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Mouldy 'Marley' floor tiles under carpet


 
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welsford46

from United Kingdom

Joined: 18 Oct 2006
Posts: 86
Location: Norwich,
United Kingdom

PostPosted: Sun Mar 23, 2008 10:57 am Reply with quote

Hi I'm in the process of re-doing a downstairs bedroom in our 1960s chalet.

The room has always smelt a bit (blamed it on the previous elderly occupiers). I took the carpet up and noticed a thin covering on mould on the 'Marley' style floor tiles underneath.

Should I remove the floor tiles before a new carpet/underlay is installed or should the floor be treated in any way?

Any advice much appreciated thank you.

Rich
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JerryM

from United Kingdom

Joined: 20 Nov 2007
Posts: 466
Location: Cheshire,
United Kingdom

PostPosted: Fri Mar 28, 2008 6:39 pm Reply with quote

I would expect that the floor has no damp proofing. new build concrete floors have a plastic sheet "dpm" underneath.

what to do depends on how bothered u are and how stable the floor is (is it still moving/sinking or pretty well compacted and not going anywhere).

you could dig up and put a new floor in (biggish job), if the sub floor is fairly stable then a pour on dpm would be good. the simplest would be to just put a dpm sheet down before relaying carpet.

the only slight hesitation with the latter is that with a dpm down the moisture will try to go elsewhere ie up the walls and potentially cause problems their if the house has not been damp proofed. i don't think is a significant risk given it's been carpet/underlay before which will have trapped the moisture to a certain extent.

i'd probably give just the dpm ago to start with and see how it goes. obviously the other options are better solutions but more time and money.
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JohnD

from United Kingdom

Joined: 15 Nov 2005
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Location: Hampshire,
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PostPosted: Fri Mar 28, 2008 8:32 pm Reply with quote

we are guessing you have a concrete floor and it is more than 20-30 years old. Is that right?

was the carpet a rubber-backed one that prevents moisture from drying out, so keeping the undertiles damp?
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welsford46

from United Kingdom

Joined: 18 Oct 2006
Posts: 86
Location: Norwich,
United Kingdom

PostPosted: Fri Mar 28, 2008 9:37 pm Reply with quote

Yes - you are right in your assumption of a concrete floor.

The concrete floor seems in reasonable condition although a few of the marley tiles have cracked/come away - but not to any great extent.

The mould isn't rife but the room always did niff a bit.

Thanks for suggestions...there was paper under the rubber backed carpet..would underlay and a wool carpet be better.

I don't mind taking the tiles up but no sure if there might be some form of bitumen residue

Thanks
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JerryM

from United Kingdom

Joined: 20 Nov 2007
Posts: 466
Location: Cheshire,
United Kingdom

PostPosted: Thu Apr 03, 2008 6:33 pm Reply with quote

Quote:
would underlay and a wool carpet be better.


No. u need to stop the damp at the floor level before putting down any soft furnishings ie laminate, underlay, carpet etc. otherwise the niff will be back.

Quote:
I don't mind taking the tiles up but no sure if there might be some form of bitumen residue


bitumen is a good damp proofing material. as long as it's not cracked then i'm now not sure what would be causing the niff.

i feel options are repair the odd tile with mortar and lay a dpm over the top before soft furnishings or take up tiles put down liquid dpm and then soft furnish.
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