Shed Rafter Detail

timber frame shed rafter detail for a porch

 

Using a ledger, a post and plate system along with shed common rafters is a fast and effective way to construct an exterior porch or storage area.  In this shed rafter detail the 4×8 rafters are housed into the upper ledger 3/4 inch and secured with an 8 inch structural screw.  At the plate the rafters are housed on the outside of the plate 3/4 inch and secured with at least a 10 inch structural screw.  The housings are added not only for added strength but to insure the cleanest looking joinery for years to come.

 

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2 Responses to Shed Rafter Detail

  1. Jacob November 7, 2017 at 11:45 am #

    This seems to be an effective way to design and build an exterior timber framed porch. I am concerned with mounting this ledger board properly to the wall given that my walls have 1.5″ rigid foam on the exterior. Do you have a method for doing this without creating a thermal bridge in the external insulation plane?

    • Brice Cochran November 8, 2017 at 8:30 am #

      That is a tough one. Cannot think of a way to completely not pierce the insulation plan. You can minimize this it by adding half posts under the ledger to create a free-standing structure, but even then you are going to want to join it to the main house or building with some fasteners. Would love to hear what your solution finally is.

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