How this node works
At junctions — slab, reveal, corner — the vapour control layer must stay continuous: it is lapped and taped so no gap lets warm, moist air slip behind the insulation. The insulation is returned a short way onto the cold side to soften the thermal bridge that internal insulation always leaves at the junctions.
Key points
- Existing wall
- Insulation (returned)
- Continuous vapour layer
- Sealing tape
- Board
- Junction (slab / reveal)
Conceptual, language-neutral drawing for study and orientation — not an execution drawing. Dimensions and verifications belong to the designer.