{"id":5124,"date":"2025-03-03T17:08:30","date_gmt":"2025-03-03T22:08:30","guid":{"rendered":"https:\/\/maisonenchanvre.com\/?p=5124"},"modified":"2025-04-03T09:00:18","modified_gmt":"2025-04-03T14:00:18","slug":"innovation-walls-and-foundations-made-from-sprayed-hemp-lime-concrete","status":"publish","type":"post","link":"https:\/\/maisonenchanvre.com\/en\/innovation-walls-and-foundations-made-from-sprayed-hemp-lime-concrete\/","title":{"rendered":"Innovation: Walls and foundations made from sprayed hemp-lime concrete"},"content":{"rendered":"\t\t
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Back to Press release<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Innovation: Walls and foundations made from sprayed hemp-lime concrete<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\u2014 La Maison du 21e Si\u00e8cle<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\tFor \u00c9milie Lemay B\u00e9lisle, using polyurethane on her foundation was out of the question. \u201cThe primary idea was to use healthy materials for the kids, who would be spending a lot of time there,\u201d says the Laval resident. Jean-S\u00e9bastien Matte and his partner Gaelle Fedida, from Rosemont\u2013La-Petite-Patrie, also wanted \u201cthe most eco-friendly renovation possible.\u201d Both had the opportunity to be among the first Quebecers to test a sprayed hemp-lime concrete mix applied using a pneumatic sprayer, offered by partner company HECO Innovation, which develops innovative solutions using this healthy and eco-friendly material already widespread in Europe.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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HECO (Hemp Engineering Carbon Zero) was founded last May by two engineering graduates from \u00c9cole de technologie sup\u00e9rieure, Philippe Fortin and Maxime Saint-Pierre. They plan to bring sprayed hemp-lime concrete to market this fall and will launch their flagship product this spring: prefabricated wall panels or blocks made from lime-bonded concrete and hemp insulation. \u201cSince hempcrete takes up to two months to dry (about one inch per week), prefabrication will limit drying time on-site,\u201d explained Philippe Fortin in a phone interview.<\/p>

Hemp and lime are eco-materials particularly suited for foundation insulation<\/a> because they allow water vapor to pass through, letting damp walls dry, he added.<\/p>

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A durable concrete<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\u201cThe goal is to avoid trapping moisture in the wall like polyurethane does, which doesn\u2019t let it escape. Moisture from the soil that builds up in the wall won\u2019t be able to dry. And if there\u2019s a risk of freezing at night, [as water expands when it freezes], cracks will form and lead to early foundation degradation. Concrete can\u2019t manage liquid water the way gutters, sloped terrain, foundation drains, or waterproof membranes do\u2014those are ideal when dealing with clay-heavy soil that retains moisture,\u201d explains this researcher, who will complete his master\u2019s degree on hemp-lime concrete in 2022.\n\nThis eco-concrete insulates three times less than polyurethane\u2014R-2 vs R-6 per inch of thickness\u2014Philippe acknowledges, but it has undeniable benefits. First, it provides solid comfort thanks to the thermal mass of lime, which is derived from limestone. \u201cHemp and lime offer an excellent balance between insulation and thermal mass,\u201d says Philippe.\n\nAdditionally, lime is fire-resistant and antifungal due to its high alkalinity\u2014it\u2019s even caustic. That\u2019s why workers must wear gloves and protective clothing. Polyurethane, on the other hand, has no thermal mass to store heat or cold. It\u2019s a petrochemical polymer created by reacting alcohols with isocyanates, which are known triggers of occupational asthma. Moreover, polyurethane must be treated with fire retardants because it\u2019s flammable and provides no thermal mass.\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The qualities of hemp<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hemp is a bio-based material with a high saturation point, meaning it can absorb a large amount of water relative to its weight before dripping, Philippe adds. \u201cIt\u2019s like a sponge, unlike mineral wool, which must be kept from condensing moisture. Breathable materials like hemp and lime prevent condensation by continually absorbing and releasing humidity. Thanks to its water retention, hemp reduces the humidex factor in a building, which also adds to comfort. Its hygrothermal qualities [the interaction of temperature and humidity in indoor air] have a big impact on how heat feels in summer: it\u2019s not stuffy, and you don\u2019t need air conditioning, which contributes to global warming due to refrigerant gas leaks.\u201d<\/p>

HECO Innovation uses the Belgian-formulated lime product Tradical, which includes hydrated lime and a bit of clay to help release humidity while offering strong compressive strength. \u201cIn two years, we hope to release our own version made with local materials.\u201d Sprayed hemp-lime concrete costs between $2 and $3 per square foot per inch of thickness, depending on the complexity of the application\u2014for example, in a hard-to-access crawlspace. \u201cIt\u2019s complicated\u2014you have to control the spray with 240-volt machines. We also hope to eventually build our own equipment.\u201d<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The Laval construction site<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\u00c9milie Lemay B\u00e9lisle and her husband, Christian Casilimas, own a home built in 1928 with a basement floor about 28 by 28 feet and only 4 feet 10 inches of headroom under the beams\u20145 feet 2 inches between them.<\/p>

