Thorfun Posted March 4, 2022 Share Posted March 4, 2022 visited my local BM trade fair this morning and was chatting to the Rockwool rep and when I told him I went glass wool as Rockwool didn't do a 0.032W/m.K batt (0.035W/m.K is the best they currently offer) he said that it was in development and should be available in about 6 months. obviously, salesmen can't always be trusted but at least they're working on the product to give an alternative for those of us that want that little better U-value. I did tell him it was too late for us though but he gave me a free beanie hat so I went away happy. 🙂 Link to comment Share on other sites More sharing options...
SteamyTea Posted March 4, 2022 Share Posted March 4, 2022 1 hour ago, Thorfun said: Rockwool didn't do a 0.032W/m.K batt (0.035W/m.K Is that really enough of a difference. 0.02W.m-2.K-1 on a 150mm of insulation. That is lost in noise and fitting errors. Link to comment Share on other sites More sharing options...
ProDave Posted March 4, 2022 Share Posted March 4, 2022 23 minutes ago, SteamyTea said: Is that really enough of a difference. 0.02W.m-2.K-1 on a 150mm of insulation. That is lost in noise and fitting errors. I make in 0.003 m-2.K-1 better But on a .032 m-2.K-1 product, that is an improvement of about 9% so more than you might think. Link to comment Share on other sites More sharing options...
saveasteading Posted March 4, 2022 Share Posted March 4, 2022 22 minutes ago, SteamyTea said: That is lost in noise and fitting errors. But the same logic apples to any product. But if that really is for batts, not rolls, then I reckon they are fitted with fewer errors, as they have to stack closely or they go out of module and create more work,,,so are done properly . usually. And 0.03 / 0.035 is an improvement of 9% which to me is good in any product. Link to comment Share on other sites More sharing options...
SteamyTea Posted March 4, 2022 Share Posted March 4, 2022 9% per metre, not at 150mm. But my mental arithmetic may be wrong as doing something else at moment. R = 0.15 (m) / 0.035 (k) R = 4.286 U = 1 / 4.286 U = 0.233 R = 0.15 (m) / 0.032 (k) R = 4.288 U = 1 / 4.288 U = 0.233 Is that right? Link to comment Share on other sites More sharing options...
BotusBuild Posted March 4, 2022 Share Posted March 4, 2022 m-2 is "per metre square", not per metre of depth? If I'm right, then the 9% improvement is irrelevant of how thick the slabs are Link to comment Share on other sites More sharing options...
saveasteading Posted March 4, 2022 Share Posted March 4, 2022 I would like 9% improvement in product or efficiency any time. That makes the whole project 9% cheaper, right?. Link to comment Share on other sites More sharing options...
saveasteading Posted March 4, 2022 Share Posted March 4, 2022 27 minutes ago, SteamyTea said: R = 0.15 (m) / 0.032 (k) R = 4.288 U = 1 / 4.288 U = 0.233 Faulty calculator there R=4.68 U = 0.21 .21/.23 = 0.91 Link to comment Share on other sites More sharing options...
SteamyTea Posted March 4, 2022 Share Posted March 4, 2022 18 minutes ago, saveasteading said: Faulty calculator there R=4.68 U = 0.21 .21/.23 = 0.91 That is where it is then. But eyesight, or fat fingers. Link to comment Share on other sites More sharing options...
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