hi,
looking to put new plasterboard on first floor ceiling but my ceiling joist ar sagging quite a lot in the middle, the struts are pushing them to sag. i have 3 struts each side, as in pictures.
Could you give me advice if it's ok if i put 2 acrow props for each side to hold purlin then cut two struts which is parallel to each other, then sister joist ( only the ones is holding strut) with same 3x2 c24 timber, level them up. Add shims where brick wall goes in the middle under joist. And then make same strut with new timber on now doubled 3x2. and then move to another two struts.