Recent content by Piggery

Thanks Roofer. The Dormer problem is new, I am assuming that air movement to vent the flat roof used to rely on the draughty loft. Now that the loft area is reroofed with (Tyvek) underfelt I am guessing that there is insufficient air movement to keep the underside of the flat roof condensation...

Hi Mr Winston. Thanks for your comments. The sag varies between 2 & 20mm - roofing does not apear to be a precise art! However, the Dupont surveyors seemed perfectly happy with the installation and took some samples for testing, which proved OK. I have a normal open loft space with a flat...

Thanks for that. I have fastidiously checked for leakages. Kitchen & bathrooms always have extraction fans on when in use. The condensation is worst when there is a frost i.e. when the moisture vapour is frozen into the Tyvek - I guess it is no longer permeable under these conditions. I think I...

2 years ago we had a new slate roof to our 1930's bungalow with tyvek underfelt.No soffit or ridge vents were fitted, we were told tyvek is breathable and vents not required. During frosty weather significant condensation occurs on underfelt, dripping on to loft insulation. Dupont/Tyvek...