Can I Install Metal Roof Directly On Top Of Old Composition Shingles?
More than removing the existing shingles is the manner of decking typically installed for a corrugated roof. Decking is 1x4s installed alternately up the rafters. Start at the bottom edge and nail down the first row, space a 1×4 width, nail the next row. We normally get the first row in place, stack up a group above it, and nail off the boards in every other row. (Nail all odd rows going up) After you have nailed off a few rows, you remove the alternate boards and move them up as you need more.
