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Should I do a birdsmouth cut for low sloped (tiny house) shed roof?

GreyWolf92 | Posted in Green Building Techniques on


We’re getting close to framing my roof for my tiny house on wheels. The roof is a low sloped 2:12 pitch. There will only be 3-6 inch eave/overhang.

Should I do a birdsmouth cut for this? What benefits does this provide? If not, what method do you recommend that I do and why?


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  1. GBA Editor
    Martin Holladay | | #1

    Yes, you need a shallow bird's mouth. These days, most builders also use a hurricane clip (Simpson clip) as well.

  2. GreyWolf92 | | #2


  3. Expert Member

    Grey Wolf,

    There are two benefits to including birds mouths.

    - It increases the bearing area so the corner of the rafter doesn't crush under load.

    - It provides a horizontal bearing surface so all loads are vertical. Witpout the horizontal surface you also would have loads trying to make the rafters slide off the roof.

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