I'm planning to commission a double garage next to my house. It will have insulated cavity walls and a concrete slab floor with rigid foam insulation under it - making it also suitable for use a workshop.
Being a garage, the floor will be level with the surrounding ground - unlike a house where the floor is above ground level. There will be a DPC membrane under the floor insulation and continuing up the walls. There will be a DPC layer in the brickwork, two courses above ground level.
But I'm not sure where the two should meet! If the DPC in the inner brick skin is at the same level as the outer skin, the bottom two courses inside the garage will have no damp protection. So should the membrane come up to floor level, then outwards under the inner skin, and then up inside the cavity? Or what?