Insulation Requirements For Slab On Grade

The prospect of slab on grade insulation can become complicated.

Insulation requirements for slab on grade.

Insulation requirements for slab on grade floors can be found in section r402 2 9 of the 2012 iecc and section n1102 2 9 of the 2012 irc. R 5 shall be added to the required slab edge r values for heated slabs. Yet slab on grade insulation can be arranged in a number of configurations each with pros and cons. One arrangement may be more conducive to maintaining a continuous thermal barrier from a wall down through its foundation but it allows unsightly exposure along the building perimeter.

Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8. R402 1 1 4 interior foundation insulation requirements. Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and. Insulation extending away from the building shall be protected by pavement or by not less than of 10 inches 254 mm of soil.

The r value to use depends on the results of your compliance analysis. Any insulation assembly installed on the exterior of the foundation walls and on the perimeter of slabs on grade that permits water drainage shall. Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation. Slab on grade insulation requirements in ashrae standard 90 1.

Be made of water resistant materials manufactured for that intended use. Where the slab on grade floor is greater than 24 inches 61 mm below the finished exterior grade perimeter insulation is not required. 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. It seems like it should not be so complicated.

Slab perimeters must be insulated where the top edge of the slab is above grade or less than one foot below grade see figure 6 6. When it does project teams will often lean on energy codes and standards to settle the issue.