Chris Plastow
First check is to observe condensation on the bottom of the window frame/ sill joint to frame. If no problem there, it is coming from outside
There's a growing dump stain on a wall + windowsill has swelled up. I
Posted by Val , on
There's a growing dump stain on a wall + windowsill has swelled up. I think it could be terrace waterproofing problem. How can I be sure of what's the cause?
