I would appreciate your thoughts. Please see attached photograph, sorry, but is not a finished build picture.
I have an extension with a central box gutter, on 2 occasions in the last week we have noticed a small (100mm dia) stain on the inside plasterboard (always the same place). This appears to only occur the next day following very cold nights of -5/6 centigrade.
The roof structure from memory is tile, batten, breathable membrane, roof structure filled with 150mm on Celotex insulation, plasterboard.
I do not think this is a leak as a result of rain, but condensation occurring in the roof space. Is that possible? What is the likely cause? How would it be resolved?
Many thanks
I have an extension with a central box gutter, on 2 occasions in the last week we have noticed a small (100mm dia) stain on the inside plasterboard (always the same place). This appears to only occur the next day following very cold nights of -5/6 centigrade.
The roof structure from memory is tile, batten, breathable membrane, roof structure filled with 150mm on Celotex insulation, plasterboard.
I do not think this is a leak as a result of rain, but condensation occurring in the roof space. Is that possible? What is the likely cause? How would it be resolved?
Many thanks