wozza Posted August 28, 2019 Share Posted August 28, 2019 Hi All, Our floor make up was / is going to be 100mm Concrete, 100mm PIR and 75mm Screed We are considering increasing the insulation to 120mm and reducing the screed to 55mm The UFH pipework will be fixed directly to the PIR What are the pros and cons apart from installation time of using a 120mm PIR board vs using 20mm and 100mm boards combined? Link to comment Share on other sites More sharing options...
nod Posted August 28, 2019 Share Posted August 28, 2019 To thin for semi dry screed Ok for liquid screed 1 Link to comment Share on other sites More sharing options...
wozza Posted August 28, 2019 Author Share Posted August 28, 2019 14 minutes ago, nod said: To thin for semi dry screed Ok for liquid screed Thanks Nod, I should have said that the original 75mm screen was most likely going to be a sand / cement, the new 55mm screed will be liquid screed. Link to comment Share on other sites More sharing options...
PeterW Posted August 28, 2019 Share Posted August 28, 2019 Why not use a 50mm concrete blinding and then 130mm PIR and 100mm concrete over the lot ..?? 1 Link to comment Share on other sites More sharing options...
Oz07 Posted August 28, 2019 Share Posted August 28, 2019 Or a well compacted sub base and structural concrete slab top? Comfortably get 150mm insu then. To answer your question OP you might overpay for 120mm sheets. I'd price up 100mm and 25mm (if can lose 5mm) as quite common sizes. Otherwise if 120mm in one board same price then just go with that 1 Link to comment Share on other sites More sharing options...
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