Hello
I'm planning on converting an external garage to a well insulated room.
My initial plan was to replace the old roof with a steel roof and have a cold roof with the insulation layer beneath the joists. However I don't believe this is going to be possible due to the lack of height at the back of the garage compared to the height of the door. There simply isn't enough room for 50mm of ventilation space + 100m of insulation + 12.5 plasterboard.
The second option was to opt for a warm roof. With a layer of 18mm OSB3 (or ply) above the joists, a vapour barrier, 100mm insulation, another 18mm of OSB3 and then EPDM rubber to seal it off. Inside I'd create a false 'flat' ceiling to hide the joists and to hold the lights, etc. The problem here is that the joists will run from the outside through the warm envelope of the building creating cold bridges, though I know wood isn't the worse material for this.
I thought perhaps I could put a layer of insulation over the joists outside, however I don't think this would work very well and would need to be hidden within the eaves making them really big. The other potential option I consider was adding 25mm insulation around each joists within the garage, though I couldn't do this above the joist obviously.
I'd be interested in hearing any thoughts or recommendations if anyone has any other ideas please?
Thanks
I'm planning on converting an external garage to a well insulated room.
My initial plan was to replace the old roof with a steel roof and have a cold roof with the insulation layer beneath the joists. However I don't believe this is going to be possible due to the lack of height at the back of the garage compared to the height of the door. There simply isn't enough room for 50mm of ventilation space + 100m of insulation + 12.5 plasterboard.
The second option was to opt for a warm roof. With a layer of 18mm OSB3 (or ply) above the joists, a vapour barrier, 100mm insulation, another 18mm of OSB3 and then EPDM rubber to seal it off. Inside I'd create a false 'flat' ceiling to hide the joists and to hold the lights, etc. The problem here is that the joists will run from the outside through the warm envelope of the building creating cold bridges, though I know wood isn't the worse material for this.
I thought perhaps I could put a layer of insulation over the joists outside, however I don't think this would work very well and would need to be hidden within the eaves making them really big. The other potential option I consider was adding 25mm insulation around each joists within the garage, though I couldn't do this above the joist obviously.
I'd be interested in hearing any thoughts or recommendations if anyone has any other ideas please?
Thanks
