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"Raft slab"

Raft slab / Discussions

  • 19 - 36 of 45 Posts

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

Can tubing for a ground source heat pump be put under a slab on grade prefab form foundation kit to extract winter heat? We generally recommend people check wit...

Posted by Jennifer Cole Aug. 28, 2019 Slab on Grade 1 response

How well do Legalett slab on grade floor forms work?

...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 slabs? Th...

Posted by Steve Sykes Aug. 18, 2019 Slab on Grade 3 responses

Is a vapor barrier necessary under a concrete slab with foam insulation and if so, where does 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 Grady 22 Aug. 17, 2019 Air and vapour barriers 3 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 Foundations and Basements 1 response

Can you elevate a slab on grade foundation?

...raft slab distributes the weight evenly over the entire surface of the floor so we were able to build on the existing clay.   If you are looking to get near Pas...

Posted by Raoul Lions July 27, 2019 Slab on Grade 4 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 Mechanical systems 1 response

Can you help me choose between a slab on grade and 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 Slab on Grade 1 response

Would you recommend Legalett over water 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-on-grad...

Posted by Christine Pountney May 2, 2019 Delivery: radiant, forced-air and decentralized 1 response

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

...slab on grade kit here as well as the radiant tubing. 

Posted by dean c April 30, 2019 Solar thermal collectors 2 responses

Do I need to insulate 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 Slab on Grade 1 response

What are the factors I should consider for choosing between a slab on grade and basement?

...slabs for your interest. Don’t hesitate to write back with more concerns, we love slabs and are happy to keep the discussion going.  Best practices for insulat...

Posted by Shaun B April 2, 2019 Slab on Grade 3 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 Where is the house, and do you know how...

Posted by terry northcott March 25, 2019 Slab on Grade 1 response

Can you add a screen/sun room and deck to a slab on grade?

...slab but a company that supplies prefab slab on grade kits (Legalett) can easily provide that, see more here –  Slab-on-Grade Raft Foundation Insulation Detail,...

Posted by Pierre Contant July 1, 2020 Slab on Grade 2 responses

How do you choose between a basement or slab on grade?

...raft slabs which are engineered to spread the weight evenly, so the are much more solid and not prone to structural cracking like standard concrete slab floors....

Posted by A. Delmas May 21, 2020 Foundation choices 1 response

Protection from Insects for Legalett Geo-passive super insulated slab on grade?

...slab is the possibility of insects, especially termites and/or carpenter ants infesting the EPS. Is that a danger? Among the many possible ways to protect again...

Posted by James Burns April 30, 2020 Slab on Grade

How well does the Legalett air heated floor work when pouring concrete?

...Slab on Grade for LEED, Passive, ZNE Legalett monitors the process of installion for their raft slab kits, which includes a pre-pour inspection for warranty, th...

Posted by Israel Sword March 28, 2020 Slab on Grade 1 response

Should I build a basement or slab on grade?

...slab on grade mainly because of familiarity. Most don’t know how to build a slab on grade so they tend to steer you way from them simply for lack of knowledge a...

Posted by robert baker March 27, 2020 New foundations and slab-on-grade 10 responses

Do you have an engineer directory for slab on grade designers?

...slab, but the one lead I can give you would be Legalett that provides raft slabs across all North America. They deliver all over North America, and their kits c...

Posted by Paul Giusto Dec. 30, 2019 Slab on Grade 1 response
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