post/plate/tie joint

[shackbuilder]

Anyone aware of a joint that brings the tie up to the top of the post with the top plate beam, without using a jowled post?  This is for a common rafter setup that will be step lapped into the plate.  I was going to have the tie come into the post 1' down from the shoulder with a wedged half-dovetail in a thru mortise, but the building is 24' wide, and i am worried about thrust stressing this joint and the post top tenons.  Roof pitch will be 12/12. Should i be worried, or is collar ties on every rafter set enough to eliminate the thrust.   Closest thing i have found is this, but as i see it, it jams me from including my 1' overhang on the rafters -  http://timberframehq.com/tie-beam-plate-tying-joint/
  Thanks for any thoughts on this.

[Jim_Rogers]

One solution is to add a sprocket onto the side of the rafter to give you the overhang;



 

Hope that helps.

Jim Rogers

[Roger Nair]

To deal with the thrust issue, the simplest (to me) method is to avoid the collar related issues by having a post supported ridge, which will pickup one half of the roof load and place a substantial limit on thrust and ease stress on the tie joints.  Remember the thrust in a collar system is relentless and wood will deform and any weakness will be exposed in time.  A drive in the country will have on display many swaybacked, bulging buildings.

[shackbuilder]

Trying to keep the ridge open in a cupula area, so there will be two heavier rafter sets headered off to carry the three rafters in that area.

[Dave Shepard]

Three way joints are tough, and more so if you don't use a jowled post and even more so with high thrust loads. Could you use a purlin plate to pick up the rafters mid span?