Author Topic: Air testing on a new build school  (Read 6267 times)

Hazel Vansittart

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Air testing on a new build school
« on: December 04, 2008, 07:29:21 PM »
The contractor has organised the initial air testing on a new build primary school for next week. The building is 2-storey timber frame (I-joist walls & roof cassettes filled with warmcel). Will be interesting to see the results, as we've emphasised the importance of good airtight envelope during the construction (and seen miles of sticky tape installed:) we're aiming for 2 m3/hr/m2.

Will give an update on Tuesday.
George

Andy Simmonds

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Re: Air testing on a new build school
« Reply #1 on: December 05, 2008, 09:02:51 PM »
George,
Very interested to see the report. Could you upload the air test report in its entirety?



Hazel Vansittart

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Re: Air testing on a new build school
« Reply #2 on: December 10, 2008, 10:49:54 AM »
Two classroom "clusters" were tested. Unfortunately, the main contractor did not prepare these areas for testing, ie did not seal around ducts, penetrations, sockets etc. This made the testing rather pointless. Nevertheless, the second tested cluster was sealed after a bit of a discussion. The results were: 6.5 for the "untouched" cluster and 4.3 for the "sealed" cluster. The 4.3 figure equated to approx 0.14m2 of free area over two 65m2 classrooms. The smoke test was carried out around windows - these generally performed well, apart from large sliding doors. No formal report was issued, as the results were not entirely "validated".

The engineer from Stroma advised that it would have been more useful for them to carry out an audit before any testing, to highlight any potential leakage areas and advise on sealing using appropriate products. We will do this prior to final testing in spring.

Nick - you've won the bet.

George
« Last Edit: January 18, 2009, 02:04:01 PM by Hazel Vansittart »

Nick Grant

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Re: Air testing on a new build school
« Reply #3 on: December 10, 2008, 09:36:12 PM »
All credit to you George for committing to reporting the result before you had it.

Good to learn where it leaked.

Nick

niall crosson

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Re: Air testing on a new build school
« Reply #4 on: January 08, 2009, 12:32:22 PM »
Hi All,

Hi everyone. I'm a newbie to the forum. Well done George for highlighting this. The images are fantastic. I would agree with the engineer from Stroma that an a pre-test audit would be most useful. I have quite a lot of experience in the area of airtightness and projects which regularly achieve best practice results or even Passiv Haus standards for airtightness, on a repetitive basis. These projects generally ensure a pre-test audit is conducted, prior to the internal lining been applied.

At this stage a full blower door test may be carried out, however, a builder may simply need to highlight primary leakage areas and seal them effectively. A handy tool which may be used by the contractor on site is the pro clima WINCON. For more information on this please see this link:
http://www.ecologicalbuildingsystems.com/UK/products/wincon/WINCON%20A4%20LEAFLET%20flat.pdf

It's can be seen as the spirit level for the builder for airtightness. This is by no means a silver bullet for air tightness...but its very close! It should be stressed that it does not replace the blower door test, as it does not provide an exact measurement. A final test is still necessary to confirm the measured air tightness of the building. It is based on the same principle as a blower door test and allows contractors to monitor workmanship on site as a project nears completion, and highlights primary leakage areas. Buildings can be assessed on a room by room or whole building basis.

Hope you find this usefel,

Cheers ;),

Niall

Hazel Vansittart

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Re: Air testing on a new build school
« Reply #5 on: May 09, 2009, 08:43:40 AM »
OK, the final testing is booked for next week. The sweepstake begins now.

George

Hazel Vansittart

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Re: Air testing on a new build school
« Reply #6 on: May 27, 2009, 09:34:08 AM »
Got the results back from STROMA:

Nett floor area: 2,162m2
Envelope area: 6,196m2
Air Permeability Rate @ 50 Pa: 4.07m3/(hr.m2)
Effective leakage area: 1.99m2@50 Pa

Still trying to get STROMA to confirm what the result is equivalent to in air changes per hour as apposed to m3/(m2.hr), our initial calculation gave us 2.13 ac/hr. Quite a considerable difference.

George

PS: does anyone know how to attach files to posts?

 

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