Sat, 04 Jul 2026 11:20:48 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206808#Comment_206808 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206808#Comment_206808 Sat, 09 Aug 2014 15:00:23 +0100 JT101
Can anyone point me to some very simple diagrams for good installation of windows

I guess I'm mainly looking at:

1) Timber frame (non passive house)
2) Brick & Cavity (non passive house)
3) Timber frame (passive house)
4) Brick & Cavity (passive house)

Many thanks]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206810#Comment_206810 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206810#Comment_206810 Sat, 09 Aug 2014 18:13:56 +0100 woodgnome Lots of installation details for various wall types.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206817#Comment_206817 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206817#Comment_206817 Sat, 09 Aug 2014 20:56:37 +0100 tony
Any window fixed in the outside skin is by definition not good in my book, writing most of the UK at a stroke!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206828#Comment_206828 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206828#Comment_206828 Sun, 10 Aug 2014 08:27:40 +0100 Triassic Posted By: tonyAny window fixed in the outside skin is by definition not good in my book Being at that point where we have planning permission and have just started to get into the detail, I find it difficult to find best practice. Ideally a best practice web site would be good, but lots of this stuff is only available behind a pay wall of some description.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206829#Comment_206829 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206829#Comment_206829 Sun, 10 Aug 2014 11:50:56 +0100 owlman
Don't you pay the architect to provide just that sort of detail?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206836#Comment_206836 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206836#Comment_206836 Sun, 10 Aug 2014 15:46:30 +0100 Triassic Posted By: owlmanDon't you pay the architect Yep as you said pay and I'm not sure that all architects are the font of best practice!

Nothing is free!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206838#Comment_206838 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206838#Comment_206838 Sun, 10 Aug 2014 15:57:34 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206843#Comment_206843 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206843#Comment_206843 Sun, 10 Aug 2014 18:47:46 +0100 djh Posted By: JT101Can anyone point me to some very simple diagrams for good installation of windows
There are a lot of details online for different window installations. But window installation seems to be one of the more difficult areas to find exactly what you need. The main problem is that it depends on what components you are using, what the surrounding components are as well as where you live and what your goals are. So there are a lot of possible variations. For example, when you say 'good' with regard to Passivhaus, I assume you mean - with least possible risk of any air leakage and with no thermal bridges and nominally zero psi value. But depending on the exact design of your house, you might be able to live with a slightly positive psi-value and save some cost. Or you might need a negative psi-value! And with regard to a non passive house, that's so ill-defined that there's no hope of finding a single meaning for 'good'.

For Passivhaus, the best practice guide is the Passivhaus Details book. There are also various specific details published by product suppliers.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206848#Comment_206848 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206848#Comment_206848 Sun, 10 Aug 2014 21:02:59 +0100 tony
I prefer check reveals and lintels, almost never see check reveals to windows except in good houses.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206853#Comment_206853 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206853#Comment_206853 Sun, 10 Aug 2014 22:08:09 +0100 JT101
Anyway, my point is that I'm either going to be dealing with Passive House, or normal buildings that have to meet the minimum code in the UK. So as you've rightly said, the passive house details book should cover all eventualities for passive house.

But I guess I need to understand the general underlying principles.

I usually see that the insulation always overlaps the frame on a passive house. So, despite the window units being passive house certified, the frames still are the cold bridge and need that extra insulation. So I get that.

But for normal build, the opening of the brickwork is smaller than that of the inner leaf of blockwork and the frames have checked reveals, butting up to the outside brickwork.
Or they are inline with the outer brickwork, so the opening is the same for brick & block.

But what is the advantage of checked reveals. In effect, the brickwork overlaps the frame, much like the insulation in passive house. But how does this help? Surely this could even leak heat away quicker since the brick could get cold, and transfer heat from the frame faster.

Thanks]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206861#Comment_206861 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206861#Comment_206861 Sun, 10 Aug 2014 23:14:06 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206864#Comment_206864 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206864#Comment_206864 Sun, 10 Aug 2014 23:23:37 +0100 Triassic Posted By: tonyPH details book Do you have the ISBN number for the book, or a link?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206865#Comment_206865 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206865#Comment_206865 Sun, 10 Aug 2014 23:50:37 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206870#Comment_206870 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206870#Comment_206870 Mon, 11 Aug 2014 09:36:50 +0100 Sigaldry
There's a dearth of good details with calculated psi values for normal timber frame I'm afraid.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206945#Comment_206945 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206945#Comment_206945 Mon, 11 Aug 2014 21:53:32 +0100 borpin https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206946#Comment_206946 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206946#Comment_206946 Mon, 11 Aug 2014 22:41:56 +0100 JT101 http://www.planningportal.gov.uk/uploads/br/masonry_internal_wall_insulation_illustrations.pdf

It is a detail for checked reveals. Is this what you are talking about Tony?

If so, how is this thermally better than the detail prior to it on page 32?

And secondly, how do you easily build such a thing. Trying to make an opening in the brickwork smaller than in the blockwork would a pain in the butt]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206947#Comment_206947 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=206947#Comment_206947 Mon, 11 Aug 2014 23:16:53 +0100 tony
Think how insane it is to put a piece of metal ove a window that extends from inside to outside!]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207007#Comment_207007 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207007#Comment_207007 Tue, 12 Aug 2014 19:42:52 +0100 borpin Posted By: JT101And secondly, how do you easily build such a thing. Trying to make an opening in the brickwork smaller than in the blockwork would a pain in the buttWhy? Standard detail in Scotland (worse weather). Only thing I'd add is that the windows should be set back inwards by 5mm or so to allow an edpm foam seal so the blockwork does not actually come in contact with the window frame (and put the window in a plybox to support it and fix it to the inner leaf of any material).

Are you building 2 skin block? Use a temporary ply box as a former or fit the windows as you go. Get the cill detail right though.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207069#Comment_207069 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207069#Comment_207069 Wed, 13 Aug 2014 12:35:07 +0100 JT101 http://www.thebreadcrumbtrail.org/gallery3/index.php/Misc-Travel/Eco-Living/Low-Energy-Buildings_001/Window-detail

From what I understand, there are only two countries in Europe that build cavity walls with brick and block in line. UK, and Holland. The rest use a checked reveal as you suggested.
And is it correct, that the main reason for doing this is A) that you can get a better weatherproof seal, such as the EPDM rubber, and B), so that you can easily insulate around the edge of the window as Tony suggested?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207078#Comment_207078 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207078#Comment_207078 Wed, 13 Aug 2014 13:04:05 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207079#Comment_207079 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207079#Comment_207079 Wed, 13 Aug 2014 13:17:29 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207098#Comment_207098 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207098#Comment_207098 Wed, 13 Aug 2014 19:15:59 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207105#Comment_207105 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207105#Comment_207105 Wed, 13 Aug 2014 22:12:50 +0100 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207106#Comment_207106 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207106#Comment_207106 Wed, 13 Aug 2014 22:25:43 +0100 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207109#Comment_207109 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=12420&Focus=207109#Comment_207109 Thu, 14 Aug 2014 08:31:30 +0100 tony