Raft slab / Discussions

...slab, the heated air is diverted to an air/water heat exchanger for heating the hot water tank instead. Is the closed loop system maintained when diverting heat to the air/water heat exchanger for the water tank? I look forward to reading about the effectiveness of this Solar Air Panel tie in to the Legalett system onc...

...slab. As my basement is below the frost line, I’m not sure if insulation is necessary, but want to know what the experts think. If insulation is required, how much and what type is recommended? You absolutely need to install insulation under a slab, you would be utterly miserable if you didn’t, you would have frozen fe...

...slab on grade prefab form foundation kit to extract winter heat? We generally recommend people check with an engineer for any such matters, but that shouldn't be a problem at all. Installing tubing for a ground source heat pump (GSHP) under slab on grade foundations as well as ground loops for HRVs and ERVs, can be a a...

...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? There are about a million and a half square feet of Legalett slabs installed all over North America and there is not a single structural failure recorded - the sy...

...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 from the south facing windows in winter, avoiding having to put too much heat in to keep stuff from freezing. There's a bed of compacted gravel already down for th...

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

...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 Passive House performance with you home then you may want to look into such a kit, below is an image of a Passive House slab under construction with 14 inches of s...

...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? Would it make sense to run a house wide plenum for the ERV alone? And if that's the case, would it be more efficient to hook the heat pump in to the ducting, rathe...

...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 that. A slab on grade floor consists of concrete and insulation (radiant heating tubes, mesh and rebar of course) but not wood. A wooden structure would sit on t...

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

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

...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. The best way to ensure that a FPSF (Frost-protected shallow foundation or slab-on-grade) doesn’t heave would be to have it modelled for your specific climate by a...

...slab, here is a video of the install if you want to have a peek. It is entirely above grade, and as I write, the house on top is being built, which will be insulated with cellulose (recycled news print). Here are some other pages on slabs for your interest. Don’t hesitate to write back with more concerns, we love slab...

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 old it is? Those two things would offer a first indication of how well it is insulated, depending on what the Building Code requirements were in that location ...

...slab to the one below. Thanks, Keri   There are many ways to build a slab on grade foundation on sloped building lots, but doing three separate slabs isn’t necessarily the cheapest option. Did you specifically want a 3 level house or is that something you have chosen simply to adapt to the terrain? I ask this because i...

...slab on grade prefab kit? If so, see this page on Legalett Geoslab foundation kits and air heated floors and you can contact them through there. If that's not what you mean let us know but I can't think of any other system you'd be referring to.

...raft slab / slab on grade shallow foundation and and ICF block wall. But I think building the slab on grade would be more simple than you think, you can read more here if you haven’t already found this page- Raft slabs – how to build a slab on grade or basement on problem soils A raft slab is engineered to spread the ...

...slab, you just need to be sure to insulate between the heated and unheated portions. This is not the easiest thing to accomplish with a hand made 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, Prefab ICF Fo...