This isn't strictly a DIY question, but it is building related and there's a
lot of knowledge and experience in this group, so I'm hoping you can help.
My basement was very badly "converted" by a builder who failed to put any
waterproofing system in place. As a result it is damp. I've looked in to
putting it right, which basically involves stripping it all back to bare
walls & floor, putting a waterproofing system in and then refitting
A builder who has quoted for the job has offered to show me another
conversion he had done, which I have just checked out. It all looked
perfectly good, but I was slightly concerned about one thing. Where the gas
meter is sited, the waterproof membrane (a plastic sheet with large dimples)
wasn't sealed up - that's to say, two pieces met behind the meter, but you
could easily pass your fingers between them and touch the brick wall, in
contact with the earth, behind.
AIUI, such systems are dependent on a perfect seal and any breaks in that
need repair to prevent the system from failing. When I asked the builder he
said that the specific spot wasn't a problem and that moisture could still
drip behind and gather in the sill etc. This was at about eye-level, if that
makes any difference.
Am I being overly-cautious or should I question this point further?