3 years ago i had a garage built in cavity wall filled with rock wall.
coping stones were laid on top with a dpm cavity tray underneath.
since then i have built above removing the coping stones but left the dpm.
i have since noticed that the inside blockwork BELOW the dpm is very wet even to the point of leaving a tide salt mark.
thinking that it might be cr*p on the ties and bridging i removed a few of the internal blocks to reveal nothing.
the damp blocks run the entire 9 metres of the side elevation, i suspect that the dew point is in the centre of the wall as it should be but is condensing on the underneath of the now redundant dpc and soaking the top of the rockwall under it, therefor bridging to the inside blocks.
am i right? and if so the only course of action i can think of is either remove the dpm in stages ie: remove various blocks cut out and replace or
drill air holes in the outside below, near ground level and also just below the original weep holes of the dpm.
im slightly dubious about holes as this may decrease the internall cavity temp and cause a dew point on the inner block causing a bigger problem.
has anybody else had a similar problem? grateful for any advise
thanks.
ken.
coping stones were laid on top with a dpm cavity tray underneath.
since then i have built above removing the coping stones but left the dpm.
i have since noticed that the inside blockwork BELOW the dpm is very wet even to the point of leaving a tide salt mark.
thinking that it might be cr*p on the ties and bridging i removed a few of the internal blocks to reveal nothing.
the damp blocks run the entire 9 metres of the side elevation, i suspect that the dew point is in the centre of the wall as it should be but is condensing on the underneath of the now redundant dpc and soaking the top of the rockwall under it, therefor bridging to the inside blocks.
am i right? and if so the only course of action i can think of is either remove the dpm in stages ie: remove various blocks cut out and replace or
drill air holes in the outside below, near ground level and also just below the original weep holes of the dpm.
im slightly dubious about holes as this may decrease the internall cavity temp and cause a dew point on the inner block causing a bigger problem.
has anybody else had a similar problem? grateful for any advise
thanks.
ken.