Hi.
I have a 1930's semi. The roof is tiled directly onto the timbers, no felt in those days I gather. There is wadding / horsehair & plaster type mix that is used throughout the roof on the underside of the joins between tiles.
I want to line the underside of the roof (or part of the roof) to prevent the heavy rain of dust and dirt that comes down from ruining anything I store up there.
Whatever I use will need to be fixed to the underside of the roof timbers.
A neighbour has used plastic sheeting for this purpose, however I'm nervous of restricting ventilation to the timbers by doing the same.
I've bought some breathable roofing membrane from Screwfix (Item # 95917), which is described as:
"Breathable, high-performance pitched rool underlay made from polyolefin materials, producing high vapour permability and water-resistance. User friendly.
* Eliminates Roof Space Ventilation
* Energy-Saving"
The idea is to staple gun this to the underside of the roof timbers, for about two thirds of the roof.
My question is ... what considerations should I make when fixing up the membrane, ie: is it better to have the waterproof side on the inside or outside face... I can see arguments for both ways and keep going round in circles.
The last thing I want to do is introduce any kind of mould problem to the roof timbers.
Any advice would be most appreciated.
Thanks very much.
