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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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1,397 Damp Proofing questions

Rising Damp in hallway

Hi,

We have had a little bit of damp in our hallway ever since we moved into our 1900's terraced house over a year ago. Since moving in, the damp has fluctuated between dusty on the wall to a 'damp' wall. The wall in question is the wall between our house and the next, and recently, the floorboards underneath this damp have started to go. Do I need a builder ASAP. as we can't really afford one now? And also, is there anything I can do in teh meatime, other than trying to make sure the the doors to the hall are open so that the damp dries out a bit?

I would be greatful for any help!

Thanks

Tanking behind skirting

Is it necessary to tank behind the skirting when the job is being done. Also is it possible to just do patches of tanking on a wall?

Damp/watermark on wall (about half way up stairs)

When we took the wallpaper off the walls on our stairs some of the paint behind it started peeling away. I removed most of the paint from the area and there is a watermark on the wall and the texture is different there than other parts. This is about half way up the stairs. I then removed the wallpaper from the area under the stairs (which is directly under the watermark) and it came away easily as it was very wet. Under the paper was a lot of black mood. Is this a sign of rising damp?

How do I know if any DPC has been injected at all?

I have had an injected DPC performed 4 years ago and the damp keeps coming back. It is at it's worst yet this year. I noticed other houses seem to have a residue around the drilled holes, presumably an over-spill of the DPC? My property has the holes but no residue. How do I know if anything was injected?
The property is of solid wall build circa 1910. damp is at bay window wall.
Thanks

E

Understanding damp meter readings

Hi, I'm having difficultly in a flat I'm privately renting from damp issues, possibly condensation but after doing everything (heating, ventilating, dehumidifiers etc) not solving the issue, so I have just purchased a 4-pin damp meter.

http://www.ebay.co.uk/itm/310818252269?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649

Sadly it has no instructions on how to interpret the readings and searching the net seems to leave to leave me confused although I did read this somewhere:

Normal (< 10% to 16%), attention required (16 - 20%) and Action required (20-28%).

Is that accurate and how would this testing equipment really fair on walls?

I have taken a few readings with the walls I'm concerned about and it ranges from 20 - 26% even from top to bottom, I took a reading in a room not so bad at around 10-12% top to bottom.

Thanks for any help you can give me.

damp patches and rising damp in badly pointed extension

We have just moved into a semi detached property and the exterior side wall of the extension is very badly pointed meaning damp seeps through and can be seen on the internal walls. There is also rising damp present. One builder recommended the most cost effective way to deal with this is to plaster the entire outside of the wall and add some kind of damp proof treatment to the plaster or paint over the plaster with damp proof paint. Is this the best way to deal with this problem?

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

Damp patches on internal chimney breast despite replaced slates, fixed flashing and repointed chimney stack

My property is a 1940s semi detached ex council house which i bought 3 years ago. Last January I noticed in the bedroom with the external wall a damp patch on the side of the chimney breast. It was near the top where the breast meets the ceiling but there was also a patch lower down the breast. I have had roofers out who have replaced slates, fixed the flashing and repointed the chimney stack but the damp still appears to be coming through. I have also recently noticed a very small amount in the room directly below the bedroom, again on the chimney breast.

Can anybody suggest anything? Am I best to get some sort of surveryor out to take a closer look?

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

Hi
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
Justin

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