WWilts Posted February 10, 2021 Share Posted February 10, 2021 Question: Can Dritherm mineral wool slabs be used with block inner and outer leaves, if thin joint blockwork is used? Any serious potential downsides? Any more economical / buildable way of cavity wall insulation if thin joint blockwork used for inner & outer leaves? Thanks Context: Need to control costs, for better or worse. Not forever home. Non-masonry options ruled out for various reasons. Site foreman, scaffolding costs etc all increase with duration of build/delays. So, for better or worse, duration of build is important consideration. SAP pass with wall U value 0.25, airtightness 4.0, floor over slab insulation 100 mm Celotex Link to comment Share on other sites More sharing options...
A_L Posted February 10, 2021 Share Posted February 10, 2021 @WWilts, Dritherm Cavity slabs are rated for 'full fill'. Silver/Graphite/Grey bonded EPS bead, conductivity 0.033/0.032W/mK with any block with a thermal resistance less/equal to 0.18W/m.K would get to your U-value. i.e. 100mm block/100mm bonded bead/100mm block. It could possibly be top filled. 1 Link to comment Share on other sites More sharing options...
PeterW Posted February 10, 2021 Share Posted February 10, 2021 Bin the thin joint if you want fast (as I have said before) Are you sure that is the wall figure or the weighted wall figure when including the windows...?? 1 Link to comment Share on other sites More sharing options...
WWilts Posted February 10, 2021 Author Share Posted February 10, 2021 7 hours ago, PeterW said: Are you sure that is the wall figure or the weighted wall figure when including the windows. My guess is wall figure Link to comment Share on other sites More sharing options...
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