Mike_scotland Posted March 16, 2022 Share Posted March 16, 2022 So we have just had our air tightness test carried out and i believe it was about 4 which is not too much under the 5 we were giving to aim for at BW stage.... i know a pass is a pass but i was hoping for lower.... anyone else had a 4 to begin with and managed to get it down or am i just being awkward lol? Link to comment Share on other sites More sharing options...
Thorfun Posted March 16, 2022 Share Posted March 16, 2022 24 minutes ago, Mike_scotland said: So we have just had our air tightness test carried out and i believe it was about 4 which is not too much under the 5 we were giving to aim for at BW stage.... i know a pass is a pass but i was hoping for lower.... anyone else had a 4 to begin with and managed to get it down or am i just being awkward lol? are you having MVHR? if so, you probably don't want to go much lower than 4! Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 16, 2022 Author Share Posted March 16, 2022 6 minutes ago, Thorfun said: are you having MVHR? if so, you probably don't want to go much lower than 4! no MVHR mate, is 4 pretty good without MVHR then? i thought you had to get MVHR if you were below 3 Link to comment Share on other sites More sharing options...
nod Posted March 16, 2022 Share Posted March 16, 2022 We built traditionally and when asked I said 2 and guess what we scored 2 In reality we where supposed to get bellow 5 Either I’d done a great job with the airtightness Or the tests are a complete waste of money Link to comment Share on other sites More sharing options...
Ralph Posted March 16, 2022 Share Posted March 16, 2022 @Mike_scotlandI'm just about to organise my test, do you mind telling me who you used and how much it was? Link to comment Share on other sites More sharing options...
Mr Punter Posted March 16, 2022 Share Posted March 16, 2022 2 minutes ago, nod said: We built traditionally and when asked I said 2 and guess what we scored 2 In reality we where supposed to get bellow 5 Either I’d done a great job with the airtightness Or the tests are a complete waste of money As @Thorfun commented, a result of less than 4 and you should be asked to fit MVHR. Of course, BC won't bother even looking, as long as the as built SAP complies. Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 16, 2022 Author Share Posted March 16, 2022 13 minutes ago, nod said: We built traditionally and when asked I said 2 and guess what we scored 2 In reality we where supposed to get bellow 5 Either I’d done a great job with the airtightness Or the tests are a complete waste of money haha yeah seems a bit unregulated for me m8 Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 16, 2022 Author Share Posted March 16, 2022 8 minutes ago, Ralph said: @Mike_scotlandI'm just about to organise my test, do you mind telling me who you used and how much it was? Hi Ralph, I am unsure but i will ask my builder for you. 1 Link to comment Share on other sites More sharing options...
ProDave Posted March 16, 2022 Share Posted March 16, 2022 39 minutes ago, Mr Punter said: As @Thorfun commented, a result of less than 4 and you should be asked to fit MVHR. Of course, BC won't bother even looking, as long as the as built SAP complies. We had to provide the air test result as well as the as built SAP Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 16, 2022 Author Share Posted March 16, 2022 is 4 ok then or pretty poor? Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 16, 2022 Author Share Posted March 16, 2022 1 hour ago, Ralph said: @Mike_scotlandI'm just about to organise my test, do you mind telling me who you used and how much it was? Just noticed you are Angus too, where abouts are you building bud? you on instagram doing a build blog? Link to comment Share on other sites More sharing options...
nod Posted March 16, 2022 Share Posted March 16, 2022 2 hours ago, Mike_scotland said: haha yeah seems a bit unregulated for me m8 The problem is theres so many private companies at it If they where to fail major house builders The house builders would simply use someone else As I’ve stated previously Most seam to be done as a desktop test The commercial building that I work on always tested But after 40 years of fireproofing and soundproofing I still don’t understand how most score under three 1 Link to comment Share on other sites More sharing options...
Ralph Posted March 16, 2022 Share Posted March 16, 2022 2 hours ago, Mike_scotland said: Just noticed you are Angus too, where abouts are you building bud? you on instagram doing a build blog? No blog but my missus does instagram @blackfoxbarn we're outside Edzell. Link to comment Share on other sites More sharing options...
Thorfun Posted March 16, 2022 Share Posted March 16, 2022 2 hours ago, Mike_scotland said: is 4 ok then or pretty poor? it all depends on what you want! 4 is ok if you're not having MVHR and it is substantially better than building regs at 10! 1 Link to comment Share on other sites More sharing options...
JohnMo Posted March 16, 2022 Share Posted March 16, 2022 You be worth having a read of the regs, to make sure you have the required ventilation strategy in place https://www.gov.scot/publications/building-standards-2017-domestic/3-environment/314-ventilation/ 1 Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 17, 2022 Author Share Posted March 17, 2022 17 hours ago, Ralph said: No blog but my missus does instagram @blackfoxbarn we're outside Edzell. we might have you guys already we are ourangushome Link to comment Share on other sites More sharing options...
ProDave Posted March 17, 2022 Share Posted March 17, 2022 20 hours ago, Mike_scotland said: is 4 ok then or pretty poor? That depends what you are hoping for. I was disappointed with 1.4, I was hoping for less than 1, but in practical terms our house is very low energy. Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 17, 2022 Author Share Posted March 17, 2022 2 minutes ago, ProDave said: That depends what you are hoping for. I was disappointed with 1.4, I was hoping for less than 1, but in practical terms our house is very low energy. i think likely a 3 or less but hey ho i think 4 isnt too bad! Link to comment Share on other sites More sharing options...
Iceverge Posted March 17, 2022 Share Posted March 17, 2022 Do you have the report, was it 4 ACH, 4m3/m3 floor area or envelope area? Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 21, 2022 Author Share Posted March 21, 2022 On 17/03/2022 at 13:55, Iceverge said: Do you have the report, was it 4 ACH, 4m3/m3 floor area or envelope area? It was 4.46 Envelope area of building is m2 468 it says. to be fair though there is still services coming through the floor and you can feel a draft so thats being sealed up today! so it could of maybe been better if it was all completed however we are rushing for the RHI so needed the AT test. Link to comment Share on other sites More sharing options...
Iceverge Posted March 21, 2022 Share Posted March 21, 2022 Ah, I would encourage rigging a diy blower door to try source as many of the holes as you can. It'll be a real pain once you're moved in to do anything about it. Its about your house being as comfortable as possible at the end of the day, not a test result. Even patching up a hole the size of a credit card reduced our test by 0.1 ACH. 2 Link to comment Share on other sites More sharing options...
Russell griffiths Posted March 21, 2022 Share Posted March 21, 2022 On 16/03/2022 at 16:42, Mike_scotland said: is 4 ok then or pretty poor? On this forum it’s poor, on a housing estate full of Barrett homes it’s pretty good. Link to comment Share on other sites More sharing options...
Iceverge Posted March 21, 2022 Share Posted March 21, 2022 Whats your building volume? Floor area X ceiling height will do. ACH is more universally used outside SAP world!! Link to comment Share on other sites More sharing options...
Mike_scotland Posted March 21, 2022 Author Share Posted March 21, 2022 1 hour ago, Iceverge said: Whats your building volume? Floor area X ceiling height will do. ACH is more universally used outside SAP world!! how do i find that? Link to comment Share on other sites More sharing options...
Iceverge Posted March 21, 2022 Share Posted March 21, 2022 Fairly simple. Take your total floor area and multiply it by the ceilings height. Vaulted spaces can make it a small bit more complex. Link to comment Share on other sites More sharing options...
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