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Thanks. Have put in 10 lap vents now on what’s accessible (ie only in the eves storage, which is one side of the roof- the rest is plastered over for the attic room). No ridge vents whatsoever. Is only one 25mm ridge vent usually sufficient, or is is the case of the more the merrier?

Thanks, your link to Monarflex specifically states that ventilation must be provided at eaves and ridge level, neither of which were installed when the previous owner did the loft/attic conversion in 1997. Any thoughts on whether a PIV system might help? Looking at the marketing material they...

Sorry that was a typo.. it’s actually 100mm!

Yep 10mm air gap between the insulation and underlay, all the way up from eaves to ridge. That’s promising to hear we can just look at ridge vents- thank you. Think it’s worth monitoring the situation for the time being now the soffit and vented tiles have been installed? Have a hygrometer up...

Maybe the guys meant to say PVC..?

Hi all Having a problem with dampness in our attic room. Opened up the eaves storage (which was filled with junk) for the first time in 5 months to find mould on some of the rafters. Have now had soffit vents and tile vents installed, but the installers have advised that as the existing...