Tue, 19 Dec 2023 08:29:47 +0000 http://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302415#Comment_302415 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302415#Comment_302415 Wed, 12 Jul 2023 12:12:54 +0100 CJT
Building a Sips house with 142mm kingspan TEK, adding 50mm kingspan to the interior gives me 1.3 (W/m2k). I have been getting quotes for windows with 0.8 which seem expensive. Am i going overboard at 0.8 ? considering the TEK is 1.3 ? I am happy to spend the money if its well spent.

Thank you.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302417#Comment_302417 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302417#Comment_302417 Wed, 12 Jul 2023 12:26:42 +0100 fostertom http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302418#Comment_302418 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302418#Comment_302418 Wed, 12 Jul 2023 12:36:59 +0100 djh Posted By: CJTBuilding a Sips house with 142mm kingspan TEK, adding 50mm kingspan to the interior gives me 1.3 (W/m2k). I have been getting quotes for windows with 0.8 which seem expensive. Am i going overboard at 0.8 ? considering the TEK is 1.3 ? I am happy to spend the money if its well spent.I suspect you have an error in your figures. 0.13 W/m²K seems a much more likely U-value for the wall than 1.3.

0.8 is a good figure for the U-value of a window. It's about what mine are. Is that the whole window value, or a value for the glazing? For myself I think the money would be well spent if they are at a good price, but it depends on what the rest of the building is like, and what your overall aims and budget are.

edit: to add that the U-value of a window is not the only criterion to look at. The quality of construction and especially the hardware is important. And stability of course. The finish is important in terms of how much maintenance will be required. Airtightness is very important.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302419#Comment_302419 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302419#Comment_302419 Wed, 12 Jul 2023 13:00:02 +0100 CJT Posted By: fostertomRussell Timbertech's Europe-sourced U1.1 3G timber windows are cheapest by far (and good), also do basically same design uprated to PH grade at quite a premium price. I'd a thought U1.1 would be right for you.

Thank you. I have tried contacting Russell previously with no answer, I will try again. Your answer fits in with my thinking.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302420#Comment_302420 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302420#Comment_302420 Wed, 12 Jul 2023 13:04:21 +0100 CJT Posted By: djhI suspect you have an error in your figures. 0.13 W/m²K seems a much more likely U-value for the wall than 1.3.


My mistake ! 0.13 I intend to concentrate on airtightness. My aim is to have a comfortable house with low running costs, Budget isn't a massive issue but i feel i have to be sensible as well considering i am not getting any younger. Thank you.]]> http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302421#Comment_302421 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302421#Comment_302421 Wed, 12 Jul 2023 14:35:06 +0100 djh http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302423#Comment_302423 http://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=17896&Focus=302423#Comment_302423 Wed, 12 Jul 2023 16:29:34 +0100 fostertom If the walls are U.13 nominal, then prob U.8 windows would be justified.]]>