Al T Posted April 5, 2023 Share Posted April 5, 2023 Hi everyone. I'm after some advice. I've just had an extension built that has an unheated garage with a bedroom above it. I know this can cause the bedroom to be cold. What is the best way to insulate the garage ceiling? I was going to use 200mm of the rock wool. Do i need to leave an air gap between the top of the insulation and the bedroom floor? TIA Al Link to comment Share on other sites More sharing options...
Thorfun Posted April 5, 2023 Share Posted April 5, 2023 if you contact Rockwool (or whatever manufacturer's insulation you choose to use) they can perform a condensation analysis for you. this should give you peace of mind that you're not making any mistakes! 1 Link to comment Share on other sites More sharing options...
Bemak Posted April 5, 2023 Share Posted April 5, 2023 ensure as well that there is adequate fire stopping between the bedroom and garage. I think it needs to be 1 hour from memory. Link to comment Share on other sites More sharing options...
Iceverge Posted April 5, 2023 Share Posted April 5, 2023 No air gap needed. Full fill rockwool batts would be good. What kind of flooring do you have upstairs? It's important to seal any holes in this as drafts will negate the effect of any insulation. 1 Link to comment Share on other sites More sharing options...
nod Posted April 5, 2023 Share Posted April 5, 2023 200 mil of wool and two layers of 15 mil fire line plasterboard is standard across all new builds 1 Link to comment Share on other sites More sharing options...
ProDave Posted April 5, 2023 Share Posted April 5, 2023 8 minutes ago, nod said: 200 mil of wool and two layers of 15 mil fire line plasterboard is standard across all new builds Just to add for those that don't know, with staggered joints between the two layers of fireline. 1 Link to comment Share on other sites More sharing options...
nod Posted April 5, 2023 Share Posted April 5, 2023 Most definitely On both layers I normally use 3000 x 1200 boards Link to comment Share on other sites More sharing options...
Blooda Posted April 5, 2023 Share Posted April 5, 2023 Don't forget your penetrations 😜 Plenty of fireproofing solutions here:- Envirograf – The passive fire protection experts since 1983 Link to comment Share on other sites More sharing options...
Thorfun Posted April 5, 2023 Share Posted April 5, 2023 1 hour ago, nod said: I normally use 3000 x 1200 boards bet they're bloody heavy! Link to comment Share on other sites More sharing options...
Al T Posted April 5, 2023 Author Share Posted April 5, 2023 5 hours ago, Bemak said: ensure as well that there is adequate fire stopping between the bedroom and garage. I think it needs to be 1 hour from memory. Yes I'll be plasterboarding the garage ceiling with the fireline plasterboard Link to comment Share on other sites More sharing options...
Al T Posted April 5, 2023 Author Share Posted April 5, 2023 4 hours ago, nod said: 200 mil of wool and two layers of 15 mil fire line plasterboard is standard across all new builds I thought it was either 2 layers of normal plasterboard or 1 layer of fireline stuff Link to comment Share on other sites More sharing options...
nod Posted April 5, 2023 Share Posted April 5, 2023 All the sites I do are two layers of Fire line Crazy to skrimp on something like that 1 Link to comment Share on other sites More sharing options...
ProDave Posted April 5, 2023 Share Posted April 5, 2023 3 hours ago, Thorfun said: bet they're bloody heavy! The only boarding I had to hire help for. The rest of the entire house with standard 12.5mm was doable with just me, SWMBO and 2 dead men. Link to comment Share on other sites More sharing options...
Thorfun Posted April 5, 2023 Share Posted April 5, 2023 8 hours ago, ProDave said: The only boarding I had to hire help for. The rest of the entire house with standard 12.5mm was doable with just me, SWMBO and 2 dead men. Can’t wait to do mine!! Link to comment Share on other sites More sharing options...
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