Re Loft space humidity and its bearing on the moisture content of the timbers therein.
*This* indicates that providing relative ambient humidity is <75%, the timbers will equalise to no more than 15% moisture content.
(Excluding leaks/ingress, and vapor entering loft through ceilings/around lights etc). Am I reading it right?
*
http://en.wikipedia.org/wiki/Equilibrium_moisture_content
*
Having just had a new roof:
Ancient pan tiles 'changed to' modern better fitting tiles without gaps/cracks.
Bituminous felt 'changed to' breathable felt.
Eaves fully stuffed with insulation 'changed to' eaves vents all round.
No vents in soffits 'changed to' vented soffits all round.
I found ceiling joists circa 15% moisture content on top, and around 11 % at their sides which were covered by insulation between joists. I expected reverse pattern as moisture laden air if coming up through ceiling would dampen the covered parts of the timbers, but not so?
Few areas with woodworm were all 19-21% moisture readings, apart from a few that are presumably old exits and inactive now..
1930's Semi & not a fan/believer of spraying BTW.
*This* indicates that providing relative ambient humidity is <75%, the timbers will equalise to no more than 15% moisture content.
(Excluding leaks/ingress, and vapor entering loft through ceilings/around lights etc). Am I reading it right?
*
http://en.wikipedia.org/wiki/Equilibrium_moisture_content
*
Having just had a new roof:
Ancient pan tiles 'changed to' modern better fitting tiles without gaps/cracks.
Bituminous felt 'changed to' breathable felt.
Eaves fully stuffed with insulation 'changed to' eaves vents all round.
No vents in soffits 'changed to' vented soffits all round.
I found ceiling joists circa 15% moisture content on top, and around 11 % at their sides which were covered by insulation between joists. I expected reverse pattern as moisture laden air if coming up through ceiling would dampen the covered parts of the timbers, but not so?
Few areas with woodworm were all 19-21% moisture readings, apart from a few that are presumably old exits and inactive now..
1930's Semi & not a fan/believer of spraying BTW.