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Community and Q&A

Building and Detailing Eave Overhangs

Richard Hertz | Posted in Green Building Techniques on

Hello! Am looking for any detail drawings or advice on how best to implement screw/bolt-on roof overhangs for a chainsaw retrofit.

I have found this article from Building America and BSC, but it focuses on gable ends. Does anyone know of something similar for the eave ends where the roof framing meets the facia? Or could this apply to eaves as well?

Many thanks in advance!

https://basc.pnnl.gov/resource-guides/framing-gable-roof-overhangs

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Replies

  1. Expert Member
    Michael Maines | | #1

    Richard, Mike Guertin has an article and video about how we did it on the 2016 Fine Homebuilding house that I designed: https://www.finehomebuilding.com/2016/09/07/building-trimming-eave-overhangs.

  2. Richard Hertz | | #2

    Michael - that is great, thank you. Now that you’ve designed this detail and seen it built, would use it again? Or do you think there are easier ways to air seal the roof-to-wall interface for new homes or retrofits getting exterior insulation on the roof and walls?

    This is for a garage that I’m turning into a workshop. Thank you again!

    1. Expert Member
      Michael Maines | | #3

      Richard, I've used a similar detail many times and think it works well. There were some odd aspects about that particular design but the basic idea is that bolted-on eaves can work.

      My personal preference is a Sarking membrane roof system: install a high-performance WRB directly over the rafters and seal it to the wall's WRB, run 2x furring over the membrane at each rafter, then install sheathing (or strapping for metal roofing) over that. It's an approach I learned from Chris Corson at Ecocor and I don't think there's a better way to vent a roof. Eaves are bolted on after the WRB is complete. Its main drawback is that builders are not used to installing things in that order and some don't like installing a membrane without sheathing.

      On most projects, however, I transition the air control layer from the wall sheathing to the ceiling plane, using various techniques.

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