Go to Forum Home › Building Refurbishment and Retrofit › airtightness in refurbishment
- This topic has 4 replies, 4 voices, and was last updated 17 years ago by Nick Grant.
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- 13 April 2007 at 2:56 pm #30683
Has anyone managed to achieve high airtightness levels in a refurbishment of a house in the UK? or do you know anyone who has?
Some projects in Germany have been certified to achieve 0.2 air changes per hour in refurbishment.
Is there a secret we don't know about or is it just good design, detailing and workmanship? - 16 April 2007 at 8:52 pm #33895
The UK hasn't managed 0.2 on new build. The best I know of ever is about 1.1 (a house built near Reading in 1995 from concrete/BECO). Paul J might know of better figures as he tests lots of buildings.
I'm suspicious about 0.2 m3/m2hr @ 50 Pa on a retrofit. The tightest new build ever, anywhere on the planet (Canada), was 0.15.
I hope you are using units of m3/m2hr at 50 Pa. 0.2 ac/h @ 50 Pa can be fairly easily achieved on a large enough building, so long as it has an enormous volume and a relatively small surface area.
David.
- 17 April 2007 at 11:29 am #33896
Thanks David
That makes sense now the German measurements seems to be always in airchanges per hour. - 17 April 2007 at 11:42 am #33897
David,
“So long as it has an enormous volume and a relatively small surface area”You mean like the Tardis?
š
- 18 April 2007 at 7:14 am #33898
Also beware units of litres/second/m2 @ 50Pa which I just spotted in the latest PH proceedings!
0.2 l/s/m2 = 0.7 m/h
It's worth repeating that the structure should not penetrate the airbarrier – rafters, purlins, floors etc.
nick
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