Project workflow
Separate surface quantity from system design
Measure the actual surface or wall run
Keep wall area, ceiling area and framing length as measured geometry. Split different assemblies instead of averaging them together.
Use project-specific product assumptions
Board size, compound coverage, fastener rate, insulation package coverage and stud spacing should come from the selected system or approved project documents.
Round only the thing you buy
Round sheets, pails, screw boxes, tile cartons, insulation packages or studs after the measured quantity and allowance are clear.