pours every time. Contact us today to request a quote for your next project!

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How to Avoid Concrete Failure

How to Avoid Concrete Failure

While concrete is extremely strong, it can also be very brittle if it’s not properly mixed and cured. Concrete failure can occur in a variety of ways because of the versatility of this material and all of its applications.

Each type of failure is different and has its own causes and solutions. It’s important to understand how these common types of failures occur so that your project is not negatively affected.

Keep reading to learn 5 tips for preventing concrete failure.

1. Avoid trapped air 

Trapped air bubbles in concrete can cause it to fail. Concrete is a mixture of gravel, sand, and cement (among other ingredients), and when this mix gets poured into forms or molds, trapped air bubbles can form. 

These bubbles result in weak spots that aren’t able to handle pressure.

To avoid trapped air when mixing concrete, ideally, you should hire a professional with a mixer truck rather than attempting to mix and pour on your own. 

When mixing on your own, you risk adding too much water to the mix or mixing it for too long. This can cause small cracks and fissures which will leave your concrete vulnerable as well. 

2. Don’t overload concrete forms

Overloading concrete is another common cause of concrete failure. While concrete is one of the strongest materials on the planet, different types have different limits. For example, reinforced concrete should be used if you anticipate supporting a large weight or structure.

Unfortunately, some cheap contractors like to cut corners here by using the wrong type of concrete to complete the job faster. Then, once heavy loads are placed on the concrete, it cracks.

3. Always use good quality raw materials

Using good quality raw materials is another way to avoid concrete failure. This goes for both the sand and gravel used in your mix as well as the cement itself.

If you’re not using a reputable supplier, there’s no telling what sorts of additives they may be including in their products (or if any at all). 

For example, recycled or fly ash cement can sometimes be used in place of traditional Portland cement. While this is cheaper, it also has a shorter lifespan and may not meet the standards you’re looking for.

The same goes for sand or gravel that doesn’t measure up to your specifications. If it’s too coarse, the concrete mix won’t have enough cohesion between particles which can cause the material to crumble.

If you want strong, durable, and long-lasting concrete, always make sure to use a reputable contractor and supplier for raw materials.

4. Use water treated with low levels of dissolved sulphate

Using water with low levels of dissolved sulphate is another way to avoid concrete failure. You see, metal ions (especially iron or steel) can lead to the formation of rust within your concrete mix which will make it vulnerable and prone to cracking.

The easiest thing you can do here is use deionized water in place of tap water. If this isn’t available, try to use water with low levels of dissolved sulphate. This will prevent the metal ions from being deposited into your concrete mix which will result in a stronger material overall.

5. Don’t use high-silica aggregates in areas with high humidity

If you’re using high-silica aggregates in areas with high humidity, you may run into concrete failure. This is because the aggregates will absorb moisture from the air, leading to cracks within your material over time.

For example, if you’re creating a sidewalk or patio in a high-humidity area like Louisiana, and you use this sort of aggregate without a waterproof coating, you may be in for a rude awakening.

6. Hire the professionals

Concrete failure is expensive. The best way to avoid it is by hiring the professionals at Port Aggregates.

At PAI, our professional concrete contractors are skilled in creating bubble-free, high-quality pours in high-humidity areas like Louisiana.  We use only the best quality materials for our mixes and never cut corners to save money or time. 

Contact us today to request a quote for your next residential or commercial project!

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How to make green roofs really green?

How to make green roofs really green?

After three years of research, design and construction, our 130 square meter roof is finally finished! 

We are happy to share with you an overview of all the steps we went through, the sustainable technologies we integrated into this project, and the impact we think green roofs can have on our urban landscapes. 

Watch the video below for an explainer of the process of constructing our ecological green roof: 

This journey started three years ago with the demolition of the old roof and replacement with a glulam structure. Along the way we integrated several sustainable technologies that we have documented with articles and videos. For instance, we used recycled tyres for the foundations of our wooden wall structure and protected the exterior timber facade using our charring technique inspired in the traditional japanese process of Yakisugi. 

For more information about these researches, check our previous articles here.

