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Community and Q&A

Chainsaw retrofit / new overhang detail

dirkgently | Posted in Green Building Techniques on

Looking for opinions and pics of any added overhangs after old ones cut off. Roof is getting 6″ rigid foam and will have 2×4 on top of foam with plywood on top of new 2×4. The 1.5″ venting channel will be maintained soffit to peak to reduce possibility of ice dams.
I am in day 5 in my project and starting to stress over the soffit details of overhang and how to maintain the venting. I was planning on using vented drip edge. Any other suggestions?
attached pic is one of few I have found which uses a vented approach. Any links to other photos is much appreciated.
And no, I am not using a chainsaw to remove existing overhangs, just generic name for process.

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  1. charlie_sullivan | | #1

    I recommend that the "rainscreen" vent space behind the siding not connect to the vent going through the roof, so that when the snow-free siding gets warmed by the sun, that hot air rising could cause ice dams it it went under the roof.

  2. GBA Editor
    Martin Holladay | | #2

    For more examples of applied overhangs, look carefully at all of the photos and detail drawings that illustrate these two articles:

    Airtight Wall and Roof Sheathing

    Getting Insulation Out of Your Walls and Ceilings

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