Purlin Joints at Rafter

Timber Frame Purlin JointsHere is an exploded view of a pair of purlin joints where they meet the rafter.

Each frame design should be reviewed by an experienced timber framing engineer for the exact design of this joint.
Loads, spans, type of wood, and possibly other factors will have to be considered when designing this joint.

My examples are only examples of two different types. One cut with a curved cut on the bottom and one is just reduced.
Only an engineer can give the exact sizes of these joints.

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2 Responses to Purlin Joints at Rafter

  1. Mike M August 8, 2014 at 3:35 am #

    Do you ever use a dovetail joint to lock the purlins onto the rafter?

    • Brice Cochran August 8, 2014 at 8:23 pm #

      Mike,
      It certainly is a great option but I find a good screw like a GRK RSS works well to hold things in place. It is certainly easier not to cut the dovetail as well.
      Brice

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