I'm still deciding on which to do for an extension. Either block built or timber frame.
I'll be doing a warm roof with 140mm insulation. The vapor barrier on top of the 18mm osb board under the insulation. One thing that has been bothering me is the vapor barrier on the inside of the timber frame which will be over the insulation and under the plasterboard. When I come to ceiling height where it meets the joist, do I continue the vapor barrier on up to the underside of the osb board just stop at ceiling height.
This is one detail I can't find much information on the internet about. This is one detail I'll need to get right because after it's all plastered up and roof on, there's no going back. Would hate to do all this work then the moisture escaping to the underside of the osb board and creating sweating and ruining all my efforts. Everything else on the extension is straight forward for me however this is one detail I need to know before I proceed.
I'll be doing a warm roof with 140mm insulation. The vapor barrier on top of the 18mm osb board under the insulation. One thing that has been bothering me is the vapor barrier on the inside of the timber frame which will be over the insulation and under the plasterboard. When I come to ceiling height where it meets the joist, do I continue the vapor barrier on up to the underside of the osb board just stop at ceiling height.
This is one detail I can't find much information on the internet about. This is one detail I'll need to get right because after it's all plastered up and roof on, there's no going back. Would hate to do all this work then the moisture escaping to the underside of the osb board and creating sweating and ruining all my efforts. Everything else on the extension is straight forward for me however this is one detail I need to know before I proceed.