Best Insulation Under Concrete Slab

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

Best insulation under concrete slab.

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. If you want to save money you can install a 4 ft wide band of horizontal r 10 or higher insulation at the perimeter of the slab in a picture frame configuration. Home depot does sell the right solution for residential concrete slab insulation. Foamular 250 foam board.

The insulation is then laid followed by a polythene separating layer and either a concrete screed or tongue and groove chipboard ready to receive the specified floor finish. R 10 scored squared edge. Best seller owens corning foamular 250 2 in. Under slab 5 more ways to filter.

This slab insulation is 0 2 inch 5mm closed cell polyethylene foam covered on one side with reinforced foil facing. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss. Exterior concrete slab insulation options it is good practice to insulate concrete slabs in cold climates to protect the slab from frost penetration. There are a number of different factors at play but the one thing that we always need to keep in mind is heat flow.

Cement 3 concrete 4 existing drywall 2. Their researchers found that xps insulation installed below grade for 15 years had absorbed 67 percent or more moisture. Prodex total under concrete insulation is ideal for concrete slabs radiant floors and driveways. Builders with a bigger budget especially those in cold climates should consider installing continuous horizontal insulation under the entire slab.

Target an appropriate compressive strength. When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost. Heat flows from hot to cold and in the. Lightweight rigid polyisocyanurate pir foam insulation boards such as those manufactured by celotex are among the most thermally efficient commonly available insulation materials.

Prodex exhibits less than 9 compression in thickness when subjected to loads associated with standard concrete floor systems. Foamular does not absorb water like other types of foam board which makes it ideal for below grade and under slab installations. 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.