Ground Bearing

Ground bearing concrete slab details for masonry cavity, timber frame, steel frame, CLT, stone-faced and SureCav walls. They show insulation both above and below the slab, so you can compare the two and see how each affects the DPM, the floor finish and the junction with the wall.

Insulation above or below the slab? Below the slab keeps the concrete on the warm side, giving thermal mass. Above the slab heats up faster and can suit underfloor heating in a screed. Both are shown.

Where does the damp-proof membrane go? It depends on the build-up. Each detail shows the DPM position and how it laps with the wall DPC.