Hi all, I've read most the loft posts here that seem relevant to me. I have a house built in 1919 and want to use the attic for storage. The first job is to increase the hatch size to install loft ladders as it's currently in between joists. I think I've worked out what to do for increasing the hatch size (see below) but I'm not sure on the second part of the job - boarding over the 270mm insulation. _____________________________________________________ Joist size The joists are 6" x 1.1" = 150mm x 30mm. Most the forum posts are referring to 4x2s or 3x2s. I've not seen anyone talk about joists at a size similar to mine! When it comes to cross battening joists at a 90 degree angle, with 4x2s or 6x2s, would that be too big for these skinny ones to support? _____________________________________________________ Hatch hole increase (pics not to scale!) First image: Original hatch is between E and F I'd screw some timber (G1 and G2) before cutting the red lines. Second image: What I'd expect after cutting. Third image: It looks like the general consensus is to double up for where you've cut, in that case the frame would be made up from - G1, F1, G2, F2, H1 and H2 (these would have to be 6 inches in height to be flush with the current joists? So probably using 6x2s? Thanks.