Insulation Requirements For Slab On Grade

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.

Insulation requirements for slab on grade.

The prospect of slab on grade insulation can become complicated. 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 insulation should extend downward from the top of the slab on either the outside or inside of the foundation wall. R402 1 1 4 interior foundation insulation requirements.

Be made of water resistant materials manufactured for that intended use. Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and. 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. The r value to use depends on the results of your compliance analysis.

It seems like it should not be so complicated. Any insulation assembly installed on the exterior of the foundation walls and on the perimeter of slabs on grade that permits water drainage shall. Slab on grade insulation requirements in ashrae standard 90 1. If the slab edge insulation is on the exterior the insulation must be protected with a rigid.

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. Insulation extending away from the building shall be protected by pavement or by not less than of 10 inches 254 mm of soil. When it does project teams will often lean on energy codes and standards to settle the issue. R 5 shall be added to the required slab edge r values for heated slabs.

Both codes state slab edge insulation is not required in jurisdictions designated by the building official as having a very heavy termite infestation. Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8.