Sun, 17 May 2026 15:42:06 +0100 https://www.greenbuildingforum.co.uk/newforum/ Lussumo Vanilla 1.0.3 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309799#Comment_309799 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309799#Comment_309799 Fri, 05 Dec 2025 17:11:27 +0000 tony
The big news is that my dream is about to come true

I would be keen to from any others who have heat flux data for walls of any type please]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309801#Comment_309801 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309801#Comment_309801 Fri, 05 Dec 2025 18:22:35 +0000 djh https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309802#Comment_309802 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309802#Comment_309802 Fri, 05 Dec 2025 18:46:40 +0000 Nick Parsons https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309901#Comment_309901 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309901#Comment_309901 Mon, 15 Dec 2025 18:10:37 +0000 tony
I have a few building types lined up and am about to start a list]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309902#Comment_309902 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309902#Comment_309902 Mon, 15 Dec 2025 18:56:20 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309903#Comment_309903 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=309903#Comment_309903 Mon, 15 Dec 2025 18:58:33 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310113#Comment_310113 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310113#Comment_310113 Tue, 27 Jan 2026 10:01:03 +0000 tony
Dot and dabbed on medium density blocks, cavity with “fluff” rendered blockwork outside skin.

U -value as found 0.54, after retro filling in void between blocks and plasterboard with fire retarded EPS beads = 0.37

I think this delivers a 30% saving on heating demand and has the added benefit of fewer draughts.

Property was built in 1986 - uncertain about the as designed u-value but suspect 0.6]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310117#Comment_310117 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310117#Comment_310117 Fri, 30 Jan 2026 10:22:57 +0000 Doubting_Thomas https://www.buildtestsolutions.com/u-value-measurement/heat3d-infrared-thermography

which uses the FLIR One and iPhone to monitor heat flux and establish a u-value.

The kit was fiddly to set up (easily disturbed), but delivered results after a few days of monitoring. Generally measured u-values of older solid walls were better than 'on paper' and newer walls were a bit worse.

We also found that the u-value varied in different spots of the wall, so you need to do a few 'takes' to get a reliable figure.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310310#Comment_310310 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310310#Comment_310310 Thu, 26 Feb 2026 14:09:01 +0000 tony
16 year old timber framed house - 30% underperforming

Brand new 0.1 timber frame with designed U value 0.1 measured at 0.09 likely result of careful workmanship

1950’s cavity wall was 1.6, when filled with ‘fluff” 0.68 and after internally thermally lining it with 50mm eps/plasterboard laminate 0.34.

The odd result was a 1960’s mansard wall with no insulation at 0.09????? Under further investigation

More monitoring is ongoing.

We are using a heat flux detector, indoor and outdoor temperature sensors and internal and external wall surface temperature , data logging for seven to ten days]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310311#Comment_310311 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310311#Comment_310311 Thu, 26 Feb 2026 14:21:10 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310315#Comment_310315 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310315#Comment_310315 Fri, 27 Feb 2026 10:59:17 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310317#Comment_310317 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310317#Comment_310317 Fri, 27 Feb 2026 13:29:06 +0000 fostertom https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310320#Comment_310320 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310320#Comment_310320 Sat, 28 Feb 2026 08:18:36 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310321#Comment_310321 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310321#Comment_310321 Sat, 28 Feb 2026 10:45:22 +0000 djh https://www.buildtestsolutions.com/u-value-measurement/iso-9869-measurement-system ?]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310329#Comment_310329 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310329#Comment_310329 Sun, 01 Mar 2026 20:47:12 +0000 tony https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310358#Comment_310358 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310358#Comment_310358 Sat, 07 Mar 2026 21:44:25 +0000 tony
The flank wall value most likely benefited from three factors that help improve the U-value, a) careful installation of the fibreglass batts with no gaps, b) using basalt fibre wall ties to reduce thermal the bridging of the more common metal wall ties assumed in the U-value calcs, and c) highly air-tight construction. But a 20% improvement on design was very satisfying to find.]]> https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310359#Comment_310359 https://www.greenbuildingforum.co.uk/newforum/comments.php?DiscussionID=18380&Focus=310359#Comment_310359 Sun, 08 Mar 2026 00:18:51 +0000 djh

It's all stuff I'd be interested to do on my own house if it wasn't so expensive. I can't really even justify doing a repeat airtightness test just for interest, and that (I hope) is a lot less expensive.

It's a pity there aren't (a lot) more of community ventures that share the cost of the equipment and the desire.]]>