I've read about air testing on here, marvelled (enviously ) at some people's results and thought I understood the concept.
The phrase "taping windows and doors" keeps coming up. What does this mean exactly? If you need to tape to test then in real world use that tape isn't there and the results are pointless. The window / door design should surely be such that the rubber seals are in effect airtight without taping. I can half understand taping over key holes as those mechanisms might be inherently leaky but then not really. They should be the known (minor) loss points and everything else should be designed out.
Spot on. This was EXACTLY the case with the well-known timber frame firm building the development of five houses that we went to see. They were struggling to get the first completed house to pass, and it was about to have it's third air test, so it is near certainty that the other 4 houses on the development came no where near to meeting Part L1A. They were putting a lot of work into taping up around windows and doors when we were there in order to get a pass, which suggests that they don't normally bother to use airtightness tape on most builds. Given that, even with a house just built to meet building regs most of the heat is likely to be lost via air leakage and drafts, then i think it's fair to say that few new builds come close to their certified energy performance.
I don’t really understand the air tests They seem like a pointless excercise
I’ve carefully sealed all sockets Air can get in but not out But yet prior to testing the builders use baby plugs on the sockets tape one downlights tenpory tape and foam around windows and doors
All to say the house has reached a reasonable standard of air tightness
Googleing airtests shows how low pricing has become
Ive just had three home energy Certs done for three rentals we have
£25 each All very detailed certs
Though pretty simalar
I remember people were giving up there jobs to retrain to do the these compulsory home energy certs
With charges expected to be about £500 per property
Now it’s like everything else cut throat
stack them high sell them cheap