The paper is from the manuf. Process 1) take 220 grit dry wall (DW) sand paper looks like window screen poles can be attached to sander for high spots. Prime with a primer like (zinzer) brand name let dry, high humidity it will take longer to dry, dry to touch.2)rescind lightly with 220.3) light weight … Read more

Divide by 360 degrees and divide by eight and that is the angle in degrees. Use that angle as the centerline for rafters and joists