Thedreamer Posted September 21, 2018 Share Posted September 21, 2018 Evening folks, Just after an idea of what type of timber you have used to hold up insulation on joist? And type of screws? Any pictures would be greatly appreciated. Link to comment Share on other sites More sharing options...
Declan52 Posted September 21, 2018 Share Posted September 21, 2018 You can use Rockwool that is much denser than the Normal attic version that once cut to size it will sit there and won't say. Same goes if you intend to cut up sheets of pir. It's cut and squeezed in so it's tight against both sides. Any gaps can be filled with expanding foam. Link to comment Share on other sites More sharing options...
Redoctober Posted September 21, 2018 Share Posted September 21, 2018 Not sure about insulation being nailed / screwed to the joists but like @Declan52 has said, insulation usually goes in between the joists - that is certainly the way we did ours. See image - Nothing required to keep it in place as the width of the insulation came in at the same width of the gap between the joists. Link to comment Share on other sites More sharing options...
Thedreamer Posted September 21, 2018 Author Share Posted September 21, 2018 (edited) Sorry should have said it's for our suspended floor. Having a layer of Kingspan and then Frametherm wool on top. Timber is to support the kingspan, which will fit snugly in the joists but will still need some support. Edited September 21, 2018 by Thedreamer Link to comment Share on other sites More sharing options...
ProDave Posted September 21, 2018 Share Posted September 21, 2018 Type of joist? Our ground floor has JJI joists and I cut sheets of OSB to lay in the bottom to support the insulation. Link to comment Share on other sites More sharing options...
Thedreamer Posted September 21, 2018 Author Share Posted September 21, 2018 4 minutes ago, ProDave said: Type of joist? Our ground floor has JJI joists and I cut sheets of OSB to lay in the bottom to support the insulation. Just plain old wood joists. Did you use thin strips of OSB and attach with screws? Link to comment Share on other sites More sharing options...
ProDave Posted September 21, 2018 Share Posted September 21, 2018 2 minutes ago, Thedreamer said: Just plain old wood joists. Did you use thin strips of OSB and attach with screws? The OSB just sat in the bottom of the I beam. Does not help you though. Link to comment Share on other sites More sharing options...
nod Posted September 22, 2018 Share Posted September 22, 2018 11 hours ago, Thedreamer said: Evening folks, Just after an idea of what type of timber you have used to hold up insulation on joist? And type of screws? Any pictures would be greatly appreciated. Two 50 mil collated screw in each joist Link to comment Share on other sites More sharing options...
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