Rigid Foam Insulation Under Concrete Slab

Xps and eps rigid insulation is used under concrete slabs. Say you use an average and relatively inexpensive rating of 40 psi then the insulation will support. Understanding rigid foam insulation for foundation and under slab applications.

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Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications.

Rigid foam insulation under concrete slab.

Contractors are increasingly called upon to install rigid foam insulation under concrete slabs and on building foundations. 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 7 7 rigid foam insulation model 310891 18 35 18 35. 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. It will reduce summertime condensation and mold accumulation and will therefore help your basement smell better. 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. 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.

A careful evaluation of these materials performance attributes against the project s needs can dramatically shrink labor and material costs. Below grade under slab system with foamular rigid board insulation. Owens corning enclosure solutions. 40 psi x 8 wide tire x 12 long tire print 3 840 lbs.

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. 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. 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. Concrete 4 existing drywall 2 plywood 5 wood 3 sheathing type.

They both come in various rated compressive strengths from 10 psi to about 80 psi. Eps 3 xps 2 faced or unfaced. 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. Even though the rigid foam won t save enough energy to justify its cost it s worth installing for another reason.

Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place. 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.

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