Subfloor ventilation

[kg99p]

Victoria sandstone semi detached. When we moved in we repaired some joists with wet rot which were attributed to some leaking pipes which have been replaced. It’s a suspended timber floor with about 4ft from the earth to floorboards.

I’m monitoring moisture in the subfloor and relative humidity sits about 90% which seems high. Moisture readings in the joists are about 18-20%.

We have unimpeded airbricks at the front and back of the house. I’ve cleared a lot of rubbish from the subfloor space and cleared some debris around the airbricks.

Do I need to do anything else ? Humidity is high but I live in a wet place so perhaps that’s to be expected. How do I measure ventilation beyond just keeping an eye on the moisture in the joists ?

Thanks for any thoughts.

 

[fernicarry]

90% sounds about right for humidity given that its basically outdoor conditions. Its been pretty damp for the last few weeks.

I did a couple of quick checks here and got 19% and 17% moisture front and back. Seems high but again its outdoors. Pretty sure I don't have any issues in those spots so can only presume it's normal.

Sounds like you've done all the right things. So long as the joists are clear of any debris that could bridge them to the ground or the walls and no leaks then that's about best you can do.