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Old 03-14-2010, 06:01 PM   #1
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Transition seam


What is recommended along the seam between two different roof pitches? Such as where a porch roof of a low pitch meets with a higher house pitch. I believe there should be something at the transition seam under the shingles (Regular Asphalt). Metal Flashing? Some other sub surface?
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Old 03-15-2010, 10:15 AM   #2
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Transition seam


I recommend an ice barrier, situated to drain ON TOP of the lower section, and a metal flashing, also situated to drain ON TOP of the lower section.

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Old 03-19-2010, 11:56 AM   #3
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Transition seam


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Originally Posted by Mark Harvey View Post
What is recommended along the seam between two different roof pitches? Such as where a porch roof of a low pitch meets with a higher house pitch. I believe there should be something at the transition seam under the shingles (Regular Asphalt). Metal Flashing? Some other sub surface?
Thanks.
Are both the roof planes asphalt shingles?
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Old 03-19-2010, 04:38 PM   #4
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Transition seam


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Are both the roof planes asphalt shingles?
Better response than mine...
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Old 03-20-2010, 10:56 AM   #5
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Transition seam


Yes to both roofs being asphalt shingles.
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Old 03-20-2010, 11:45 AM   #6
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Transition seam


I would install I&WS so it laps over a course of shingles in the lower pitch plane a course or two below the transition and just shingle through the transition. If you add metal, you've created an unsealed seam where water can back up under the flashing. It looks good on paper, but doesn't work that well in practice, especially in heavy snow country.

I've stopped leaks in this detail several times by removing the metal and shingling as described above.

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