A builder is proposing to build me a new loft floor using 4"x2" timbers spaning 7'. One end is hanging off an 8"x4" timber and the other is supported on the central wall. This wall is lath and plaster and I beileve it to be hollow with timber uprights. Is this correct or would it have a brick core? So should I be worried? The loft room has been there for over 40 years before I moved in, supported in the same manner without any structural problems but as the ceiling joists are only 2.5"x2" I thought it might be an idea to strengthen them and add a new floor. The other option of course is to go down the building regs route and span the central wall but I lose another 6" head height causing the need for a dormer, which I really don't want to have.
Should I scrap the whole idea? The neighbours use their loft on the ceiling joists and don't seem worried at all!