\u201cWe chose to use the space for storage, the laundry room that was already there, but especially as a play area for the kids,\u201d explains \u00c9milie. Water was seeping through the walls, which are partly made of fieldstone. The work was done last summer, but due to lack of time, a waterproofing membrane will be applied from the outside this year.<\/p>

\u201cWe decided to spray two inches of hempcrete onto a small inner wall built against the three dampest foundation walls. The upper parts of the walls were insulated with hemp wool, which is cheaper. We built the wooden framing ourselves, which was then filled with sprayed hempcrete and hemp wool.\u201d<\/p>

\u201cAt NovEnviro, we recommend putting a breathable Salola membrane on the foundation before adding batt insulation or hempcrete,\u201d notes Nicolas S\u00e9guin, VP and cofounder of the eco-materials distributor.<\/p>

The hemp wool, the hemp-lime concrete, and its application cost around $8,500. After spraying, the rough finish needs to be smoothed out with a hand-troweled finishing coat of hemp-lime plaster. That cost a little over $2,000, including labor.<\/p>

\u201cWe know we went with lesser-known materials and a technique that\u2019s still developing, but we\u2019re happy with our choice\u2014it\u2019s healthy and eco-friendly and aligns with the vision we had,\u201d concludes \u00c9milie.<\/p>

Jean-S\u00e9bastien Matte and Gaelle Fedida own a 3,000 sq. ft. Montreal home built around the same time, in 1930. The former duplex was converted into a single-family house with two basement studios totaling 1,000 sq. ft. When their tenants left, Jean-S\u00e9bastien opened up the walls and discovered a damaged rubble foundation on a cement base. He cleaned everything, waterproofed it, and even installed a French drain.<\/p>

He also chose hempcrete for its eco-friendly and aesthetic qualities. \u201cDrywall didn\u2019t really appeal to me. It\u2019s ugly\u2014it lacks character and life. I only used it for the ceiling.\u201d<\/p>

He had three walls insulated; the fourth had already been done during a previous renovation. It took four days to spray 4 inches of hempcrete on two walls and 2 inches on a shared wall. The total cost was about $14,000, not including finishing, and it took two months to dry. Jean-S\u00e9bastien estimates polyurethane insulation finished with drywall would have cost less than $8,000.<\/p>

He\u2019s finishing the walls during his spare time. Gabriel Gauthier, owner of Artcan \u2013 Hemp houses<\/a>, a Quebec pioneer of this eco-material since 2010, supplied him with 32 buckets of premixed hemp-lime plaster. \u201cYou have to smooth, smooth, smooth and go over it again and again!\u201d he says. \u201cBut the result is very satisfying. It creates a warm ambiance and great sound insulation. You feel wrapped in it\u2014everything is well sealed around doors and windows.\u201d<\/p>

Craftsman Gabriel Gauthier explains: \u201cWe recommend using membranes and even an air gap between the concrete wall and hemp wool insulation. That can also be done with hempcrete. That said, applying hempcrete directly to the interior of stone or concrete foundation walls gives impeccable results that speak for themselves. It\u2019s because the material is highly mineral and limestone-based. Only direct water infiltration can affect its appearance. So personally, I\u2019m not worried about capillary action with well-mixed hemp-lime plaster applied to interior foundation walls.\u201d<\/p>

The space features a radiant floor heated by a pellet boiler from Austrian giant \u00d6koFEN, the Pellematic 20 model from Maine Energy Systems. Certified by the U.S. Environmental Protection Agency (EPA) for fine particle emissions, the system cost $20,000 but consumes less than $3,000 in pellets per year\u2014compared to $6,000 in heating oil per winter before. The slab is insulated with polystyrene: \u201cHemp isn\u2019t recommended for floors,\u201d notes Jean-S\u00e9bastien Matte.<\/p>

A winemaker and cider maker, he\u2019s very proud of his basement. \u201cThis work is done for the next hundred years. Maintenance and repairs are easy, and it regulates humidity, temperature, and sound. It\u2019s a win on all fronts.\u201d<\/p>

And even when it comes to suppliers. \u201cDEUXMAX [NovEnviro] are good people\u2014but there\u2019s no competition to drive prices down. Hemp costs twice as much as mineral wool. The only good law Donald Trump ever passed was the one legalizing industrial hemp cultivation. I\u2019m hopeful it\u2019ll open up the market!\u201d<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Read the original article<\/a><\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Back to Press release Innovation: Walls and foundations made from sprayed hemp-lime concrete \u2014 La Maison du 21e Si\u00e8cle For \u00c9milie Lemay B\u00e9lisle, using polyurethane on her foundation was out of the question. \u201cThe primary idea was to use healthy materials for the kids, who would be spending a lot of time there,\u201d says the […]<\/p>\n","protected":false},"author":1,"featured_media":4709,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-5124","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-release"],"yoast_head":"\nInnovation: Walls and foundations made from sprayed hemp-lime concrete – Artcan<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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