Instructions
Clean the Repair Area
The first step within the repair of any metal building material will involve cleaning the surface. A hole during a metal roof system is often caused by any number of sources the hole could also be from deterioration and rust, or it’s going to be from something falling onto the roof surface, like an outsized branch. regardless of the explanation for the opening, the world around the hole is presumably dirty and can require cleaning.
Thoroughly clean the surface of the metal panel using Simple Green or another cleaner, until the surface of the roof panels is totally freed from any dirt, film, and algae growth. Any cleaner residue will compromise the integrity of the roof repair.
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Scuff the Metal
After cleaning the surface of the metal panel, use a wire brush to scuff the surface where the repair is going to be made. Scuffing the surface will help the sealant bond to the metal. Use the wire brush only within the area to be patched; wire brushing beyond which will remove the protective coating from the metal panel surface, causing later deterioration.
Measure the Repair Area and Cut a Patch
Cut the chosen sheet to a size that matches the world to be patched. The sheet patch should overlap onto the metal panel a minimum of 2 inches past the sides of the damaged area. After the sheet patch has been cut and fit size, around the corners of the patch with a file or abrasive to stop any sharp corners from becoming a catching spot for snow or ice.
Once the patch has been measured, place it over the opening being repaired. Take a pencil and description the patch onto the roofing. Remove the patch and examine the outline to form sure the patch will overlap by a minimum of 2 inches altogether directions past the sides of the damaged area.
Install the Repair Patch
Apply a color-matched urethane sealant to the surface of the metal panel being repaired, staying just inside the marked pencil line. Apply the sealant liberally within the area, in order that there are not any gaps or voids at the vanguard of the patch.
Press the patch into place over the damaged area. The sealant should squeeze out from the sting of the patch along all sides. If there are areas where the sealant isn’t oozing, these are areas where moisture may later penetrate under the patch, causing a deterioration of the patch. Apply a touch more sealant here to eliminate any gaps.
Variation: Holes in Raised Roofing Seams
If the opening or damage to the roof is within the raised seam between panels instead of within the flat area of a panel, patch it with an asphalt-impregnated glass-membrane fabric over the damaged portion of the seam itself.
On raised-seam roofs, it’s important that the individual panels be allowed to maneuver along the seams, so never attach a metal patch that’s anchored to both roofing panels over the seam. Instead, repair the damage to the seam with narrow strips of membrane fabric confined to the raised seam section. The patching strip should overlap the damaged area by a minimum of 2 inches.
Over the highest of the patching strip, apply a coating of urethane sealant, then another patching strip. Done correctly, both roofing panels will still be ready to move independently.
Secure the Patch
Once the patch has been pressed in situ, attach it to the surface of the metal roof panel, using pan-head sheet screws. Space the screws every 3 to 4 inches around the perimeter of the patch. The screws should be applied within 1 inch of the sides of the patch, in order that they apply uniform pressure to the sides and to the sealant beneath the patch. The screws should be only long enough to secure the patch to the underlying roofing panel. Never screw the patch down through the roofing panels and into the roof decking or rafters.
As necessary after the patch has been attached, retool any sealant that’s bleeding from the sting of the patch, employing a spatula. this may make sure that the sealant properly seals the sides of the patch and prevents moisture from penetrating. Let the roofing sealant dry as directed by the merchandise instructions. it’s going to take each day or more to heal but up to at least one week to cure fully.
Paint the Patch to Match the Roof
If desired, the surface of the patch is often painted to match the color of the metal roof panels. to try to do this, lightly wire-brush the surface of the metal patch, and therefore the metal panel just past the sides of the patch. Paint over the surface of the patch and onto the surface of the underlying panel. it’s going to be necessary to attend for the sealant to completely cure before it’ll accept paint. Also, confirm that the paint is compatible with the sealant you used.
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