Sealing the Joints of a Metal Roof
On a red metal roof, the joint against the parapet was full of dirt and crumbling foam. It was cleaned out, refilled and sealed, and the screw heads were covered too.
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Step by step
1. The roof before
The sheets had faded and the flashing where the roof meets the wall was worn.
2. The wall above the flashing
Where the roof meets the wall, the render had opened up. Water finds its way under the roof through spots like this.
3. Crumbling foam
The old foam that filled the joint had broken down in the sun and left openings.
4. The gap at the parapet
There was an open gap between the sheet and the parapet, and the parapet had turned black with damp.
5. Cleaning
The channel next to the parapet is cleared of dirt and debris so the new materials bond properly.
6. New foam
The joint is filled with new foam, closing it along its whole length.
7. Sealing and screws
A waterproof coating goes over the foam to protect it from the sun. Every screw is covered too, because water often gets in through the screw holes.
8. The result
The joint at the parapet is closed and the screws are sealed across the whole roof.