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Hi I only have the certificate from the council for the formation of the through lounge, it doesn't give any technical specs but looking up at the rsj it measures 3200mm long by 350mm deep by 150mm wide. The shortfall across the width of the house is made up by the brick pillar and what looks...

Hi the lathe and plaster wall is sitting on top of a very big rsj which is in the through lounge ceiling below one end sits in the wall and the other sits on a brick pillar which goes into the foundations. I still see your point though because I don't imagine the lathe and plaster has much...

Hi the joists go 4000mm from central wall to front wall and 4000mm from central wall to back wall. In the picture were you see the edge of loft access is the central wall.

Hi yes I mean overlap and the joists are sitting on a wood beam which is part of a lathe plaster wall.

Hi thanks for the reply do you think I could cut new joists and glue and screw them from middle wall to binder along old joists, as single length would not be perpendicular across middle wall joists as the old ones are offset also do you think that would add more weight plus strength aswell?

I wonder if anyone could help me, I have recently installed a complete loft access kit to get into the loft to board it out for storage. After doing a diy survey I have realised that my ceiling joists are 50mm wide by 90mm high and 4000mm long, each joist is 300mm apart. Each joist sits on top...