March 4, 20224 yr 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. 🙂
March 4, 20224 yr 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.
March 4, 20224 yr 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.
March 4, 20224 yr 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.
March 4, 20224 yr 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?
March 4, 20224 yr 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
March 4, 20224 yr I would like 9% improvement in product or efficiency any time. That makes the whole project 9% cheaper, right?.
March 4, 20224 yr 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
March 4, 20224 yr 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.
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