Concrete Slab Over Foam Insulation

Of the slab s total heat loss certainteed effect of slab edge insulation rem design simulations 8 increase in total heating consumption with no slab edge insulation 62 of heat loss through slab edge 16 insulation located below grade shall be extended the distance provided in table 402 1 1. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. I wouldn t go as far as saying you couldn t use spray foam below a slab but i m not sure why you d want to.

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There are several ways to install subflooring above the rigid foam.

Concrete slab over foam insulation.

I have quite a bit left over and thought i could use it to insulate my concrete floors. Demilec a company located in texas has invented a type of insulation foam that can help all of the cracks and uneven pavement problems. I was a little concerned about the way any potential moisture might affect the fiber facing. If your basement slab lacks sub slab foam you ll have to install the insulation above the slab.

They both come in various rated compressive strengths from 10 psi to about 80 psi. I purchased a large quantity of recycled fiber faced polyiso for my exterior insulation retrofit. You can use either one or two layers of plywood or osb and the subflooring can either be fastened to the concrete with long tapcon screws or it can simply float above the foam. Xps and eps rigid insulation is used under concrete slabs.

In cold climates climate zones 4 and higher it s important to install vertical insulation on the interior side of the stemwall all the way down to the footing. Many builders bevel the top of the vertical insulation so that none of the rigid foam is visible after the concrete slab is placed. R 5 78 rigid foam insulation model 320817 14 68. Say you use an average and relatively inexpensive rating of 40 psi then the insulation will support.

Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place. 40 psi x 8 wide tire x 12 long tire print 3 840 lbs. Eps 3 xps 2 faced or unfaced. Geolift works for driveways sidewalks patios garage floors even pool decks.

When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost. The foil within the product acts to spread out the heat signature of the heating coils. The house is built slab on grade. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type.

Geolift can help to lift existing concrete surfaces and fix those problem areas around your house with much less labor. The reflectix concrete slab insulation is an innovative easy to handle product that increases the energy efficiency of radiant floor and snow melt systems under concrete.

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