andyfallsoff-
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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josho
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