We have a 1950s brick house rendered on the outside and were getting damp in the plaster around a window reveal. I have cut the plaster back, foamed around the window (there was no foam previously) and resealed with silicone externally. I believe the issue is that the window is mounted ~5cm forward on the external leaf, thus creating a cold bridge.
My plan is now to close the cavity with a strip of DPC against the external leaf and a piece of celotex wedged and foamed in place. Once that is done I'll dryline with Marmox and plaster over top. I can't use a pre-fab cavity closer because the reveal face is very uneven and the width of the cavity wanders from 25-40mm.
My questions:
1. Where do I place the vertical DPC given that my windows are mounted so far forward on the external leaf? Do I need to wrap it around the corner and run it up to the window frame?
2. How do I stick the vertical DPC to the block, and will this impact my ability to dot and dab Marmox board over the reveal?
My plan is now to close the cavity with a strip of DPC against the external leaf and a piece of celotex wedged and foamed in place. Once that is done I'll dryline with Marmox and plaster over top. I can't use a pre-fab cavity closer because the reveal face is very uneven and the width of the cavity wanders from 25-40mm.
My questions:
1. Where do I place the vertical DPC given that my windows are mounted so far forward on the external leaf? Do I need to wrap it around the corner and run it up to the window frame?
2. How do I stick the vertical DPC to the block, and will this impact my ability to dot and dab Marmox board over the reveal?
