Floor Slab Insulation Detail

Lightweight rigid polyisocyanurate pir foam insulation boards such.

Floor slab insulation detail. 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. The insulation is then laid followed by a polythene separating layer and either a concrete screed or tongue and groove chipboard ready to receive the specified floor finish. If headroom is tight then the only option may be to break up the existing slab dig further down and build up an entirely new floor. Since the slab will be approximately 5 degrees warmer than.

Roche has paused at an important detail. Where insulation is positioned above the slab the slab and dpm can be installed either way round. The insulation phase is crucial for a radiant floor. Such spaces typically have a sound level concrete slab floor but lack sufficient floor insulation to achieve the thermal performance targets for new habitable rooms.

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. There are many approaches to insulating a radiant slab but the detail at right shows a frequently used method. The f factors for slab on grade floors are defined in standard 90 1. The layer of rigid foam insulation that separates the concrete foundation wall on the outside from the slab on the inside.

Insulating a solid ground floor below the ground bearing concrete slab can be done using either pir insulation boards or eps insulation boards. Roche writes in a recent q a post that just about every foundation design for a slab that he s seen either puts all of the rigid insulation on the outside of the foundation or. Eps can be a cost effective alternative to pir for floor insulation and the same thermal performance can be achieved with increased thickness. 4 10 2012 3 climate zones e301 1 6 5 8 4 slab r value table 402 1 1 insulation and fenestration requirements by component e402 1 1 climatezone slab r valued 4 10 2 ft 5 10 2 ft 6 10 4 ft 9.

These f factors are acceptable for all slab on grade floors but you need to make sure. Mainly heated slabs radiate outward rather than downward so insulation on the edges of the slab is most important.