CHARRING STATION

Charring Station

TYRE FOUNDATION

Green roofs are often proposed as a solution to the lack of green space in urban environments or as a way of slowing down the flow of water. But do conventional green roofs actually deliver on these claims? Our research of modern green roofs found that the materials used in construction often do not align with the sustainability ethos that a green roof proclaims. We sought to find alternatives to plastic filters, insulation, and drainage systems: the materials that typically make up the layers of a green roof. In our mission to adopt low-tech, sustainable architecture and construction techniques we wanted to reduce material consumption and also make it as easy to replicate and apply in other situations as possible.

Our green roof layers


Green Roof detail

EPDM


Laying EPDM around rooflights
Silicone fixing
EPDM Silicone

We needed a waterproof layer to cover the OSB roof layer and protect from water ingress. We chose EPDM, a synthetic rubber, due to its availability and long life span. 

Geotextile

To protect the cork from the plant roots and the substrate a geotextile layer is needed. This prevents silt and other fine particles from clogging the grid drainage system within the cork. Geotextiles are semi permeable fabrics that help separate soil layers but permit the passage of fluids. 

Irrigation System

For the climate we enjoy here in Porto an irrigation system is definitely not necessary. However in order to control the parameters of Neoturf’s experiment a system was installed. In the future we will build a rainwater harvesting system that will allow us to store and re-use rainwater for non potable purposes. Watch this space!

Cork Insulation

Cork
Cork grid

Laying the cork panels

The most cutting edge element of this design is the inclusion of cork insulation, thanks to a partnership with Neoturf, who conducted the research about this design. This is the first time this design and technology has been implemented on a green roof of this size so we are very excited and hopeful for the results. The expanded cork is a by-product of the industrial process for manufacturing wine corks and is being increasingly used in construction. We explain more about this carbon negative wonder material in a full article here. 

Cork is a carbon negative material as the trees it is harvested from absorb CO2 from the atmosphere as they grow. These cork boards provide insulation – with the thermal efficiency of Lambda 0.038-0.040 watts per meter kelvin or R3.6/inch.In cold months this is comparable to synthetic materials such as expanded polystyrene during warm weather synthetic insulation performs very poorly due to having low thermal mass [1].  Additionally, in order to allow water to drain a grid was pre-cut into the panels: vital to withstand Porto’s frequent downpours. By using this design and material we negate the need for synthetic insulation, plastic drainage cups, and other plastic liners. 

Substrates

The second experimental aspect of our green roof is being investigated in partnership with Neoturf, who specialise in landscape design and nature based solutions. The soil that is used on green roofs cannot be composed of simply hummus. It requires other gravels or materials that reduce compaction and promote effective drainage. Neoturf are investigating how well 3 different substrates that use recycled construction waste perform in contrast to the commercially available alternative. Should this research prove successful they will promote the widespread use of recycled waste as substrate across the industry. Over the next two years they will monitor the progress of the plants growing on our roof. 

Interview with Paolo Palha from Neoturf

Check out an in-depth interview with Paolo Palha, researcher and engineer from Neoturf, that gives us insights into the significance of his research and what they are expecting to find in the next couple of years, monitoring the plants’ growth:

Conclusion

This green roof represents three years of hard work, prototype development, and teamwork. Countless hands have helped repair walls, build structure, haul earth and the thousands of other tasks needed to realise this ambitious project. We send huge love and thanks to everyone who has helped in any way. This is a major milestone for us and we are excited to see our plants grow healthy and strong. Neoturf will continue with this research over the next two years, after which we can adapt the roof to grow our own food and reach a higher level of self-sustainability.


Are you interested in implementing an ecological green roof in your project? Critical Concrete can provide advice, design and construction services for the whole process: including structure, procurement and material sourcing. Contact our studio today!

Interested in using this technology in your project?

Critical Studio can help!

Learn More!

We need your support to continue researching and developing ecological, low tech solutions. Check out our patreon to see what perks we offer in return for helping us on our sustainable mission.

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Co-ops, Cohousing & co.

Co-ops, Cohousing & co.
Cooperative housing is discussed in one module of our Sustainable-Sustainable Architecture postgraduate course; if the topics discussed in this article pique your interest, you may be a wonderful candidate. Learn more here.

