Green Building Forum - Final Window Conundrum Thu, 25 Jun 2026 06:46:25 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309569#Comment_309569 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309569#Comment_309569 Tue, 28 Oct 2025 13:01:56 +0000 djh Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309570#Comment_309570 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309570#Comment_309570 Tue, 28 Oct 2025 13:11:42 +0000 Victorianeco Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309574#Comment_309574 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309574#Comment_309574 Wed, 29 Oct 2025 16:58:45 +0000 Victorianeco
"Good afternoon Gareth,



Thank you for your enquiry.



Unfortunately upon review of your job we must decline due to our current workload."]]> Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309581#Comment_309581 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309581#Comment_309581 Fri, 31 Oct 2025 07:43:17 +0000 Victorianeco
Nordan
Velfac
a few different SMART systems suppliers


The Senior Architectural systems supplier said the smallest they can do in 2G is 28mm (4-20-4) and their 3G they can price in (4-16-4-16-4)

I think we will go for a self install due to mounting in EWI envelope and I can ensure a bit more detail is spent on the fitment (and for my own enjoyment and satisfaction)

The question - Powder coating in RAL9005 (black) on a South facing elevation - will it fade?]]> Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309582#Comment_309582 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309582#Comment_309582 Fri, 31 Oct 2025 08:25:13 +0000 fostertom Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309583#Comment_309583 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309583#Comment_309583 Fri, 31 Oct 2025 11:35:09 +0000 djh I won't be whispering anything truly private on here, that's for sure.]]> Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309584#Comment_309584 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309584#Comment_309584 Fri, 31 Oct 2025 15:47:22 +0000 Victorianeco Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309585#Comment_309585 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309585#Comment_309585 Fri, 31 Oct 2025 16:00:11 +0000 fostertom Posted By: fostertomAlso to say that despite previous alerts about 16 being optimum gap, I generally do settle for 12 gap 3G, both with Russell's super-value range (they charge premium for basically the same window but 'PH grade' with 16 gap and double seals) and with Vrogum (with all-opening lights - I have no need of their fixed lights with 8 gap). Even with 12 gap 3G, at U1.1 they beat any aluminium window at U1.4 unless you spend more on exotic fill gas.That's the answer to 'why settle for ...' - for value for money with Russell, or for best-available traditional-style performance, with Vrogum. And
Posted By: fostertomAlternative to 12 gap 3G, 16 gap 2G is prob almost as good, so I'll be doing that in future, for minimised embodied carbon, with either Russell or Vrogum.
(note 16 gap, not sure about 20) confirms your last sentence. This is quite a climb-down from my 20yr (?) insistence on 3G, thanks to new insight in e.g. https://islandpress.org/books/build-beyond-zero#desc .]]> Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309594#Comment_309594 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309594#Comment_309594 Fri, 07 Nov 2025 07:54:57 +0000 Victorianeco
Nordan seem very cost effective and have seen their units in store

Will compile a basic chart to compare them all and update with prices]]> Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309616#Comment_309616 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309616#Comment_309616 Thu, 13 Nov 2025 11:46:51 +0000 EasyBuilder
The 28mm Triple Glazing (4-8-4-8-4) glazing you mention makes no sense unless you are constrained for window thickness and are opting for the most expensive Xenon gas, but the frames you mention can all accommodate 44mm (4-16-4-16-4) glazing using argon gas. There is a good explanation of glazing gaps and gasses on the Saint-Gobain website here: https://www.saint-gobain-glass.co.uk/wp-content/uploads/2022/05/Solar-Thermal-1E-Thermal-Insulation-19-09-2018.pdf]]> Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309617#Comment_309617 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309617#Comment_309617 Thu, 13 Nov 2025 13:23:51 +0000 fostertom Final Window Conundrum https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309623#Comment_309623 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18366&Focus=309623#Comment_309623 Fri, 14 Nov 2025 07:49:43 +0000 Victorianeco
Rationel - too expensive

So we have so far:

SMART 400
Senior Ali-Vu
Nordan
Allan Brothers
Vrogum (timber only)

Need to ensure all are 'like for like' pricing then I will look to specify

Thanks

The wife needs to finalise the colour]]>