I have a detached garage, built out of some sort of blocks back in the 1950's or before even. It has a pitched roof with corrugated asbestos/cement sheets on it
Every winter my garage turns into a swimming pool and everything goes rusty. Every summer it's like an oven.
I've tried attacking the damp in many ways over the years. Everyone would tell me I needed a new roof. Sod that, too expensive i'd say. I've tried tanking the walls in cementitious slurry, drilling holes in the base of the walls to insert those damp rod thingies, sealed all the gaps in the corrugated roof with expanding foam, installed an extractor fan in the wall (which would run night and day in the winter until it packed up lol), painted the roof with water proofing roof paint, partially cladded the exterior with wood. Everything short of installing a new door (because there's a gap).
None of it has helped.
So my last ditch attempt will be to insulate the roof, using the 'cold roof' method. I'm hoping someone can advise. Even if it's to suggest insulating is the wrong thing to do and to go with a new roof instead...
The idea is to place 25mm celotex/kingspan in between the wooden beams, leaving an inch or so air gap between it and the roof. This will leave the lower half of the beams exposed, but completely airtight.
General consensus says that the gap between the insulation and the roof should be ventilated to prevent condensation. Surely if it was airtight, there would be no way for moisture to get in in the first place? I'm also wondering why it would even matter, considering it will be on the side I give no flying f's about?
Please see pics.
So firstly, am I on the right track? And secondly, am I ******* in the wind?
Every winter my garage turns into a swimming pool and everything goes rusty. Every summer it's like an oven.
I've tried attacking the damp in many ways over the years. Everyone would tell me I needed a new roof. Sod that, too expensive i'd say. I've tried tanking the walls in cementitious slurry, drilling holes in the base of the walls to insert those damp rod thingies, sealed all the gaps in the corrugated roof with expanding foam, installed an extractor fan in the wall (which would run night and day in the winter until it packed up lol), painted the roof with water proofing roof paint, partially cladded the exterior with wood. Everything short of installing a new door (because there's a gap).
None of it has helped.
So my last ditch attempt will be to insulate the roof, using the 'cold roof' method. I'm hoping someone can advise. Even if it's to suggest insulating is the wrong thing to do and to go with a new roof instead...
The idea is to place 25mm celotex/kingspan in between the wooden beams, leaving an inch or so air gap between it and the roof. This will leave the lower half of the beams exposed, but completely airtight.
General consensus says that the gap between the insulation and the roof should be ventilated to prevent condensation. Surely if it was airtight, there would be no way for moisture to get in in the first place? I'm also wondering why it would even matter, considering it will be on the side I give no flying f's about?
Please see pics.
So firstly, am I on the right track? And secondly, am I ******* in the wind?