Floorboard rennovation questions

[Dylan123]

400mm will squash in.

better a bit too big than a bit too small.

You can if necessary cut it with a breadknife or fine saw (easiest while still on the roll) or trim with big scissors, like wallpapering scissors.

thanks so much for all your help - you’ve been a godsend - and everyone else, office boys like me need real men to tell me how it’s done!

 

[Dylan123]

Just ordering and both Knauff and most of it is glasswool, presume that’s good enough and I don’t need rock wool.

also there is some cheaper stuff which is perfect size for my joists by a company called Isover. I read it’s not as nice to work with (I can deal with that, It will be one day) and it’s cheaper. The ratings are the same as Knauff.

I guess this stuff is all pretty much the same and as the ratings are good enough there’s nothing I am missing here and it’s not essential to buy Knauff or rock wool?
Cheers