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Simple question. Want to shove in two layers of 75mm rockwool that I have on hand in a loft room where I have access to the rafters. That would leave me with a 30mm gap behind. I'm assuming it is fine because the roof is unfelted so no problems with ventilation, right?

Well, presumably going to just carry on with the original plan as nobody has said anything to the contrary. As it's all breathable stuff I don't think it'll cause issues, and throwing the design up on Ubakus doesn't show any condensation issues arising either under normal conditions.

That's a pretty pricey one I'll give you that

What laser level is that?

Which is going to be fun—all three studs on this small bit of wall are twisted, in different directions, too! 1800s builders were something else.

If I do that the same thing would happen, as the entire stud itself is twisted. I'd need to tack down the batten while packing it out against the side of the stuf to be flat. Is that what you meant?

Hi, Got some studs that were installed in an old house and twisted when they were nailed in, as they're not straight onto the pencil line drawn on the floor. Can't take the studs out and reposition them as the opposite end is on a finished wall, so a bunch of laths are nailed to it, meaning...

It's a loft room, so there is heating within the room as it is used as a bedroom.

An all PIR setup isn't the best if sound absorption is wanted. It's terrible for that, so having a thick mineral wool layer behind the PIR would work great for that.

Long story short, tore down old walls in loft room, and will insulate between studs with rockwool. Would like to avoid cold bridging through studs but don't want to lose room space and mess about with the door jamb if possible. As I have acess behind the studs I could either throw up 100mm glass...

I was thinking about standard levels of humidity. 50-60%, nothing excessive really. It was just with an obviously extremely cold outer wall, that wasn't enough to prevent damage from condensation, even if it was only small amounts over time and nothing visible on the wall itself. I take it then...

To be honest, in my experiments with tape that stuff virtually bonds itself to whatever you stick it to, and when peeled off leaves a big gooey acrylic residue. I can't see that failing any more than the same sealing tape we use for the edges of sheets, etc. The main issue would be user...

Hi, Have an exterior wall (cavity behind it is ventilated with outside air as in roof space), west facing. The old wall is just your standard lime plaster on wood laths that are basically strapped straight to the stone. Want to tear it all down and insulate, as I have had issues with small...

Hello. This is an old post, but I'm bumping it to ask a relevant question: isn't taping both layers of PIR creating a double vapour barrier? Isn't this generally frowned upon because if moisture can cross the first layer, it could be trapped between both VCLs with no way of escaping?

Funny you say that, as I have good and bad news. Bad news is, I took a saw to the wood and cut into it. Yep, it is a live infestation, as I could see the little *******s. They looked a bit like giant corn lice, and some googling tells me that they're very likely to be Wood Boring Weevils...

This piece of wood is just a standard off the shelf untreated softwood as far as I know.

I always thought that dust was supposed to be lightly coloured like sawdust, and not a very rust coloured brown.

Hi all. Took some pieces of 2x2 wood lying around I had in order to cut out noggins when removing an old fireplace hearth that then had a bit of cut chipboard flooring placed down and some framing on top. I then discovered the end of that wood (I don't know how I missed this) appeared pretty...

Okay, so I drove through a bunch of fully threaded screws on either side of where I'd driven in the decking screws; with the decking screws keeping it clamped down so it didn't separate from the joists when screwing the fully threaded ones through. Made sure the heads were flush or just slightly...

Perfect, good to know… because as I'm building the 2x2 framing some screw heads also just drove in fairly deep, I presume because the wood is still fairly wet and probably pretty malleable. I just wondered, as nobody seems to be asking that question either on Google. It was all just about not...