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King Post with Steel All Thread

King Post Post and Beam Joinery

This king post with steel all thread uses a bit of hidden  modern technology to strengthen the joinery and avoid taking too  much “meat” from the timbers.   

A king post truss is one of the most common types of trusses and is a very strong one, since the bottom chord prevents spreading. This example  is a Haunched King Post. The top chords have stub tenons (tenons that extend all the way across the face of the timber) and the sides of the king post are beveled to create a shoulder for the top chords to rest upon. That creates an attractive assembly.

In order to avoid having to cut too much wood  away from the king post, this example uses steel All Thread rods to tie everything together. This  allows faster cutting, fit up and assembly.  The all thread is inserted into notches cut into the top chords and through a hole bored into the king post. Since this occurs at the top of the timbers, the metal is not visible and the entire assembly appears perfectly traditional. The ridge beam is set into a shoulder cut into the king post, and secured with hidden structural screws.

Using hidden metal connectors in this fashion  has become more and more common. It is a great way to strengthen the frame without sacrificing the beauty of traditional joinery. 

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king post with steel all thread

4 thoughts on “King Post with Steel All Thread”

  1. Hi Brice

    Big Thank you for posting these amazing joinery details, makes understanding them a lot easier. I am working on a housing project and wanted some information and CAD Details for joining Timber frame with steel connectors. I wonder if you can send me any floor/wall/roof details please, will be much appreciated.


  2. Hi Brice–

    I’m curious why you did not use a tenon at the end of the ridge beam going into the king post? I was thinking a housed tenon with mortise about 1/2 way into the king post, pinned. Why not that instead of the structural screws? My rafter beams are coming into the king post below the ridge, so I don’t think there would be an issue with removal of too much material in that part of the king post.



  3. Adding a tenon is one way to go there for sure, think I will add that example to my list of to-dos. There is a lot going on at the top of the king post and so my go-to is simple and strong. I find the screws with housing the simplest way in this case. At some king post to rafter connections, a tenon is used. In those cases putting in a tenon would take too much wood out of the king post.

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