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Damp Proofing Questions

Our expert damp proofers have kindly agreed to share their wisdom on such topics as removing mould patches, rotten timber, causes of mildew, damp basements, rising damp, floor construction, flooding and waterproofing and much more.

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1,301 Damp Proofing questions

What will need to be done to sort out damp walls?

My stone house was built in 1920s. Inside, by the front door, the wall is damp and plaster coming off. Directly upstairs, new wallpaper is developing mould. There's a drainpipe outside. It's a narrow strip of wall - is the drainpipe to blame? My house is not well-insulated and there's plenty of air circulating.

damp on chimney breast

We have what looks like salt dampness on on chimney breast. We ideally wanted to lay laminate flooring in the next week and sort the damp in a few months time so we can actually move in to the house. Would the laminate have to be pulled up for remedial works?

Is this a vertical damproofing?

Hi. I have a barn converted to house in the 1960s. Recently took radiators off walls to find severe damp behind one of them(central heating apparently hasn't been used for 3 years).
Knocking some render off wall, I discovered a vertical, bitumen painted, corrugated, fibourous, 1mm thick continuous layer that the render has been screed onto.
Can anyone identify this as a damp proofing.
The rear of the property which is built into surrounding ground (up to 1st floor level) is currently dry, but the side walls (where this suspected damp proofing was found) are damp and this material has been compromised by screw holes for radiator supports and back box for electrical socket.
The front of property also has evidence of this layer of damp proofing where a gas pipe has recently been replaced.
I guess my questions are,
1. Is this a damp proof course
2. Is it any good, or was it a 1960's fad
3. What can I do about the rear of the side walls that are damp

We were strongly advised for a rewire (in fact it is part of mortgage condition)
Which is good, because when we looked in socket it actually looked damp and backing plated and wires were rusted!!

Sealer for asphalt steps

What is the correct product to seal old asphalt on path and stairs to front door of victorian terrace house? Water is permeating to cellar room underneath, so looking for a suitable sealer to paint over as a temporary measure.
------------------------
Thank you both for the replies.

My view is that this is a temporary fix. The old asphalt has expanded and shrunk over a long time and has outlived its useful life and needs replacing. It is full of cracks which I believe are most (but not all) of the cause of the water ingress to the small cellar below the path.

As a temporary measure I am looking for something to seal the asphalt whilst trying to retain a similar colour so that it doesn't look out of place with the rest of the street (i.e. blue grey of asphalt rather than a dark black). At a later stage I will have to get asphalt redone properly.

Any suggestions of branded products would be much appreciated.

Thank you

What is causing the damp spots?

Hi,
We have recently moved into a new house and re-plastered the bedroom. We have noticed that after the heavy rain yesterday a few wet looking area have appeared at the top of the wall. It is an external wall, part of an upstairs extension. We also get a lot of condensation on the windows, what could be the cause? could they be related?
Thanks
Rob

Patchy Damp Spots

Hi,

Since moving into our end of terrace Victorian House 2 years ago we have been trying to identify the root cause of patch damp spots.

They mainly reside in our dining room within the alcoves several inches above the skirting with some small patches on the chimney breast.

We also have some very minor spots in the Lounge and the 2 bedrooms above the lounge and dining room.

We have had many builders round and they aren’t sure.

I’m pretty sure it’s not the roof as we have had that checked also.

Could pointing be the issue? I’ve seen worse but it’s not brilliant and we appear to have some suspect bricks.

Should we also invest in some sort of damp proofing?

Thanks.

Injection damp proofing, has it actually been done?

Hi

I have recently had a local company out to carry out some damp proofing work on some internal brick walls. They are at the stage now where they say so far they have completed:

- Taken off the plaster to around 1m high.
- Drilled the two lowest courses of mortar approx every 100mm.
- Applied the injection damp proofing.
- Re plastered The Walls

All they need to do is re attach the skirting boards.

At this point i have decided to have a look at the work and from what i can tell, no injection has taken place, All of the holes which are still visible are empty and i can easily stick a screwdriver in them to approx 3inch deep, scrape away a bit and brick dust comes out.

Common sense and a quick images search on google suggests they should be full with something resembling a silicone seal.

Some images here:http://bit.ly/1TSLjxb

Any advice appreciated.

Penetrating damp on internal adjoining wall

Live in mid Victorian terrace and have discovered a damp patch on the downstairs wall that joins on to next house. It is half way up the wall but is dry above it and below it. Behind the wall is my neighbours chimney breast. He says he has no problems with damp. No signs of damp on the same wall upstairs. Is it likely to be from the roof or could there be another cause? I do not see any signs of rising damp. Floors feel dry and the cellar is dry. What should my next move be?

condensation and mould

I live in a flat on third floor no one above. I have bad black mould on exterior wall in bedroom. how can I remove the mould. have tried household cleaners.
How can I prevent it coming back. its the only room I have the problem. I have central heating. I don't put wet clothes on radiators. I have been told to line the wall with insulated plasterboard. It makes the room cold. Any advice would be welcome.
Thanks Lyn

Damp on bedroom wall

Hi - I'm considering buying a house which has some damp under a first floor bedroom window. I'm aware this can't be rising damp, but want to get a feel for how easily rectified the problem may be. The room is double glazed and also has a old chimney which appears to have been sealed with no ventilation - could that be part of the problem? It's a Victorian era terraced.

This is a picture

http://tinypic.com/r/sb6fs0/8

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