Eps Insulation Under Concrete Slab

Eps insulation in an under slab application.

Eps insulation under concrete slab.

An overly conservative design approach often results in specification of a high compressive resistance xps product when a more cost effective eps. Eps 3 xps 2 faced or unfaced. Concrete 4 existing drywall 2. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department.

Say you use an average and relatively inexpensive rating of 40 psi then the insulation will support. Take the case of a warehouse with a 6 inch thick 2 500 psi concrete slab on 2 inches of eps insulation with a rated stiffness of 360 psi for one inch. Get free shipping on qualified eps under slab foam board insulation or buy online pick up in store today in the building materials department. Forklifts to be used in the building impart 8 000 pounds of force at the wheel which has a 6 inch by 10 inch tire footprint on the slab.

Historically used as a stable roof insulation eps has gained wide acceptance in wall below grade and under slab applications due to its low moisture absorption strength and stable long term thermal performance. Eps insulation blocks can be custom cut into a variety of shapes and sizes to meet wide ranging job specifications. Cement 3 concrete 3 existing drywall 2 plywood 3 wood 2 sheathing type. When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost.

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. Formaldehyde free 3 structural 2 vapor retardant 2 insulation r value. Under slab insulation up site admin 2020 07 16t01 50 20 00 00 a durable and energy efficient solution for insulation applications and the ideal material to stop energy loss at the foundation slab. Eps offers a number of advantages over the more commonly installed xps including having the highest r value per dollar among rigid insulations.

Eps 3 xps 2 faced or unfaced. Xps and eps rigid insulation is used under concrete slabs. As insulation becomes increasingly common on foundations and under slabs understanding the performance and cost factors of the different materials is important for successful bids and profitability. They both come in various rated compressive strengths from 10 psi to about 80 psi.

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. Yet concrete slabs distribute loads more uniformly than this which means the insulation does not need as high of a compressive resistance as when one assumes a concentrated triangular load path.