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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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1,248 Damp Proofing questions

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.

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Plasterboard sides of windows getting damp, and growing mold?

On the sides of my bedroom window the plasterboard is damp and is now getting mold. I have cleaned it with bleach and water but because its damp so it just keeps growing back. I have checked the outside and its all sealed and don't know why its getting so damp?

Any advise would be great, thanks.


Mould in spare bedroom wallsl

Hi there in my spare room I seem to get damp/mould coming through the wall, not sure how to make this better as it does get really bad then it will go again but it's a on going thing,

Thanks Liam

Renovation project with 30yr old damp proofing

We've recently bought a fabulous renovation project and intend on doing everything to it. The house was built in 1908 and has a rendered exteriour with quite a few cracks, we did have a sctuctual survey done before we proceeded with purchase but it seems the cracks have come from a new road which runs along the side of the house causeing vibrations.
Anyway, back to my initial question...
When we purchased the house there was a damp proofing guarantee which was passed to our solicitor - this expired July 2014. As we've taken all ground floor walls back to the brick and intend in replacing the lintles above the windows. Is it worth or is it required, to have the damp proofing done again? And what are the average £ per sq mtr?
Thank you

How to trace source of damp patch on chimney breast? Chimney pot capped and stack repointed

There is a damp patch on the chimney breast which has been there for some considerable time. The chimney pot has been capped and the stack repointed. The chimney is built on the outside of the house.The patch is on the wall in the downstairs room. Originally there was a solid fuel fire now replaced by a gas fire which is rarely used. Rain does not automatically increase the size of the patch. Has anyone any ideas where the problem comes from or how to trace the source.

What is best to cure rising damp at my property - inject or vandex?

Hi i have a victorian terraced house that suffers from rising damp. I have been given 2 options to cure the problem and i want to know the best solution.

One is to inject and sand and cement and then replaster the walls
The second is to vandex the walls the sand and cement and replaster

Can anyone help me making the decision
Thank you

Damp proof still effective (now plaster has torn away)?

Kenwood came to treat a patch of rising damp by our front door where it was shown the damp proof course was not effective.
They plastered afterwards and put the plug socket back against the wall (our plug box and wires is on the outside of the wall). They did not glue the box back, just pressed a box up against it to hold it in place.
We've not known this, so when we removed the box, the plug box has come away from the wall, taking the plaster with it.
They are saying this is our problem, and it needs to be fixed by an electrician. But my concern is: is the damp proof course effective now the plaster has been torn away?
Any advice gratefully received.

Damp proof membrane on kitchen floor

If I lay the DPM Membrane, does it have to come up the walls all the way to accommodate all the layers? Sand, Kingspan and concrete etc? Want to make sure I get it right! Thanks

Damp where chimney removed, and behind K Rended wall

We are spending a fortune trying to eradicate damp from a house we bought ... It's about a hundred years old. We had rising damp in a couple of rooms which was professionally treated. Among other things we have rebuilt a chimney that was causing damp in the bedroom below. We replaced various windows as damp was occurring near them and have replastered pertty much throughout.

We re rendered the front of the house with KRend a few months ago and are re rendering two other walls with KRend but problems are already recurring behind the KRend'ed wall following recent rain after the very dry summer.

There was a fireplace in the hall, which has been blocked off and the stack removed, roof retiled. The rear wall of the the flue is in the front room and this is damp in various places.

Getting very fed up .., advice please!

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