We’re hiring! Marketers, customer service and software developers.

Ask a Tradesman

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.

Answered your question? You can find a reliable and local Damp Proofing Specialist in your area today!

1,369 Damp Proofing questions

White furry mould on kitchen wall and on shoes in bedroom wardrobe!

Help! My house is being taken over by furry mould!!! I've got white furry mould on my kitchen walls (the same wall that the water stop cock pipe lives). This pipe gets very wet when I'm cooking dinner (even if I have windows open or the extractor fan on). Plus the windows fog up. I can live with the condensation in the kitchen but to my horror I noticed 2 pairs of my shoes in my upstairs bedroom wardrobe were covered in furry mould!!

I've read comments on the internet about steam from my bathroom going in to the bedroom and recommending the air ventilation units, but what if I were to have the heating on low all the time (instead of paying nearly a grand for the air unit!) is this a common problem? I don't know anyone else who this happened to and I only bought the house in March so am a bit worried! Thanks

Wet patches on internal kitchen wall

Hi all, I wasn't sure whether the damp section was the correct place for this question or not really. Please help, this is stressing me out!!

Apologies in advance if this is long (it will be!) - I want to include everything as I'm not sure what's relevant. Basically, we have really bad wet patches on our kitchen wall, which is an internal wall, shared with our neighbour (we're end of terrace). They're quite random, spread over a couple of metres of wall and they are particularly bad around the plug socket (weak area of the wall I guess). There's also a thin, wet line running upwards from the plug socket which is over a metre high. There are wet patches along the bottom or the wall above the skirting board and little wet spots here and there. I feel like the wooden floorboards by the wall also feel a bit damp and cold. It's hard to describe how it looks without pictures - I can send pictures for more detail if anyone fancies taking a look?! The patches on the wall are very wet to the touch and seem to be getting worse quite quickly - they first appeared a few months ago and they have got maybe 7 times worse in that time.

These wet patches only started to appear a few months ago when we got or kitchen repainted (that could be coincidence). The other side of the wall is our neighbour's utility room but she assures us that all appliances are plumbed in properly and she hasn't had any leaks etc. Although, to be honest, we haven't really pushed her or asked her in the last month or so. A few months ago we had a really heavy rainstorm in the night, the drains in our road overflowed and our neighbour's garden and I think even her utility room flooded - although the 'flood' only lasted a couple of hours max. Could there be a bit of a time lag and the flood water is now coming through the wall? If that's the case, will they finally just dry out?

Fundamentally, I'm wondering if anyone has any suggestions about what could be causing these wet patches and the damp feeling to the floorboards? I don't mind having problems with my house if I know how to fix them but I just don't know how to get to the bottom of this one or who to ask. I don't really think a damp proof company is the best place as they won't be able to get to root of the problem I don't think. Does it sound like a leak somewhere perhaps? Could the drains be blocked? Could there be a burst pipe underground near the wall? I'm worried it's a sign of some really bad problem? Is it a sign of problems with the foundation? If we leave it, will the whole wall finally saturate and collapse?!

If anyone has any ideas/advice about all this I would be HUGELY grateful. I just don't really know where to go from here and I'm finding the whole thing really stressful. Many thanks in advance.

damp wall on old rubble walled cottage

I live in a c. 250 year old detached cottage. The walls are solid stone / rubble c. 1’ thick.
We are experiencing what I believe is rising damp on the inside of what is an external facing wall. It is only on 1 wall (the adjacent wall, that is also external facing, has no signs of damp whatsoever and has been tested with meter - it was bone dry). The damp patch is in a wave running the width of the wall (about 12’) and height of 4’ at its peak, running to c. 1’ at the corner.
The periods of damp are highly intermittent – we have periods where the wall is very dry, and periods where it is wet to the touch. As a general trend it is worse in the evenings than at any other time during day.
We have a “copper wire” DPC installed (this was present when we purchased the house). The green light is on at the base of the unit and there are no other signs of damp on any other wall so can only assume this circuit is still complete and the dpc is working.
We had a surveyor friend round who believes issue is rising damp. The wall we were experiencing the problem had a concrete path running along the outside that was quite a bit higher than the internal floor. He suggested the dpc may be being breached by this path so suggested we dig this up so external floor is same level as internal, which we have done. The damp dried up for a week or so, but has now crept back. This could have been entirely coincidental – as per above, the periods of damp are highly intermittent.
There is a set of pipes running from the boiler into the house at the wall that we are experiencing the damp. It has been suggested a small crack in these pipes could be source of damp, but we were advised the dpc should stop this anyway…
Please help – any advice greatly appreciated!! Not really sure where to go next, but trying to avoid spending too much money as long term plan is to extend the house an ultimately knock down the offending wall anyway!
Many thanks

