Musty/damp smell in house (but no visible signs)

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We recently moved into a house that had stood empty for some time, and we're having a lot of trouble shifting an unpleasant musty smell which we're concerned may be a sign of mould. It's the kind of smell you would associate with damp and is quite strong around the entrance hall and living room, and to some extent the downstairs toilet, but not so much the other rooms or upstairs except when the windows are open and the smell drifts through the house. At first, we kept internal doors shut to prevent it spreading and just tried to air the problem areas, but since then we've been opening all the doors and windows to get a really good through-draught. We tried using a carpet cleaning machine and a dehumidifier but it made little difference. We have also removed blinds and used bicarbonate of soda on the carpets, along with white vinegar - all the usual stuff recommended for odour removal. Despite persisting with this for a few weeks, it doesn't seem to be getting any better (although confusingly, it does seem to fluctuate with no obvious pattern as to when it's better or worse).

The house is a mid-80s build and is generally very well-maintained, with no visible signs of damp on carpets or interior walls. The exterior walls have some slightly green areas on the lower brickwork, but nothing that I'd regard as out of the ordinary. There is a large brick fireplace in the living room with white residue on the bricks, but it looks like effloresence rather than mould. It's very hard to pin down the smell to a precise area - it just seems to linger in the air, but it must be coming from somewhere. I keep wondering if there's damp underneath the floor somehow, but then there's nothing growing on the carpets and no feeling of dampness.

The smell is strong enough that it clings to clothes, bags etc and is quite noticeable when we leave the house, and it's a bit of a worry as I know there are health implications if we have mould spores floating around, not to mention the risk of contaminating all the soft furnishings, books or whatever else that we've moved into the house. As we rent the place, we've obviously taken this up with the landlords, but they seem nonplussed about it, saying they're not aware of any issues and the house was their own home for a good number of years before they downsized and decided to rent it out (we're the first tenants). Annoyingly, the smell wasn't quite so strong when they came round. For the time being, we just agreed that we'd spend a bit longer doing what we're doing and see if it improves, but it has only improved marginally at best, except for the odd moment when it seems to ease off for no obvious reason. We haven't really 'gone heavy' on this with the landlords as we were keen to get things off to a positive start with them and try what we could to solve it ourselves, but we're beginning to wonder if we might need to get a specialist in to try and figure it out. I don't know if the landlords would be liable for that when there's no visible signs of mould or damp, but it's pretty unpleasant so we're reluctant just to try and live with it. I'm also concerned that it might get a whole lot worse as we move into colder, damper weather and can't ventilate so much.

So, if anyone has knowledge or experience with this kind of issue - suggestions of things to try or potential causes to investigate - I'd be grateful for any advice.
 
How long was the flat vacant before you moved in?

Have you tried opening all of the windows over the weekend (assuming that you are there over the weekend)?
 
Is it a suspended ground floor (floor boards) or a solid one?

Definitely feels/sounds like it's suspended. There's fully-fitted carpet/laminate/vinyl throughout, so I've not been able to inspect further.

How long was the flat vacant before you moved in?

Have you tried opening all of the windows over the weekend (assuming that you are there over the weekend)?

It's a detached house. Good question as to how long it was vacant... I meant to ask the landlords but forgot. :rolleyes: I would guess at least half a year but possibly a fair while longer. We have had the windows fully open near enough all day long for the past couple of weeks and the smell just seems to persist and drift around on the breeze but never actually goes.
 
Definitely feels/sounds like it's suspended. There's fully-fitted carpet/laminate/vinyl throughout, so I've not been able to inspect further.

With no obvious, other cause, then I would be inclined to see if you can find a way to inspect under that floor for signs of water. Its not unknown for them to be flooded.
 
The smell is not damp per-se, so no good looking for damp, altough you may see mould associated to dampness

The smell is mould fungi/spores, and these may be in any carpets, curtains, cloth or wall paper.
 
What sort of backing do the carpets have? We had a room that had a damp musty smell. I thought it was damp. Turns out it the carpets were old and the foam backing had deteriorated and that was the source of the smell. As Woody says, probably a bit of mould in there as well. New carpets and underlay solved it.
 
What sort of backing do the carpets have? We had a room that had a damp musty smell. I thought it was damp. Turns out it the carpets were old and the foam backing had deteriorated and that was the source of the smell. As Woody says, probably a bit of mould in there as well. New carpets and underlay solved it.
You beat me to it, exactly what I was going to suggest. We had the same with old carpets, the underlay under our 30-year old carpets was foamed rubber, which is a natural biodegreadable product, i.e. micro-organisms will eat it, live in it and produce smells. The underlay under ours was a woven top sheet with just fine powder underneath where the foam should have been when I took it up, like very fine brown sand.

I don't think we know whether the house is rented or bought. If rented then it would be reasonable to report it to the landlord and ask them to check and/or replace the underlay. If bought then time for some spending and effort.
 
Thanks everyone for those suggestions. Never occurred to me that it could be the carpets degrading, although I did think it could be that spores had set up home in the carpets, and presumably if the damp is from beneath and the mould is in the backing, that explains why the carpet cleaning attempts have made such little difference. Had it been our own house then we'd probably have had the carpet up by now (at least to inspect underneath) but with it being a rental, we're probably best off not going down that route ourselves. :) Sounds like it's time to get back onto the landlords to see what they're prepared to do about it, given that we've tried everything we can reasonably think of.
 
So, if anyone has knowledge or experience with this kind of issue - suggestions of things to try or potential causes to investigate - I'd be grateful for any advice.
Had the same problem with the MIL's house. Occasionally a damp smell but our clothes smelt musty after spending any amount of time in there. Looked everywhere for leaks. Been happening for some considerable time (18+ months) but last week we found a small leak that had been leaking for some time in the hot water cylinder. It had turned the insulating jacket to mush and a few towels that were at the back of it were absolutely sodden as well as the floorboards soaked through. She had it replaced yesterday with a nice new fully insulated one. Hopefully that might cure it when things dry out. Fingers crossed.
 
Thanks everyone for those suggestions. Never occurred to me that it could be the carpets degrading, although I did think it could be that spores had set up home in the carpets, and presumably if the damp is from beneath and the mould is in the backing, that explains why the carpet cleaning attempts have made such little difference. Had it been our own house then we'd probably have had the carpet up by now (at least to inspect underneath) but with it being a rental, we're probably best off not going down that route ourselves. :) Sounds like it's time to get back onto the landlords to see what they're prepared to do about it, given that we've tried everything we can reasonably think of.
I bought a carpet shampooer machine when we moved in ours. The clue was that the more I washed, the browner it got, as it was pulling that underlay powder up through the carpet.

Foamed underlay is crap, it probably only ever had a 10 year lifespan. It goes flat almost straight away, then just turns to dust. It's partly tree sap, so there are plenty of lifeforms that think it's delicious. Rubber crumb underlay is vastly better, this is what I'll be using in future. It's not foamed so much more stable, and I think it's made from tyres so more likely to be synthetic rubber (??).
 
Homes which stand locked up for periods do suffer like this. Decent ventilation immediately and then continue with minor ventilation there after.

Also sniff the carpet ........
 
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