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This junction, see photo, is currently leaking inside... a lot.

I guess the question is how to connect a horizontal metal carport roof to a shingle roof.

I am thinking some sort of flashing will be required here.

Does anyone know the correct way, if there is one, to connect these two roofs?

enter image description here

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  • The leak is through the (2) different roof joint? And are the roofs at the same level?
    – ojait
    Commented Jan 17, 2021 at 16:34
  • Yes, the leak is at the connection. The roofs are the same level.
    – Seth B
    Commented Jan 17, 2021 at 16:53

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The trouble is the metal roof's profile. It would be easier if it were smooth (flat).

My instinct tell's me that it would be best to tuck a strip of 30 weight felt or rolled roofing under each roof rake (edge). Starting at the bottom by sliding 4 inches of the underlayment (felt) under the asphalt shingles and the metal roof. This will close the gap at the seam of the (2) roofs. Overlap each row by 2-4 inches.

Next you can either extend the metal roof onto the asphalt roof (if you have some). Overlap each roof with 24 inch length's and secure it as normal to the metal roof.

Or you can simply glob some roof patch down the length of the roof seam and press in a fiberglass mat followed by either metal flashing that is 4 inches past the seam on either roof (and nailed/screwed to each roof) or a strip of mineral roofing (rolled roofing).

The rolled roofing can be adhered to both roofs with rolled roofing cement which essentially glues it to the roofs surface. It should be nailed also.

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