Living in a single-family unit, either in a house or apartment building has become the living standard, but it isn’t the only possibility. Many houses are equipped with appliances and rooms that are used rarely or on a weekly basis, which suggests that there may be a more functional system out there. On the other hand, many houses in urban settings are cramped and unhealthy due to the rising cost of living in cities and urban migration. This inequity is only growing with urban migration patterns and gentrification. 

The single-family housing model is not a viable paradigm for the future. Not only is it an inefficient use of space, but it is also isolating and fails to nurture community. It tends to be cramped for the poor and leaves vulnerable groups to fend for themselves. On a deeper level, these aspects are the exact opposite of what allowed early humans to create society.

Architects, theorists, and dreamers have all wondered how our dwellings can be reshaped for better quality of life and higher affordability, but to solve these issues, they don’t need to strive for the most complicated answer. Two possibilities already exist to challenge the housing paradigm. Housing cooperatives have existed for over a century and challenge the notion of housing as a commodity. Cohousing is a method of living with others to maximize space, resources, and community. These ideas have potential to not only remedy urban housing challenges, but also to home in on environmental sustainability in domestic spaces.


a basic comparison

Cooperative Housing

Housing cooperatives, or co-ops, have existed throughout history, yet in most places they are not recognized as mainstream housing possibilities. In fact, they’ve gone so far under the radar that you might be wondering what in the world a housing cooperative is. Let’s rewind.

A housing cooperative is a housing business which has shared ownership by its residents.[1] The goal of this collective ownership is affordability rather than profit.[2] Aside from collective ownership, there is one feature that is almost always present in coops: democratic processes.[3] Residents get to vote on the major decisions of the cooperative, such as who can replace a former resident, or whether solar panels should be purchased for the building. Other important elements of cooperative housing are commitment to social goals, security in community, decent housing, personal growth, and transparency in management.[4]

The modern history of housing cooperatives in Europe began in the 1800s in Berlin with Victor Aimé Huber’s cooperative dwellings.[5] The practice evolved and expanded, becoming an opportunity for decent affordable housing and as a possibility for people to have more control over their living conditions. 

File:Kalkbreite.jpg
Kalkbreite Cooperative Zurich (CC BY-SA 4.0)

Differences between Cooperatives

As the practice of founding co-ops spread and grew more prevalent, many differences arose. There are limited-equity coops, often for low and moderate income shareholders, market-value ownership coops, which do not require affordability; rental co-ops which have more secure tenure and have mixed-income tenants; and mutual aid co-ops which are based on solidarity and self help and are usually self-built.[6] Depending on the country and its policies, funding a new housing cooperative could rely on government, banks, or private investors. Cooperatives can be rural or urban, high rise or groups of single family housing.[7] Some co-ops began as ventures to create exclusive and wealthy multi-family housing whereas others were intended to create housing for the poor.

The most pronounced differences between cooperatives comes down to financing and legal constraints, both of which are influenced by the government where a cooperative is located. Cooperatives around the world vary subtly because of governmental constraints in their respective countries, so these are a few examples to show the possibilities.

In Austria, a country with a strong social housing sector, housing cooperatives which are below market-rate are exempt from corporation tax.[8] The government offers subsidies through public housing schemes via low-interest grants or mortgages that cover some of the construction costs.[9] In Egypt, cooperatives are exempt from many taxes, from industry profit taxes to custom taxes and importing fees, some fees including building license fees and publishing fees, and interest of deposits in banks.[10] They receive a 25% discount on state owned land which can be increased to 50%.[11] 

Portugal’s government reduces the VAT from 20% to 5% for cooperatives, and they also provide tax exemptions on land acquisitions and subsidize interest rates for cooperatives with low-income target groups.[12] Pakistan has a unique system for cooperative development: the state provides land to cooperatives, but cooperative shareholders are responsible for the construction of their residence on the plot they are assigned.[13] Interestingly enough, in Germany, although housing cooperatives do receive tax relief, they do not receive money from social housing funds; co-ops are not part of social housing there.[14]

