This timber detail exploded view is of a collar beam which is a 4×4 connecting to a 4×6 rafter. The pitch is 12/12, and the tenon is set off the reference face 1 1/2″ and then 1 1/2″ thick, with a 3/4″ hardwood peg.
Here is an exploded view of a pair of purlins 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 off wood, and possibly other factors will have to be considered when designing this joint. My examples are [...]
This joint is known as a “step lap rafter tail” and the joint in the plate is known as a step lap rafter seat. I believe it gets it name as the tail laps over the plate which creates an overhang to shed the rain water away from the side of the building. And that [...]
This joint is known as the tongue and fork joint. Here is an exploded view of two 4×6 rafters at 12/12 pitch with 1 1/2″ tenon set 1 1/2″ off the reference side with a 3/4″ oak peg. These rough sawn rafters have also been reduced down to the next smaller 1/2″ in size at [...]
This is an exploded view of a rafter foot and seat on a plate. Here you can see the plate with post below. And the rafter with a notch cut into the back side of the plate for the rafter foot is sit on. The toe of the rafter has been trimmed to the outside [...]
This is a view of a step lap rafter seat on a 8×8 plate. The joint gets it’s name as the rafter laps over the plate to create an overhang for shedding rain water off the roof away from the side of the building. And as the notch looks like a stair step. The amount [...]