Hi All ,
Great forum BTW lots of lost hours reading many differing posts amazing what you can learn .
My situation is as follows .
I have a 1960's semi with a brick single skin attached garage with a concrete floor which slopes severely back to front approx 8" fall over 12' and a cold flat roof.the garage is sized at 7' wide by 25' long .
I am wanting to insulate the garage to make it warmer in the winter to use as a workshop /gym etc, but not a habitable room.
I have read as much as possible with regards to insulating and damp proofing but still have several questions which are as follows .
The roof ( whole can of worms this is !!) I have 19 4X2's running perpendicular to the length of the garage I think this means that if I insulate it with 50mm kingspan then dry line with foil backed plasterboard and leave a 50mm air gap above the insulation I will have to put in 34! vents (17 on each side)
which I am obviously trying to avoid.
Would it be permissible to run two lengths of 40mm waste pipe below the ceiling level with a t section and a small upright going to the ventilation space above the insulation at each joist space centre and vent it externally at either end of the garage or have a fan to push air through the pipes to take away any moisture. I do not want to drill through each timber as it will obviously weaken them
Or Is there anyway I can fully insulate the ceiling to make it a solid block of insulation then put a vapour barrier up and finally line it with plasterboard? as this will make it a lot simpler for my aching brain .
Lastly what is the minimum vent size I would require if i decide to drill through the sofit and bricks
If anyone can help with these questions I would be very grateful .
Many thanks in advance for any help and sorry for the multiple questions
Glenn
Great forum BTW lots of lost hours reading many differing posts amazing what you can learn .
My situation is as follows .
I have a 1960's semi with a brick single skin attached garage with a concrete floor which slopes severely back to front approx 8" fall over 12' and a cold flat roof.the garage is sized at 7' wide by 25' long .
I am wanting to insulate the garage to make it warmer in the winter to use as a workshop /gym etc, but not a habitable room.
I have read as much as possible with regards to insulating and damp proofing but still have several questions which are as follows .
The roof ( whole can of worms this is !!) I have 19 4X2's running perpendicular to the length of the garage I think this means that if I insulate it with 50mm kingspan then dry line with foil backed plasterboard and leave a 50mm air gap above the insulation I will have to put in 34! vents (17 on each side)
which I am obviously trying to avoid.
Would it be permissible to run two lengths of 40mm waste pipe below the ceiling level with a t section and a small upright going to the ventilation space above the insulation at each joist space centre and vent it externally at either end of the garage or have a fan to push air through the pipes to take away any moisture. I do not want to drill through each timber as it will obviously weaken them
Or Is there anyway I can fully insulate the ceiling to make it a solid block of insulation then put a vapour barrier up and finally line it with plasterboard? as this will make it a lot simpler for my aching brain .
Lastly what is the minimum vent size I would require if i decide to drill through the sofit and bricks
If anyone can help with these questions I would be very grateful .
Many thanks in advance for any help and sorry for the multiple questions
Glenn