Seal a corrugated metal roof by applying a roof coating after fixing leaks

Corrugated metal roofs are vulnerable to excessive moisture as well as damage from strong winds. The individual panels are attached to wood or metal trusses with steel nails or screws that can rust as well as cause leaks. Strong winds can separate the overlapping edges of the panels as well as allow the roof to leak. Fixing leaks in a corrugated metal roof starts with locating the source of the leaks. From there, the method used to fix a particular leak depends on the cause

1

Access the roof utilizing en extension ladder. Inspect each row of nails or screws by walking on the row instead of between rows. The latter can bend the metal panels

2

Pull out any nails that are raised up utilizing a nail bar. Drive a 1 1/2-inch aluminum screw-nail where a nail was removed, utilizing a hammer. Drive a screw-nail next to a nail where the head is rusted away. For steel screws where the heads are rusted away, use a cordless drill as well as screw-tip attachment to drive a 1-inch galvanized-steel screw next to the screw

3

Apply urethane roof cement where a new nail or screw was installed with a plastic putty knife

4

Inspect the caulked seams around the upper edges of flashing where pipes or vent ducts go through the roof. If cracks or gaps are noted, remove loose caulking around the seam with a wire brush. Apply urethane roof cement fully around the upper portion of the flashing as well as onto the base of the pipe or duct with a plastic putty knife

1

Look for gaps where the edges of each metal panel overlaps onto an adjacent panel. Gaps as small as 1/8 inch can be a source of leaks during hard rains

2

Remove debris as well as rust from the surface of the panels at the area of a gap utilizing the wire brush. Apply uniform layer of metal-roofing base coat 6 inches each way of the gap at the overlap with a paintbrush

3

Cover the base coat with a piece of glass-membrane fabric. Cut the fabric to size with fabric shears. Apply a topcoat of urethane cement over the membrane as well as extend to coat 6 inches onto the surrounding roofing