Damp returning in house which had rising damp injection and specialist plastering done

Hi, we had a rising damp injection and specialist plastering done to our house downstairs in 2007. We've now found that there are signs of damp/mould returning - quite badly in two places. We've got the same company back and they are reinjecting from the outside walls and have told us to try and clean and repaint the inside walls, and "see if it returns". According to the business owner, it's to do with condensation in one area and a salt reaction in another, and according to the contractor doing the injection today, it's damp! Can anyone help with any advice? I'm aware this company have guaranteed their work for 30 years and I'm also concerned about living with damp and the effect on the family's health. Thanks

Hi ADR - built 1904 and solid wall construction, Edwardian house

damp on party wall - do I really need a survey

Hi. My son has just bought a house, a 1930's semi, and damp meter recordings showed some damp present. The only visible signs of damp are some peeling of wallpaper and signs of mould extending a few inches at most above the skirting board along the party wall with their neighbour. I am not sure if this is historical as it does not feel damp, or particularly cold even, to the touch, and interestingly, the cupboard on this wall has no signs of damp in it at all. There is no smell that we have noticed and the skirting boards look fine. I do not want them to get a free survey as I know these firms sometimes recommend damp course insertion etc afterwards when this is not necessarily the answer. Of course, they want to start off on the right foot with the maintenance of their property but want to spend their money wisely. Also, I am wondering what a survey would involve as they have laminate floors, the lifting of which would of course be a problem. Advice please!

Do I use permaseal damp proof paint under a render?

I've just bought an old cottage that requires quite a bit of work including some damp proofing. After several (expensive) quotes I thought I'd investigate myself. After hacking off the render back to the original stonework the walls look pretty good and are mostly dry apart from a few areas that do show bad quality old pointing with obvious damp issues.
My question is; could I use a Permaseal type damp paint to act as a barrier on the original stone and then render and plaster over it or is there a better method?

How to fix damp, mould, cracks and flakey plaster

We have a 1930's property and we have recently found several areas inside the property (both floors on external walls) where the walls and skirting are damp to touch. There are some areas that have mould and there is a lot of flakey and soft plaster on and around the ceilings on the upper floor rooms. We suspected the gutters may be overflowing so these have recently been cleared and we planned to get a dehumidifier. We want to replaster one of the bedrooms that is particulary bad however we want to be sure we have identified the problem. Since clearing the gutters most of the areas have improved however there is still moisture in other areas. I have also now noticed a lot of cracks around the house and I am unsure if these were here before. The cracks are generally around door and window frames but there are small cracks all over the house. I don't know if I am becoming a bit paranoid now but I would like to be sure that there is not a bigger problem before I arrange to have anywhere replastered. Should I get someone round to inspect? And if so, who do I need to contact?
Many thanks

Damp floor at the base of Chimney breast

I had wet walls across one side of my dining room, the wall had been injected with a DPC before I bought the house, and the work was guaranteed so the guy came back and removed the plaster etc and injected again, this time a 15cm higher. So I thought the damp issue had been resolved, however when we put down a new solid wood floor, we have noticed that the planks near the base of the chimney have started to warp and separate. Again before I bought the house, the Chimney stacks was removed at roof level but the chimney breasts still remain, there is a vent in the chimney breast but there does seem to be some moisture around the vent.

Can anyone provide me with possible causes of the damp floor or steps that I should follow to help me workout where the moisture is coming from. I was going to start getting a roofer to check the roof where the stack had been removed.

I did lift the floorboards up before i get the flooring laid to check for dampness but it looked fine. The walls that had the DPC seem ok now.

Any help would be greatly appreciated.

Damp proofing concrete garage floor

Hello, I have a garage with an old concrete floor in it. I painted it with garage paint about two years ago, but damp is coming through and forming little white crystals at some spots. All I want to do with it is damp proof it, so not put a complete floor on top of it. I was thinking of putting a layer of DPM paint on it, would that do the job? And would it last when I wlk on it??

Thanks for any help,


Damp Patch in living room peeling paint

We have tried painting damp seal on numerous times and the paint is still peeling. What should we do or what can be done? We are reluctant to do anything that will damage the whole room as is was only plastered last year. We have a cellar underneath and we have done all we can to ensure that it breathes. We are fed up of it and just want it sorted but don't know what the next steps are.

Thanks in advance!

Need help with your project?

We have tradesmen ready to help you. Post a job, read reviews and hire today.

Post a job

Hire a local tradesman

We have tradesmen ready to help you. Post a job, read reviews and hire today.

Need some tips or advice?

Ask a Question