Heave / Discussions

Have you excavated under one of your slabs middle of winter?

...heave - All About Frost Heave Prevention in Cold Climates Our last slab was built on a Legalett frost protected slab on grade , and Legalett has installed t...

Posted by Mike Kolder Jan. 31, 2021, 2:31 p.m. Slab on Grade 1 Responses

What is the best method of building a slab on grade?

...heave, crack, etc. Also, do you have a list of foundation contractors who have experience with building these slabs? Having built several LEED certified High pe...

Posted by Jay Law April 19, 2021, 3:09 p.m. Slab on Grade 1 Responses

What is the ground temperature 4 feet down in Sudbury, Ontario?

Hi, how can I know the lowest ground temp in the Sudbury latitude up as far as temiskaming latitude? Ideally at various depths. Thanks for being there, Paul

Posted by Paul Bullock Oct. 8, 2020, 4:53 p.m. Concept and design 0 Responses

Can you leave a Legalett slab in winter in Canada without the heat on?

...heave, as is often the case with detached garages. As for the heat source (air or hydronic), that has no impact on frost heave, nor is there any impact betwee...

Posted by Gamog Cladhaire April 29, 2021, 9:06 a.m. Slab on Grade 3 Responses

Do I need to insulate under the footings of a frost protected shallow foundation?

...heave, and that the more you insulate, the less heat will escape, increasing the risk of damage. And the way to mitigate that risk is to install a perimeter ski...

Posted by Jon Piana April 15, 2019, 8:45 a.m. Slab on Grade 1 Responses

Can you install a slab on grade foundation in the Fall and leave it over winter?

...heaves. We are also planning to polish and finish the concrete flooring as our finished floor so keeping it in good condition o finish is important. Thanks fo...

Posted by Matthew Gioia Sept. 21, 2020, 9:15 p.m. Slab on Grade 1 Responses

How do you build a mold-free basement in a new construction house?

...heave. The way they have done the outside seems fine, with a drainage membrane and backfill, so any issues would be on the interior. Before we move on to dryw...

Posted by Charmaine Herzig Feb. 10, 2020, 7:32 p.m. Basements improvements 3 Responses

How do you fix ice dams and crawl space insulation in historic homes?

...heave and how to prevent it in order to do it safely. I had to deal with ice damming this winter. The simple answer is you are heating your roof. Most likely yo...

Posted by Faith K Feb. 26, 2021, 1:43 p.m. Roof assemblies - renovation 2 Responses

What thickness of insulation and concrete do you recommend in a floating slab?

...heave it's the best value for money you can have in a build. And, personally, I would never consider anything under 4 inches of reinforced concrete for a slab o...

Posted by Marc-Andre Roy April 21, 2021, 7:38 a.m. Slab on Grade 3 Responses

What's the best way to seal a crawl space and insulate?

...heave and how to prevent it. Last point, on humidity -get a hygrometer (moisture meter) and see what the levels are in the crawlspace. It's best kept below 50...

Posted by Steven Johnston Feb. 23, 2021, 12:35 p.m. Crawl spaces 1 Responses

Could we use a raft slab with ICF walls on a sloped site?

...heave. So what you may be able to do, is dig out the portion of the hill that would be the back wall, create a level flat surface that big enough for the foot...

Posted by Paul Fischer Sept. 15, 2020, 2:21 p.m. Slab on Grade 1 Responses

What is the best way to insulate a crawlspace to keep humidity down and stop odors?

...heave and how to prevent it And about venting crawlspaces, that can be a problem depending on where you live. The foundation walls will be cool in summer, s...

Posted by Dave Bell Oct. 24, 2019, 3:57 p.m. Crawl spaces 3 Responses

Can you help me decide between a foundation, slab on grade and crawlspace?

...heave, shifting or cracking, and to make sure that the soil conditions are appropriate for a slab Make sure to install a sufficient amount of insulation to av...

Posted by David Davenport Nov. 26, 2018, 12:57 a.m. New foundations and slab-on-grade 1 Responses

Would you recommend Legalett over water radiant floor heat for a backyard studio in Toronto?

...heave, but typically a designer or engineer that doesn’t specialize in soils will insist on one regardless. It can be an unnecessary cost, but it does no harm a...

Posted by Christine Pountney May 2, 2019, 1:22 p.m. Delivery: radiant, forced-air and decentralized 1 Responses

How do you create a slab on grade on a slope?

...heave, and install drains in the patio linked to the perimeter drain to keep everything dry during those wet spring-times in Pennsylvania. Whether an engineer...

Posted by Adrienne Rayna June 30, 2020, 3:58 p.m. New foundations and slab-on-grade 3 Responses

What are the foundation options for a prefab house?

...heave would likely be about perfect. Our last LEED Platinum Demo house is on a slab on grade with a base of 6 inches of EPS foam insulation, which is also a sen...

Posted by Richard Bowie Nov. 20, 2020, 3:40 p.m. Foundations and Basements 2 Responses

How do you improve an old block foundation with no insulation or exterior moisture barrier?

...heave and how to prevent it when buildilng basements . But you should absolutely get a dehumidifier back operating as soon as you can or it will soon start to s...

Posted by Wilhelmina Lange March 11, 2021, 4:19 p.m. Foundation and basement improvements 2 Responses