The presence of housing cooperatives often hinges on politics. Since cooperatives greatly benefit from the aforementioned subsidies, tax relief, government loans, and other governmental support, proliferation of new co-ops can fluctuate with political changes. Furthermore, governments can incentivise cooperatives through policy, but they can also place limits on the founding of new cooperatives. For instance, Poland banned cooperatives in 1990, a marked difference from the years they had spent becoming mainstream during the socialist regime.[15] On the contrary, Portugal experienced an increase in co-ops after an authoritarian government which opposed the values of cooperatives was replaced.[16] In Pakistan, a corruption scandal from a cooperative paused registration of new housing cooperatives.[17]

Membership practices in cooperatives mean that even in rental cooperatives, residents are less passive inhabitants than in typical multi-family housing. Democratic foundations within cooperatives mean residents vote on management, changes, and governing structures. Each shareholder can have one vote, but in some co-ops the number of votes is equal to the number of shares. Some cooperatives require all decisions to be voted on by everyone, whereas others allow members the option of voting. Whichever way the voting system plays out, members of cooperatives have a stronger sense of ownership and participation, and can motivate one another to create a greener, healthier housing cooperative.


Student Cooperative in California via tsakett on Flickr

Cohousing

Cooperative housing shouldn’t be confused with cohousing, a modern iteration of intentional living developed in Denmark.[18] Cohousing can be implemented within cooperative housing; the two are separate systems which have potential to work together. Cohousing challenges the single family home in favor of sharing space and creating a stronger community.

Although the idea of living with others isn’t new, the term “cohousing” only arose in 1988 after two architects from the United States observed the phenomenon in Denmark, where it had gained traction.[19] Exactly twenty years prior, architect Jan Gudmand-Hoyer had spent several months discussing housing alternatives with a group of friends, developing plans for 12 houses gathered around a common space.[20] Although the project never took form, he published an influential article on the project entitled “The Missing Link between Utopia and the Dated One-Family House” which elicited responses from many families eager to live in such a situation.[21] Another article, “Children Should Have One Hundred Parents” by Bodil Graae, garnered further interest in the concept.[22] After the articles were published, families came together to purchase sites and construct two projects by 1973, which formed the blueprint for cohousing in Denmark.[23]


Rudolph Schindler House in Los Angeles via Lian Chang on Flickr (CC BY 2.0)

The ideas are far from new. While Gudmand-Hoyer and Graae were writing these articles, the hippie movement in the sixties was awash with communes and ideas challenging single-family living. But unlike cohousing, many hippie communes were infamous for being financially and socially unsustainable. Additionally, with roots in the early 1900’s, the intentional communities called kibbutz are well known examples shared living from Israel. In California, the Austrian architect Rudolph Schindler built one of the first ever modernist houses, designed for two families to live cooperatively and share one common kitchen.[24] All this is to say that cohousing is not a particularly unique idea, although its less radical stance is possibly what makes it such a viable housing option.

However, what differentiates cohousing from similar ideas like kibbutzim or ecovillages is that cohousing is primarily an architectural design which fosters community alongside a social agreement to live cooperatively. It does not have ideological connotations and can manifest in various ways. Cohousing can be rural or urban, meaning unlike other kinds of intentional communities, it can respond to the global urban influx. Additionally, cohousing may be equipped to handle the challenges of  urban living, such as elder- and childcare along with social isolation. Some cohousing situations share chores in common spaces such as cooking, which tends to free up time for those with busy schedules. 

Sustainability in Cohousing

Cohousing has some inherent advantages for sustainability. First, dense dwellings groups are more efficient to heat or cool. If the kitchen and living areas are shared, less furniture is needed and kitchen appliances only need to be purchased once for multiple families. By living in close proximity, people can share their skills, which means residents can help each other with tasks like repairing broken items instead of wasting them and buying new things. Additional benefits include purchasing food in bulk, which is better for transportation and uses less packaging. Shared garden spaces mean some food can also be cultivated in a community garden. Having a garden also provides a space to incorporate a compost bin, a challenging feature for typical urban housing.

