Air tightness in real terms - New Build UK regs
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- Опубликовано: 11 сен 2024
- I went down the rabbit hole, yes another one. These things often get me side tracked and I want to know everything about it. Here I take you through the crazy and sometimes boring processing of my brain trying to work things out. Am I procrastinating? Probably!
What does air tightness in construction even mean? How many tradesman don't really care? What can you get away with? Is it really that important?
I discuss uk building regulations in comparison to passive house standards and what I'm doing to make sure I try and hit the requirements.
About me:
I'm Aiden and I'm documenting what was supposed to be my barn conversion, which has now ended up being a new build. I don't have a trade, I just have a go and I'll be doing lots of work myself. This is the boring bit in grand designs that you don't get to see. Subscribe and follow along to find out how our future home turns out.
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Is part 2 out yet. Love the maths - we’re very similar. Such a shame that socially unacceptable to be super controlling with trades - there’s a huge gap in the market there 😆
Part 2 will probably be in another year 😅
Alice started off just peeping down the hole and look where she ended up.
It's a cruel test, 2nd to drain tests IMO because the test occurs right at the end of the job. If it fails, then what? I did hear of a crowd that go around sites doing nothing other than applying sealant to all the cracks which gets them through. Also, if you know the right people, I wouldnt doubt that some houses fall way under spec. Of course the solo builder gets all the focus but then he generally takes more care. Looking at what youve done, I think youll breeze it. Neat job.
There seems to be a large disconnect between the academics and the builders. Few builders have picked up a pen, and few 'experts' have picked up a saw. Like you, I tend to chew on things to the nth degree until the answer pops out. In end you think, well that was a load of bollox in the scheme of things.
I have seen it suggested that if you're aiming for a low figure then it's best to have 2 tests. Then you can sort any leaks before you cover it up. But just to hit regs? No idea how builders normally ensure that 🤷♂️
Oh no the drains 🙈 that's gonna be an absolute ball ache
I just watched this video again. Watched it a few months back but doing my airtightness fixes now. I'm the same as you with this, how do you possibly know how air tight the building is without doing that actuall test. I'm really fretting over the test as I really don't want to pay twice to get the certificate I need for building control. Hopefully I'll be fine. 🤞
My guess is you're getting close to Passive levels of airtightness there. Hows about pressuring up the room with a fan cut into a door blank and trying to find the leaks? See if you can measure the area of all the leak holes!
I would totally do that but I don't have the time 😂 I'm not sure I even need to get this building tested but I will need to test the main house so will probably get this one done at the same time to see the results. Won't be until next year though
The paassive house 0.6 figure is actually ACH not m3/hr/m2.
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The q50 and n50 results are often very similar in typical houses, a coincidence due to their geometry, and which also partly explains why some people - in error - use the two values interchangeably. The results can be wildly different in more unusual building forms and in larger buildings because, as the building gets smaller (say a tiny apartment) or much larger (say a large supermarket), the ratio between internal volume and shell surface area changes a lot. This may also explain why it tends to be easier to achieve low n50 scores in larger buildings.
Ooooh so that's 0.6 air changes per hour! Haha doh!
You should have just got Dan to work it out for you 😉
Haha whilst we're both clever, his mind works differently to mine, so I'm the only one who would have taken the time to work it out and understand such a boring a** thing 😂
well i must get back to my painting Aden 🤔 😟🥱! is it raining outside?
😂 I'm glad it's not raining, I'm trying to finish the back of the cartlodge roof 😣
Rain man!
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Welp, im a moron :o
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