Damp course
My sister has a 1930s semi- detached house ,all completely rewired, new kitchen/ bathroom and fireplaces removed. Replasteted. Done about 10 years ago. She now has ' rising damp ' on the inner connecting wall of the dining room. The builder says she needs a new damp course . Though this was done too 10 years ago.
I have never heard of rising damp on an inner wall. Is this possible. And what could be the cause?
Advice from 14 local tradespeople
This all depends if the floor is timber and the joists are on a sleeper wall or if solid flooring if the floor is solid concrete every chance a approved dpm hasn't been fitted if timber the joist should be wrapped in a dpc
This could be due to poor ventilation as the fire places have been removed as they are a natural vent also if your windows are old they may not have trickled vents the damp cours should still be good after only ten years
could possibly be a leak causing the damp . but could also be faulty damp proofing in brickwork or faulty dpm under flooring .
If the house is that old its possible that it probably has a celler and the dpc system will be old and inadequate for the house now ,,now days we tank cellers out to stop damp over 100 years
Need a new DPC
Lack of dpc and water/damp rising from under the floor , just resolved same issue on a job I’m on.
the wall is damp because the wall is cold and the room is poorly ventilated
Check under the floor as it may be wet. Or you may have a leaking pipes.
Possibly is that 1930s houses were built with a slate course were as modern day houses are built with a damp course ( DPC). That could be the reason for rising damp internal.
Several issues could be the case here, most common on this age of build was the step footing design. It was never build of a solid foundation like concrete (although certain people would say the old way was best) movement in the step footings can cause gap in the foundation therefore water can rise up and into it, that said a internal wall is strange maybe a leak on pipe work it may seem odd saying that but you would be surprised how many insurance jobs we do that are leaks internally and is the issue of the home owners to rectify. Hope the above helps. Thanks LMH Estates
These old properties never had a damp course and was most likely laid with no foundation. You can buy a damp proof product that you drill into the wall at low level to help stop this
Yes got a tray from floor level inner leaf to 150 ml drap outer leaf also could be insulation problem depending on were the dampness is going two things a would correct
It is possible for rising damp to occur on inner walls, it may indicate a problem with the damp-proof course because that should prevent moisture from rising up through the walls.
Another possible causes of damp on an inner wall could be condensation.
It can happen on the inside skin as now we damp both the outer and the inside not sure back in them days they did. So it will need a damp course injection or rods on the inside wall
