Donna M

Hi, i was only able to access one area to see the underside of the roof like this. There were other areas across the roof where I noticed drips, and two valleys have damp issues, but there is no sagging in the timbers as far as I could see. elsewhere there has been stiff insulation installed under the rafters (as in loft side) with a foil backing (facing into the loft space) and then a layer of plasterboard. The plaster board is getting wet in some locations but not uniformly across the whole roof. There did seem to be a gap between the insulation and the roof slates so I think it is ok ventilation wise. if it is getting wet on the inside of the slates periodically with stormy weather is that essentially ok provided he timbers dry out when it is a sunnier day? If it is a problem is there a rule of thumb that says how long timbers can be getting wet like this? Does rot set in pretty quickly? thanks for your responses!

Hi all, This slate roof is 150 yeas old. The structure appears to be sound and well built, the rafters are wet when it is stormy weather, tiles seem to get wet at corners of tiles as in picture. Is this porous slate or condensation, or something else ? Any advice on next steps is a reroof inevitable? Thanks all D