Hi, I've just come to boarding internal walls on a bathroom and can see that the roof truss (ceiling plasterboard will be fixed to the truss) is some 20mm higher on one side of the room than the other (across about 2.8m.)
The walls that meet the ceiling will be tiled so the difference will stick out like dogs balls, A couple of questions:
1. Whats the best way to fix the difference? Shimming or sistering the underside of the trusses or something else? (builder long gone so up to me to sort it out)
2. Is such a difference an acceptable amount? (whats a general tolerance over about 3m - I'd have thought the trusses should be dead level?)
Thanks in advance.