Lived here for 13 years - house is 23 y old. Extension done about 19 years ago .. by cowboys I suspect because I keep finding blunders! (e.g. roof had to be reinforced with steel when surveyor noticed that timbers were undersized! .. tried to trace them on another matter but the firm has ‘vanished’).
So it’s damp patches - one up, one down adjacent to external west facing windows (roughly 30cm by 30cm) . .. not directly above one another. Double glazing fitted about 10 years ago but I “think” that these patches had always been there – not severe but some efflorescence, spoil of decoration but I suspect plastering will be needed .. want to decorate these rooms at some time .. don’t want new plaster/decoration to be spoilt so how to fix damp first?
Cavity wall insulation fitted also about 10 years ago .. that could be the culprit .. or bad wall ties from original build but as the cavity is now filled with rockwool (or something similar) can I really ever hope to find those bad ties?
I’ve done some research. Products like ‘Stormdry’ seem to last a long long time (20-30 years according to the data sheet) and at £125/5l would probably be cheaper (?) than having a builder to work inside the walls; plus bonus of masonry would last longer and thermal efficiency would be enhanced.
The wall is 2 storey+loft and is totally exposed to the west and at the top of a rise so every rainstorm seems to batter it. UPVC fascias.
Would a high quality sealant stop the damp penetrating?
Any advice from the experts out there please?
So it’s damp patches - one up, one down adjacent to external west facing windows (roughly 30cm by 30cm) . .. not directly above one another. Double glazing fitted about 10 years ago but I “think” that these patches had always been there – not severe but some efflorescence, spoil of decoration but I suspect plastering will be needed .. want to decorate these rooms at some time .. don’t want new plaster/decoration to be spoilt so how to fix damp first?
Cavity wall insulation fitted also about 10 years ago .. that could be the culprit .. or bad wall ties from original build but as the cavity is now filled with rockwool (or something similar) can I really ever hope to find those bad ties?
I’ve done some research. Products like ‘Stormdry’ seem to last a long long time (20-30 years according to the data sheet) and at £125/5l would probably be cheaper (?) than having a builder to work inside the walls; plus bonus of masonry would last longer and thermal efficiency would be enhanced.
The wall is 2 storey+loft and is totally exposed to the west and at the top of a rise so every rainstorm seems to batter it. UPVC fascias.
Would a high quality sealant stop the damp penetrating?
Any advice from the experts out there please?