Cohousing also has the benefit of community learning and social practices, which helps propagate care for the environment and ecological values.[25] By living with many people, there can be less car dependence. Tasks like grocery shopping can be divided and commuting to work can be done with fewer cars.[26] Finally, shared meals can result in lower food waste.[27]

File:Sonnenschiff in Freiburg-Vauban 7.jpg
Vauban Cohousing in Freiburg via Andreas Schwarzkopf (CC BY-SA 3.0)

Housing More Sustainably

There is potential for even more sustainability in cohousing projects. The fact that many cohousing projects are cooperatively owned, purchased before construction is complete, or even designed with input from the future residents is something that allows for even more ecological interventions. If cohousing projects are designed with sustainability in mind, they can be more energy efficient and prioritize passive sustainable strategies. For instance, common areas can incorporate daylighting and efficient ventilation. The design can include a root cellar to store vegetables for long periods in winter without the use of a fridge. Natural materials such as hempcrete, mycelium, cork, rammed earth and many more could all be used as building materials. Since some cohousing projects include aspects of self-building or auto-construction, materials and techniques are employed with easy repairability and designs that factor in longevity. Some features of sustainable design, like solar panels, come at a premium, but if a project is cooperatively owned, these additional costs are spread out among all the owners.

Occupant ownership via the housing cooperative model also means that there can be experimental sustainable practices that wouldn’t usually be possible in conventional multi-family housing. A garden could be designed to have a phytodepuration wastewater treatment system, which would simultaneously provide a beautiful marsh landscape in the common area. There could be compost toilets, green roofs, or food forests, too. With an ecological group of residents, there is also potential for the use and maintenance of a biodigester to produce biogas for cooking. The possibilities are endless, especially with lots of community minded people with various skills willing to contribute to communal projects.

Cohousing and cooperatives are two approaches to financial and ecological housing issues. They provide a peek into what housing would look like if we didn’t approach it from a single-family perspective. When the concepts are combined, they create feasible models for better living conditions, affordable housing, and stronger communities. Moving away from profit and towards collective action gives an added opportunity for a more ecological way of living. Existing cohousing cooperatives are great launch pads for pushing the possibilities of environmentally sustainable multi-family housing, while budding cohousing cooperatives have the opportunity to design healthy living spaces for both people and the planet. 

Footnotes

[1] https://4bfebv17goxj464grl4a02gz-wpengine.netdna-ssl.com/wp-content/uploads/drupal/Profiles%20of%20a%20movement%20final%20web%20ISBN.pdf

[2] Note: There are some cooperatives which are not intended to be affordable housing, but the collective ownership does improve the affordability, even in those cases.

[3] https://www.ica.coop/en/events/cooperative-housing-key-model-sustainable-housing-europe

[4]https://4bfebv17goxj464grl4a02gz-wpengine.netdna-ssl.com/wp-content/uploads/drupal/Profiles%20of%20a%20movement%20final%20web%20ISBN.pdf

[5] https://www.housingeurope.eu/event-183/cooperative-housing

[6] https://www.housinginternational.coop/sdgs-2/cooperative-housing-models/

[7] https://4bfebv17goxj464grl4a02gz-wpengine.netdna-ssl.com/wp-content/uploads/drupal/Profiles%20of%20a%20movement%20final%20web%20ISBN.pdf

[8] https://4bfebv17goxj464grl4a02gz-wpengine.netdna-ssl.com/wp-content/uploads/drupal/Profiles%20of%20a%20movement%20final%20web%20ISBN.pdf

[9] Ibid.

[10] Ibid.

[11] Ibid.

[12] Ibid.

[13] Ibid.

[14] Ibid.

[15] Ibid.

[16] Ibid.

[17] Ibid.

[18]  https://www.cohousing.ca/about-cohousing/history-of-cohousing/

[19] http://www.cohousingco.com/cohousing

[20] https://www.cohousing.ca/about-cohousing/history-of-cohousing/

[21] Ibid.

[22] Ibid.

[23] Ibid.

[24] https://www.archdaily.com/783384/ad-classics-kings-road-house-rudolf-schindler

[25] https://www.iberdrola.com/social-commitment/cohousing

[26]  https://www.moneycrashers.com/communal-living-cohousing-types-benefits-intentional-communities/

[27]  https://www.moneycrashers.com/communal-living-cohousing-types-benefits-intentional-communities/

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