Garald Posted June 13 Share Posted June 13 (edited) Hi, I'm trying to model my wall in Ubakus, and I'm stuck because I can't find one of the materials. (Long story short: the wall is already insulated on the inside, with a mixture of traditional and reflective materials; I am considering insulating it on the outside.) 1. This is the wall as it stands now: From inside to outside (and top to bottom, within the diagram): BA18 plaster layer (18mm) 45mm BioFib trio unventilated air layer (R=0.53, supposedly) ATI PRO MULTI HPV (reflecting insulation) (40mm) ventilated air layer masonry wall of unknown composition and thickness, from the 1930s (well, I suppose I could estimate its thickness, but I have no idea of how to get an accurate measurement). The problem is that, while BioFib Trio is in Ubakus's database, ATI PRO MULTI HPV is not. Is there a close substitute? 2. I'm starting to get quotes from different artisans for the possible outside insulation. (My goal is to get an R of about 4 on the outside alone - in part because that way I might be able to get subsidies (finally)). Here are some options, all of which cost more than I expected (for a wall of about 72m^2 excluding windows): Business 1: 17621eur for rockwool (16 cm, R=4.55) Business 2: 14432eur for expanded polystyrene (14 cm , R=4.4) I should have an estimate from Business 3 soon. Are prices in the UK similar? I can provide some links with pictures so that people can tell me whether what these folks do looks like quality installations. (Also, is rock wool really eco-friendlier than polystyrene? What advantages that it pose, other than being fire-proof? Is polystyrene on the outside a hazard?) Edited June 13 by Garald Link to comment Share on other sites More sharing options...
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