Raft slab / Posts

Can you install tubing under a slab on grade foundation to extract heat in winter?

...slab slab on grade foundation to extract winter heat Hi Jennifer We generally recommend people check with an engineer for any such matters, but that shouldn't...

Posted by Jennifer Cole Aug. 28, 2019, 11:34 a.m. Slab on Grade 1 Responses

Can you elevate a slab on grade foundation?

...raft slab from Legalett . We chose that partly for performance, but also because the house is seated on expansive soils, so a frost wall and footing would have ...

Posted by Raoul Lions July 27, 2019, 2:47 p.m. Slab on Grade 1 Responses

Where would I go for guidance on structural design of footings that sit on top of high-density insulation?

...slab form kit - (see details here)

Posted by Douglas Bennion July 31, 2019, 4:34 p.m. Foundations and Basements 1 Responses

Does insulating a slab on grade make the building less stable?

...slab (thickened-edge footing) It would typically be high-density EPS foam, but a raft slab (which distributes the weight evenly over the entire floor) doesn’t e...

Posted by Nicolas Jalbert May 28, 2018, 4:56 p.m. Slab on Grade 1 Responses

What should I look for if I want to buy a slab on grade house?

I'm looking to buy a house build on a slab-on-grade . What should I be looking for in terms of insulation? Thanks, Terry Hi Terry, Where is the house, and do...

Posted by terry northcott March 25, 2019, 11:02 a.m. Slab on Grade 1 Responses

Slab-on-grade instead of Pressure treated wood foundation

...slab-on-grade is an alternative to a basement, PWF or concrete, so I'm not sure where you're being advised to mix a PWF and a slab on grade, or how to even do t...

Posted by Margot Simonot May 20, 2019, midnight Slab on Grade 1 Responses

Are there any updates on the progress of the second demonstration house?

...slab on grade kit here as well as the radiant tubing. Watch for more on the Wakefield House coming soon! Best regards, Mike Thanks for the reply. I noticed this...

Posted by dean c April 30, 2019, 7:58 p.m. Solar thermal collectors 2 Responses

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

...slabs. Legalett Solar Air Heated Slab on Grade installation video Slab on Grade Prefabricated Insulation Form Kit Air heated floor Thickened-edge slab...

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

Why do you say building on a slab is more ecological than starting with a basement?

...slab floor, offering a reliable very comfortable heat source. Cost savings: A slab foundation can be a cheaper way to build because a slab requires less wor...

Posted by Anonymous Dec. 11, 2017, 11:45 a.m. Foundations and Basements 1 Responses

Insulating under the footings of a frost protected shallow foundation

...slab to ensure durability: The AFI (air freeze index), how much insulation encases the slab, the soil conditions, and whether or not the slab will be heated. Th...

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

Current info and references for Legalett Air Heated Shallow Foundation system

...raft slab using Legalett ICF slab forms. 2) How are those issues usually addressed? What issues?! :) 3) What is the long term track record of Legalett sla...

Posted by Steve Sykes Aug. 18, 2019, 3:21 p.m. Slab on Grade 1 Responses

What is your opinion about building a garage on posts (screw piles)?

...slab floor (a raft-slab is also an option for softer soils) . The disadvantages of screw pile construction: A floor raised on screw piles leaves an addition...

Posted by Anonymous Dec. 11, 2017, 2:21 p.m. Foundations and Basements 1 Responses

Is a vapor barrier necessary under a concrete slab with foam insulation and if so, where does the plastic vapor barrier go??

...slab on grade foundation for our new cabin in Montana and I've decided to sit it on a 4" EPS foam insulation so the slab will retain some passive solar heat fro...

Posted by Les Poldark Aug. 17, 2019, 12:19 p.m. Air and vapour barriers 3 Responses

How much insulation if any should I install underneath my concrete slab in my basement

...slab is cooler than your slab (which it would be by about 15 degrees Celsius in your case) you will be feeding heat into the ground. Your basement should be d...

Posted by Scott Antonation Sept. 27, 2019, 1:06 a.m. Slab on Grade 3 Responses

Considering a slab on grade vs a basement

...slabs with wooden forms since it is engineered as a raft slab, but if you have a high water table, soil with lower compressive strength or expansive soil (like ...

Posted by Shaun B April 2, 2019, 6:35 a.m. Slab on Grade 3 Responses

What is the optimal setup for mechanical systems for slab on grade?

...slab on grade home. I definitely want a hydronic in floor heat system, along with a heat pump. With the absence of central ductwork, where do I put the ERV? Wou...

Posted by Dave Nuttall July 6, 2019, 9:42 a.m. Mechanical systems 1 Responses
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