Damp patch on floorboards

[David937]

Hi all,

We're having a bit of an issue in our 1930s semi which has a suspended timber floor in 2 rooms downstairs.

Recently, when new flooring was fitted and the old carpet and underlay was lifted the fitter spotted a damp patch on the floor towards the door of the living room, it has been left for now until the source of damp is fixed. The boards just feel a touch damp when you feel them.

There are no cold or hot water pipes running there, there are central heating pipes but the pressure has been steady for years so I doubt it's the heating system. According to the fitter there isn't enough sub floor ventilation? There are vents under the bay window at the front of the property and at the rear of the property there are vents under the patio doors (part of an extension) which apparently are piped under the concrete floor of the extension to under the existing floor.

The hallway that the living rooms leads into has concrete floors, there are no external walls nearby.

I would be grateful if you could give me any advise on this issue please? If any more information is needed, please ask.

Thanks

 

[^woody^]

According to the fitter there isn't enough sub floor ventilation?

Unlikely for a damp patch

Timber wont get any condensation damp, so any damp patch will be from a leak onto the timber, or moisture soaking across or up into the timber. Options are limited

If you have not spilt anything then you need to look under the board for the source.

It not clear what door you mean, but if there is a wall, especially an external wall or solid floor next to the timber then that needs investigating

 

[David937]

According to the fitter there isn't enough sub floor ventilation?

Unlikely for a damp patch

Timber wont get any condensation damp, so any damp patch will be from a leak onto the timber, or moisture soaking across or up into the timber. Options are limited

If you have not spilt anything then you need to look under the board for the source.

It not clear what door you mean, but if there is a wall, especially an external wall or solid floor next to the timber then that needs investigating

Ah okay, will have to have a look under the floor. It's an internal door and an internal wall (not sure of construction but it could be lathe and plaster). The floor right next to it is a solid concrete floor.