Ladder frame was installed out-of-square between rafters due to ALL measurements based on his first cut of ceiling drywall. Ladder frame headers/footers were installed based on the drywall cut, not the use of a square against the support rafters. Took three attempts to get the work done: first the opening was too small (poor measurements); second the ladder door would not close properly because the ladder frame was forced to fit headers that were installed out-of-square; third the 22-inch ladder frame width was into the 24-inch opening as a parallelogram. Efforts to point out the problem were ignored. (I subsequently undid his work and reinstalled the ladder frame on the square. Materials purchased for the job were sub-standard. As he 'undid' each error, he used a reciprocating saw to remove nails and in the process cut into the ladder frame (1x4 pine), which may have weakened it. Nice guy with a LOT of impressive tools, but not much of a planner.