Rigid Foam Insulation Under Concrete Slab

Xps and eps rigid insulation is used under concrete slabs. Understanding rigid foam insulation for foundation and under slab applications. A common design assumption leads to specification of rigid foam strengths that are many orders of magnitude higher than necessary which can double the insulation material cost.

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One of the best ways to save money on rigid foam insulation installed under concrete slabs is to ensure the material is not over engineered.

Rigid foam insulation under concrete slab.

When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications. Contractors are increasingly called upon to install rigid foam insulation under concrete slabs and on building foundations.

For installation on concrete foundations and under floor slabs the rigid foam insulation you choose can make a difference of tens of thousands of dollars on a project. R 7 7 rigid foam insulation model 310891 18 35 18 35. Up to one quarter of a building s energy loss is due to lack of insulation in below grade areas including the foundation and under slabs. If you re building a new cold climate home with a basement you ll probably want to install a continuous horizontal layer of rigid foam under the basement slab.

Even though the rigid foam won t save enough energy to justify its cost it s worth installing for another reason. Eps 3 xps 2 faced or unfaced. Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place. They both come in various rated compressive strengths from 10 psi to about 80 psi.

Say you use an average and relatively inexpensive rating of 40 psi then the insulation will support. Owens corning enclosure solutions. 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. 40 psi x 8 wide tire x 12 long tire print 3 840 lbs.

Many builders bevel the top of the vertical insulation so that none of the rigid foam is visible after the concrete slab is placed. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type. Below grade under slab system with foamular rigid board insulation. 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.

It will reduce summertime condensation and mold accumulation and will therefore help your basement smell better. A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs.

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