Rigid Insulation Under Slab Detail

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Rigid insulation under slab detail.

Insulation located below grade shall be extended the distance provided in table n1102 1 1 namely 2 ft. In fact they are almost unintelligible. Roche has paused at an important detail. 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.

Depending on the use of the building the slab can then be finished ready for use or receive a screed suitable for a floor finish. 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. In climate zones 6 7 and 8 by any combination of vertical insulation insulation extending under the slab or insulation extending out from the building. If the insulation is going below the slab the damp proof membrane dpm is laid next followed by the insulation a polythene separating layer and the concrete slab.

Code requirements for slab insulation are very poorly written. Rigid insulation is placed vertically on the exterior face of the foundation wall. For under slab applications the rigid foam insulation typically should be installed over a gravel base with a poly vapor diffusion retarder between the gravel and insulation. Additional insulation is applied along the edges of the slab because that is a primary surface for heat loss.

Continuous insulation is defined in 90 1 as insulation that is continuous across all structural members without thermal bridges other than fasteners and service openings. Figure 4 11 illustrates a slab on grade foundation with a masonry foundation wall. R 7 7 rigid foam insulation model 310891 18 35 18 35. It is installed on the interior exterior or is integral to any opaque surface of the building envelope.

This insulation aligns with rigid foam sheathing that covers the framed walls above grade. Set your store to see local availability add to cart. The layer of rigid foam insulation that separates the concrete foundation wall on the outside from the slab on the inside. In climates zones 4 and 5 and 4 ft.

This compliance option is explained this way.