Can anyone explain what kind of damp this is and what might be causing
it? There is nothing amiss or damaged on the outside of the building that
could account for it so I'm at a complete loss as to what the underlying
problem could be. Here's a pic:
On Wednesday, 17 July 2019 13:35:26 UTC+1, Dan Green wrote:
It could be water getting through bad pointing or cement rendering as well
as the above.
It could be many feet above the door and dripping on to the cavity tray abo
ve the door & running off the end of it.
Could be condensation, but also the ground level outside could be close
to the DPC. You may also get splashback from the hard surface.
(I had a similar problem here, which in the end I tracked down to a down
pipe from the gutter. It went straight into the ground, but did actuall
appear to be connected to the waste water pipe - stick a hose in the
gutter and it ended up arriving at the septic tank.
In the end I had a dig to investigate, and found the builders had
effected a transition from square downpipe, to 110mm soil pipe by
stopping the downpipe a bit above the soil pipe and "sealing" the gap
with a carrier bag! So a proportion of the water soaked straight into
the ground right next to the wall. So I figged a proper gully with trap,
and let the pipe empty into that. Replaced the rotten floor timbers, and
made sure they were not pressed right up against the wall this time.
Been fine since.
Daughter had this in a rented place before she bought their own place. The
landlord got a damp survey and I was there when the surveyor did it as
daughter was at work.
He explained it was condensation. I was dubious and asked how he could
tell. The explanation was that, if the moisture came through the brickwork,
the minerals inhibited the black mould. The landlord installed one of those
heat exchange extractors- they warm the incoming air with the outgoing
(warm) air. It solved the problem.
You may not need to go as far as the extractor, just look at ventilation
and possibly a dehumidifier.
Corbyn & the EU, the Nazi’s next step: "Our aim was Europe a nation. Our
faith European Socialism" Mosley "My Life" autobiography 1957.
Moisture that side of the wall can evaporate. On the inside, warm air
hits cold wall, and the moisture in the air condenses. Ventilation may
be an issue too. The spores may have got into the plaster, and that part
of the wall is locked in a cycle of mould.
Possibly. In the absence of another explanation it might be worth taking
it back to brick and replacing the browning/plaster with something a bit
more mould inhibiting, or if there's room, dry lining that portion of
the internal wall.
the original timber door had a vertical dpc which would have been nailed
to the vertical section of the frame and built into the two leaves of
the wall around the cavity closer.
When that UPVC door was fitted, the oik who removed the old wooden
frame may have pulled out this dpc and now any water getting past the
outer mastic seal is making the outer leaf of the wall (hidden by
the frame) damp and this is tranferring into the inner leaf and
causing the problem that is now apparent.
The only solution now is to make sure the mastic or low modulus
sealant is effective and free from holes.
It cpould be condenastion. but my gues iss as follows, having had fairly
Somewhere way up in yer cavity wall there is a leak, farily swmall - say
4mm diameter in some nastic etc..or an old TV aeial pulled out - and
water is running down in the cavity until it gets to that window, or te
door, which bridges the cavity ., stops it, and then its running off
the edge and down inisde the cavity by the door frame and pooling at the
So look higher - much higher for where the leak is.
I used to get water dripping from my window frame tops onto the cills
from rotten bargeboards a storey above.
"When one man dies it's a tragedy. When thousands die it's statistics."
Frame drainage blocked so water finding it's way out via plastic welded
mitre joint in corner, or tracking through a frame fixing screw or
running along frame DPC until it gets to the corner?
Combination of the above?
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