Because again other roofs are dumping water onto the patio cover overwhelming the system all at once.
Repairing aluminum roof on patio.
If this occurs still there is no guarantee of waterproofing.
Cut a piece of replacement aluminum with tin snips to 3 inches longer on all sides than the hole.
Make sure that you have safety gloves and footwear.
Fill a caulking gun with a watertight polyurethane or oil based sealant and hold it at an angle to insert the product directly into the gap.
How to solve these issues.
4 for physical damage if you can find matching roof material small holes can also be repaired with some visual detraction by using seam sealer and aluminum overlay piece and pop rivet or sheet metal screw a patch overt the hole or tear.
Locate the hole in the aluminum roof and brush the area around the hole with the wire brush to take away dirt debris and other things.
When patching holes on an aluminum roof you may have to climb onto the roof.
For a gap of 1 inch or less caulking or sealant is the best method of repair.