sb1202

By the back do you mean facing the exterior wall?

This got me thinking - If wool insulation is used instead of PIR, then how do you keep the wool from bulging and falling out the back of the stud frame into the gap? String? Some king of wire tie? Is there something for this?

Yeah - very common. I've seen this in lots of other houses I've worked on. I found the old plans and it was spec'd by the architect for 50x45mm studs and 60mm "pillow" insulation. I've since learned that the previous owner who did the renovation was as tight as the proverbial duck's bahookie.

I've seen videos using a foil edging tape. Apparently this works better than foam. Yeah, the problem is the high and low spots in the wall. I took measurements and the gap from stud to wall varies from 60mm-160mm on this one room. I'm presuming there will be similar deviations in the other rooms.

What are these for? This is really common in these type of renovations. The studs are tied to the walls with pegs so its pretty rigid. The cottage throughout has heavy wall cabinets, bathroom is fully tiled etc and the studs are bang on plumb after 40 years. Agree that some more depth will help for thicker insulation. There's enough wiggle room to sister the studs towards the wall and keep the floor space intact - will be a pain in the proverbial though Thanks for the reply - it helps a lot.

Yeah, they just seem to have shoved it in. There's plenty air flowing through the roof void though - quite a big roof space actually.

This is the part that's confusing me - why is a membrane required for the cold side? What do you mean by a service gap? yeah, outside it well pointed. I can take out the studs easily enough and start afresh.

Thanks for adding me. Looking for advice on how to best insulate the internal walls of a stone built cottage. It's single storey with some modernisation from the 1980s. Walls are 600mm (not 400mm). Internal walls are drywall with vapour barrier on 50mm batten frame and at 150mm gap from the walls. Roof is insulated with about 300mm knauf type wool. Floor is concrete/dpm and chipboard on 50mm and not insulated. I upgraded the anel rads to columns a couple of years ago and this made a difference but it's still difficult to retain heat. There's no damp and I've taken the drywall out in one room, and again, everything bone dry. The humidity sits around 50% in winter. I'm installing UFH in the next month and looking to finish it off with internal insulation. I've read as much as I can but I need advice as I've read so many different ways. This will be DIY (I'm an electrical engineer and pretty competent when it comes to carpentry and most general building works) Photos attached give an idea of the rooms. This is aberdeenshire. Thanks for any help.