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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.

994 Damp Proofing questions

Mould on clothing but not the walls

Hi,

I'm renting a terraced house. It's a 3 bed with the third bedroom being an attic conversion. My partner and I decided that we would use this room as our walk in wardrobe room as it had a built in wardrobe built into one of the walls, she uses this while I use clothing rails to hang my clothes (including my collection of Stone Island clobber)

When we first viewed the property I noticed mould on one of the master bedroom walls (the separating wall to our next door neighbour). This we were assured would be professionally treated prior to us moving in.

It wasn't, it was painted over!!! We discovered this shortly after our daughter was born... The mould reappeared and despite getting onto the letting agency we were ignored. We were even forced to put our daughter at risk of Sudden Infant Death Syndrome (SIDS) by moving her into another room to sleep at 3 months old, to protect her from the mould spores. There was also another mould patch on another wall.

We contacted the letting agents who visited the property. The conclusion was that because we had the original wooden guttering it it was rotten and causing water to run down the external wall causing mould to form internally (the effected area was about 5ft in length). The wallpaper was removed and the wall was treated by 'professionals' and left bare for 3-4 weeks before being re-wallpapered.

2 weeks after we moved in the landlord arranged for workmen to come round and gut the cellar as it had a major damp issue.

Then a few months later, after the summer my partner noticed mould on a number of pairs of her (leather) shoes stored in the built in attic wardrobe, this she found was spreading to her clothes too.

A short while later I noticed that my clothes were riddled with mould too and a horrifically bad mouldy/earthy smell filled the room. What struck me as odd was there was no mould on the walls/roof etc, just clothing

What is causing mould to form on clothing but not walls? I know for mould to form in leather there has to be 70-80% moisture in the atmosphere but as the damp specialist was sent by the landlord/letting agent and he's not concluded that there's an issue with the property they aren't willing to get the mouldy clothes dry cleaned. The damaged clothing cost £11,000 and they seem to think I've purposely put mould on them to get them dry cleaned!!

Also the mould on the master bedroom walls which was professionally treated... That's back now too!!

Any help would be much appreciated.

Airbrick height

My airbricks were level with ground for over 5 years, also no insulation in the external wall so when we cut off the plasterboard, you could see day light. Could this cause condensation damp?

Will removing trees help with damp problem? What else needs to be done and will it be a big job?

We have recently moved into a council bungalow that is wheelchair adapted, we've had several repairs done since we moved in. The latest issue we have is we've found mould on 2 walls ( in one bedroom and in a storage cupboard ) and also the floor in the cupboard gets wet when it rains ( a regular thing lately ) both of these rooms are next to each other and share the same outside wall.

Directly outside there are 2 trees right up against the wall, each one is around 6 to 8 inches thick at the bottom of the trunk, these trees are directly outside where the wet floor and mouldy walls are.

The council have told us the earliest appointment available for someone to come to look at this is towards the end of March.

Now I may be wrong but I'm assuming the trees are the problem here, but what I want to know is when the trees are removed, what else is likely to need doing to rectify the problem? Will it be a big job? How long will it be before it can be redecorated?

I would be very grateful of any advice offered.

Many thanks...

Mould growing on inner side of exterior wall

I have recently bought a renovated bungalow that has 9 inch brick walls that was build in 1935. The bedroom that is in the detached corner of the house has started getting mould on the inner side of the exterior wall and seems colder than the other rooms. At the moment, it is easily cleaned off the mould with bleach on a damp cloth but I would like to cure the problem. This corner of the house is also on the opposite side from the sun and therefore does not get much direct sunlight. Will dry lining the wall cure the problem or would mould simply grow on the inner side of the lining and cause problems in a year or so?

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?

Major mould problem in ground floor flat

My landlord is refusing to address the mould problem I have in every room in my ground floor rented flat. I have lived at this property for just a year and have been notified that the previous tenants had the same problem. I understand this is caused by poor ventilation but i'm doing everything possible to ensure the property gets as much air flow as possible short of leaving windows wide open in the middle of winter... HELP!!!

Damp kitchen floor - dug up concrete and earth below is damp - what are the next steps?

Hi have dug up the concrete in my small kitchen and I don't know what to do next. The earth below is damp and I doubt if there is any DPM underneath (house is 1900's) Any suggestions welcome!

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?

Damp on wall next to conservatory (single skinned wall with no cavity)

I have a lean-to conservatory butting up to two walls. The one wall is very damp, it is a outhouse/coalhouse, which I presume is just a single skinned wall with no cavity. We have tried to fix it with silicone and plaster but the water still seems to be coming in. It seems like it is coming in through the gap at the top where it butts up against the roof of the coalhouse. Please could someone advise the correct solution.
Many thanks

Salt / white crystals under floor board in grade 2 listed mid terrace house

I live in a grade 2 listed mid terrace house, converted into 2 flats, and I live on the ground floor.
Last year some of my bedroom furniture developed mould spores, only on the backing panel and underside of drawers. As I thought there was a problem in the chimney, as furniture was in alcoves either side of it, I had a survey done. There was no damp in the chimney and I have no signs of damp in the walls or anywhere else. A dropped joist was identified and has been repaired and the underground ventilation cleared as this had become blocked with stones etc, and I now use a dehumidifier in this room for 12-14 hours a day as the humidity was high. The room now has a better atmosphere and feels warmer. A year later and on looking under a floor board I have seen what I believe is salt crystals, it looks like white crystals. Is this from any damp drying out and what should I do next please? Do I need a specialist or do I need to wait longer? I live in the Wiltshire area and am finding it difficult to find anyone who deals with damp in older houses.

Thank you for your response Joseph/plasterworks

Damp problems on party wall

I have some damp patches on my party wall. My neighbour has problems all around the ground floor. They had a dpc injected 18 years ago but did not renew the plaster. On the party wall from their side there is no evidence of holes where a dpc was supposed to have been injected. Should you be able to see evidence that it was actually done? We think it may not have been & the damp patches in my house are coming through from their side. Does this seem likely?

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