Insulation Requirements For Slab On Grade

Any insulation assembly installed on the exterior of the foundation walls and on the perimeter of slabs on grade that permits water drainage shall.

Insulation requirements for slab on grade.

Insulation extending away from the building shall be protected by pavement or by not less than of 10 inches 254 mm of soil. 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. 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. 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. The prospect of slab on grade insulation can become complicated. 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.

The r value to use depends on the results of your compliance analysis. 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. Where the slab on grade floor is greater than 24 inches 61 mm below the finished exterior grade perimeter insulation is not required. Be made of water resistant materials manufactured for that intended use.

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. Yet slab on grade insulation can be arranged in a number of configurations each with pros and cons. It seems like it should not be so complicated. 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.

R402 1 1 4 interior foundation insulation requirements. Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8.