richo106 Posted February 16, 2023 Share Posted February 16, 2023 Hi All All being well my shell will be complete in the next 8-10 weeks with all windows, doors, roofs etc installed I am having a cold roof space When would be a good time/at what stage to do a first DIY air test? All my windows/doors will be taped from frame to blockwork I have had traditional joists sat on the inner block, these have been sealed round with the mortar but aware of shrinkage etc.. what is the best way to combat this? Air tight paint sealing all edges? My floor make up will be slab, 200mm PIR and then 50mm screed....is this best to air tight paint the perimeter junction? What is the best foam to use to seal cables, pipes and waste pipes going through the brick and block? I was thinking about taping pipes also My biggest concern is the first floor ceiling, i will have many spot lights and MVHR ducts travelling through it, I am happy to tape all ducts. Do I need a membrane stapling to joists before plasterboarding? Any advice on any issues raised much appreciated Many Thanks Link to comment Share on other sites More sharing options...
ProDave Posted February 16, 2023 Share Posted February 16, 2023 As you are still in construction phase, is it too late to change it for a warm roof? That puts all the insulation and air tightness at roof level and makes all the internal work, ducts, lights so much easier, and you get a nice warm loft space as well. That is right up there at the top of the "I am glad I did that" list. Link to comment Share on other sites More sharing options...
richo106 Posted February 16, 2023 Author Share Posted February 16, 2023 We are yes, well roof is going on in about 4 weeks i have looked at warm roofs but think I won’t be able to afford it unfortunately What is the make up of your warm roof if you don’t mind me asking? Many Thanks Link to comment Share on other sites More sharing options...
ProDave Posted February 16, 2023 Share Posted February 16, 2023 Strictly speaking mine is referred to as hybrid. It has 100mm of wood fibre board over the rafters and then 200mm full fill insulation between the rafters. It means the entire loft space is inside the insulated air tight envelope so you don't have to worry about insulating mvhr ducts etc or ceiling penetrations. 1 Link to comment Share on other sites More sharing options...
richo106 Posted February 16, 2023 Author Share Posted February 16, 2023 25 minutes ago, ProDave said: Strictly speaking mine is referred to as hybrid. It has 100mm of wood fibre board over the rafters and then 200mm full fill insulation between the rafters. It means the entire loft space is inside the insulated air tight envelope so you don't have to worry about insulating mvhr ducts etc or ceiling penetrations. Does sound good but expensive haha. With an ridiculously stretched budget that might be a stretch too far but that would be ideal Link to comment Share on other sites More sharing options...
jayc89 Posted February 16, 2023 Share Posted February 16, 2023 I'm doing a retrofit. We have a 150 year old roof which I don't plan on ripping up any time soon. I plan on laying Intello membrane across the underside of the roof joists, taping to the insulation/wall airtightness detail, then studding off a service void for lighting cables etc as to not penetrate into the cold loft, the only penetration we will have is for the MVHR valve coming into each room, which can be appropriately detailed. Standard insulation rolls will be applied between and over the joists in the loft, which will overlap with the wall insulation around the perimeter (whilst ensuring the eaves aren't blocked to allow for sufficient ventilation) Not perfect, but a damn sight better than what we currently have and short of replacing the roof, probably the best we can do. Link to comment Share on other sites More sharing options...
Dave Jones Posted February 16, 2023 Share Posted February 16, 2023 put a fan (normal desktop 12" will do) in a doorway/window and seal around it to the frame with bin bags to depressurize the house then go draught hunting. Link to comment Share on other sites More sharing options...
IanMcP Posted February 20, 2023 Share Posted February 20, 2023 On 16/02/2023 at 16:26, Dave Jones said: put a fan (normal desktop 12" will do) in a doorway/window and seal around it to the frame with bin bags to depressurize the house then go draught hunting. did you actually do this ? Link to comment Share on other sites More sharing options...
Jenki Posted February 20, 2023 Share Posted February 20, 2023 This might be of use. Link to comment Share on other sites More sharing options...
Gill Posted February 20, 2023 Share Posted February 20, 2023 (edited) @IanMcP from my reading around here there is quite folks making their own home made blower test kit. I want to rig up one soon - bookmarked this thread that has some details : Edit - what @Jenkisaid above min before me. 😁 Edited February 20, 2023 by Gill 1 Link to comment Share on other sites More sharing options...
Jenki Posted February 20, 2023 Share Posted February 20, 2023 6 minutes ago, Gill said: Edit - what @Jenkisaid above min before me. 😁 You snooze you lose😂 1 Link to comment Share on other sites More sharing options...
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