Rigid Insulation For Slab On Grade

An easy way to recognize eps on the jobsite is that it is commonly white.

Rigid insulation for slab on grade.

R 7 7 rigid foam insulation model 310891 18 35 18 35. Below grade to have r 10 vertical insulation at the slab perimeter extending downward from the top of the slab to a depth of at least 2 ft. The f factors for slab on grade floors are defined in standard 90 1. While standard building codes typically require insulating value ranging from r 10 to r 15 detailing around the perimeter is generally weak.

Two common rigid foam insulations specified for below grade applications are expanded polystyrene eps and extruded polystyrene xps. Slab on grade floors with a floor surface less than 12 inches below grade should be insulated in accordance with information provided in the insulation and fenestration requirements by component table which is reproduced following this paragraph. Water resistant rigid board for under concrete slab insulation and slab support in traffic bearing applications. Rigid insulation is placed vertically on the exterior face of the foundation wall.

Spray foam for sure has uses where it is the best choice by a long shot but under a slab is not the place. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. Figure 4 11 illustrates a slab on grade foundation with a masonry foundation wall. These f factors are acceptable for all slab on grade floors but you need to make sure.

Moisture control is provided by a vapor retarder under the slab. Continuous insulation is defined in 90 1 as insulation that is continuous across all structural members without thermal bridges other than fasteners and service. Set your store to see local availability add to cart. Below grade under slab with foamular xps insulation.

2015 iecc irc section r402 2 10 n1102 2 10 slab on grade floors. If the slab has hydronic tubing the minimum r value of this insulation increases to r 15. This may leave a significant thermal. It also discusses installation procedures for below grade and under slab insulation.

In climate zones 4 and 5 the code requires certain slabs below grade slabs that are less than 12 in. This insulation aligns with rigid foam sheathing that covers the framed walls above grade. When building a slab on grade eps rigid foam insulation is the most common choice of insulation for performance and cost. Consult appendix a table a6 3 1 in the 2016 edition for a tabulation of assembly f factors for slab on grade floors based on the arrangement and rated r value of the applied insulation.

Insulating a slab on grade can be expensive.