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What is the layering sequence when installing a slab on grade?

architect55 | Posted in Energy Efficiency and Durability on

Moisture barrier, rigid insulation?

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  1. GBA Editor
    Martin Holladay | | #1

    Robert,
    From the bottom up, here’s how the layers should go: Crushed stone; rigid foam; polyethylene; concrete.

    If you want to learn more, see Polyethylene Under Concrete Slabs.

    .

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