In a hexagonal timber frame where the plates around the perimeter join the with principal rafter is a bit tricky from a engineering stand point. This is just one solution and in this case a steel post was used instead of a timber post. After the last detail I thought a follow up to the […]
Just the housings and rafters to cut this boss pin detail would certainly challenge any timber framer. The central post is typically called a boss pin, and it is used when you have several hips and valleys coming together at the same spot. This detail comes from a hexagonal frame, and has the lower struts […]
While joining a strut from a king post or bottom chord is a simple timber frame joint to cut it is important to look at the connection details. In this upper king post strut to rafter detail we use a 3/4″ housing, and because we are using white oak a 1 1/2″ tenon and two 1″ […]
A classic joint for a king post to rafter connection uses a 1 1/2″diminished housing, and because it is designed for oak it uses a 1 1/2″ tenon. This upper king post joinery is a classic and strong connection. As always, make sure you check with a qualified engineer before you begin cutting joinery on your frame.
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 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 […]
Here is an exploded view of a birds mouth rafter foot where it meets the plate. A typical timber frame joint where a rafter meets a plate is called a birds mouth and this is a great isometric rendering of this type of joinery.
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 pair of 4″ x 9″ timber frame rafters where they meet at the ridge. They are connected with a half lap joint and peg. The roof pitch is 8/12 and the peg is a 3/4″ x 10″ peg.