Hi Self Builders
I need a steer, please
I have a new built masonry house, with a cavity and standard DPC window details. I had wet patches low down on the internal reveal - a wet quadrant from junction of window cill and window frame.
The builder resolved it with additional mastic around the frame on the outside, and it seems dry now.
My questions are
- shouldn't the DPC have directed the wet out, before it got to inner leaf?
- is mastic in this case a robust solution, or will it need replaced, maybe every 5 years?