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We have had problems with walls being damp in patches when it rains. We have a butterfly roof and coping stones.
Anonymous user 01/03/2024 - 2.45 PM
Roofers say roof ok. do not know where water coming from.We have had lead flashing put against parapet wall and roof, cemented under coping stones but still same problem when it rains. Could it be that there is water ingress under coping stones. Not sure where to begin. Advice been to render parapet wall and put waterproof membrane under coping stones also to plaster internal walls with waterproof plaster. Help
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8 Answers
Anonymous user
If there is brickwork exposed to weather, ie, driving rain then it is possible that the cement course needs attention. Check there are no gaps, broken, bricks etc. If so it may need re pointing. Also, broken roof tiles, even if they are only broken on the corner.
Answered24 January 2012
5
Anonymous user
If all the lead valleys and flashings are okay, you might want to check that there is a dpc under the coping stones.
If the brickwork is in poor condition, then render will help.
I wouldnt bother with water proof plastering, you need to solve the problem of the leak first.
Answered24 January 2012
4
Thanet Property Maintenance
Rating: 5 out of 5
Hi, in regards to your question on damp walls, yes, if your parapet walls are old and in some need of repair: Re-pointing with sand and cement mixed with EXTERIOR GRADE PVA or you can render the whole wall if your bricks are decaying, but the mix should have a Waterproof PVA that acts as a sealer and waterproofer
Answered24 January 2012
3
Anonymous user
We had a problem similar with coping stones over a cavity wall. On the underside of the lead flashing under the copings condensation formed then ran back into the property. Took ages to find but a few vents solved the problem
Answered24 January 2012
3
MD Construction
Rating: 5 out of 5
if the coping stones have had a dpc membrane placed across the cavity all the way up and where it joins the main building there should be no water coming in throughthe joints to the copings, water can penetrate into the bed joint but if this has been done properly water rarely ingresses through the bed joint, possible cause could be from the parapet wall joints if these have not been pointed properly as it sounds like the water ingress is hitting the tie irons and coming through to the inside wall
Answered24 January 2012
2
Anonymous user
could be penetrating through the walls and not the roof ,old rendered walls are forever having this problem
Answered24 January 2012
2
WYEVALE PROPERTY CARE LTD
Rating: 5 out of 5
There's cracked tile or your felt as gone the end and it's running in to the caverty have a look at your roof to see if a tile as gone check felt is going into you gutter the ridge caps will be the last thing to go hope this helps
Answered24 January 2012
2