Insulation Under Slab On Grade

Insulating properly below grade can help prevent total structure heat loss and reduce heating and cooling bills by 10.

Insulation under slab on grade.

The f factors for slab on grade floors are defined in standard 90 1. Below grade under slab system with foamular extruded polystyrene rigid board insulation and radiant heating. Slab is one foot or less below grade r 10 insulation required extending 2 feet below grade for climate zones 4 and 5 4 feet below grade for climate zone 6 insulation should extend downward from the top of the slab with two options to reduce slab edge insulation r value exterior slab insulation must be protected 46. Lack of foundation insulation on below grade and under slab projects can account for up to 25 of a structure s total heat loss.

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. Get all the construction documentation you ll need in a single click. Get all the construction documentation you ll need in a single click. These f factors are acceptable for all slab on grade floors but you need to make sure.

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. Get free shipping on qualified under slab foam board insulation or buy online pick up in store today in the building materials department. 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. Specify this solution zip 4 3 mb.

Insulation located below grade as required in climate zones 4 through 8 should extend the length specified in the table by any combination of vertical insulation insulation extending under the slab or insulation extending out perpendicular to the building insulation extending perpendicular away from the building should be protected by. Below grade under slab with foamular xps insulation. Specify this solution zip 4 49 mb.