Our UPVC front door is "leaking" rain (a damp patch) under the sill, The
cement is in large part missing or loose. Tissue becoming damp/wet when
pushed into the gaps. Will replacing the cement stop this or is there
further action needed?
I had a similar problem with a porch door, about 10 years ago.
What had happened was that there was a fault in the sill, caused by the
factory drilling it for bottom drainage, where it shuld have drained out
through the outer face. It all depends on the design of the door bottom and
sill, the water that runs down the door, some of it will end up in the space
under the door, and drainage has to be arranged. Of not it will get into the
masonry under the sill, which is what you have got. I would get back the
firm who put the door in! replaceing the cement is not the cure!! it will
still get wet.
Our solution was to seal the unwanted drain holes and redrill in the correct
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