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I think if you find the right builder and show them the exact detail you want then you’ll be ok. The problem as I’ve seen it, is that on bigger jobs putting the insulation into a building often falls to the labourers without much instruction or supervision. So what you get is some wonky PIR cut with a handsaw. Again if you get the right person and show them what you’re trying to achieve a lot of builders would be interested to learn a different process.
If you do it yourself (and I think most people could do it) then you can guarantee it will be done right and save some money. But if you’re short on time the idea of ripping your floor up can be pretty overwhelming I guess.
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Thanks guys. At work I see insulation being installed soooo badly all the time. Honestly horrifying how much people are paying for building work and the insulation being put in is truly awful. So I was pretty motivated to do it right on my own place. I’d actually love to get more into sustainable building / retrofit for work.
From scratch I reckon, so floorboard removal, prep and installation included. It was basically 3 rooms and a hallway.
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Yep, I did it myself but I’m a carpenter. It was quite a lot of work In the end. I had to level all the joist again and tie them together as they were just rested on the sleeper walls. I replaced a couple that had some rot and treated everything with wood preserver. The membrane installation is physically hard as you have to constantly stoop down and reach to staple it whilst also trying to keep it taught. The taping is also fiddly and takes time to get right. Putting the insulation in is the easy bit. We made it harder for ourselves by trying to limit the floor build up. So we also had to batten each side of the joist and cut OSB to fit between to form the sub floor. None of it is particularly complicated but it is hard work. It probably took me and my partner a week to do the ground floor of small 1950’s house. I’m really happy to know it was done right though and the floor isn’t going to rot away beneath me.
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I’ve just used this detail for insulating suspended timber floors downstairs. I was keen to get it right as we’re having UFH, so really wanted to ensure that the insulation wouldn’t cause problems with damp down the road. Any repairs would become a massive undertaking. This seemed to tick all the boxes, using the hemp insulation was a dream
Compared to PIR. https://www.ecologicalbuildingsystems.com/post/best-practice-approach-insulating-suspended-timber-floors -
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https://www.sladvalleymushrooms.co.uk/
Have received and bought a few kits from these guys as gift before, with good results.