Timber frame garage

[Don P]

This is a good set of details to keep in mind. This is from the code referenced AITC manual;
AITC 104 all pages2 L01 (1) (plib.org)

Note details  8.1&2*, A5-7, A12,
The sloped bearing seat rather than notching thoughts in there.
* I like the rafter top diagram in my old manual better than the one in the link to the current manual. Notice they were thinking about what happens as the joint rotates and tries to crush the fragile tip. They are connecting better across the top than leaving a gap but are thinking about what is going on under load. Fast forward 35 years and it is lost knowledge, dang dummydown.


 

For those following the scarfing conversation, detail 3 & A9 is the glulam connector.

[cbecker]

As far as the drop in joists.  The reason I had picked that joint was that I am not sure that I will have all the lumber cut for the joists before raising and was planning on adding the loft at a later time. 

The rafter foot I originally had was the step lap but then went to the housed birds mouth when I switched to structural ridge to make cutting easier.  I like your rafter foot.  It makes cutting easier and quicker and then also gives me a rafter tail for and overhang without adding sprockets which I lost going to the birds mouth.  

Thanks for the teaching me more about Sketchup.  The layers are very handy.  I used to just group things and move them out of the way. This way is much easier!

Also a question about calculating the load on the tie beams from the ridge posts.  It is a point load but if there is a post under the beam directly below it that load gets transferred down to the foundation through that post correct?  So it doesn't need to be added to the total load on the tie?  Am I thinking this correctly or way off base?

[Don P]

Set the joists on top of the ties or use hangers later.  Its form might not be as pleasing but the function is certainly superior. If nobody from the county is helping keep you safe I've welded what I consider to be rather handsome fairly unobtrusive hangers for odd sized beams and then done the connection math to make sure they were capable.

The real lowdown on the post is, the upper post is allowed to offset left or right along the tie up to the depth of the tie. Or, the real rule of thumb to take away. Loads can travel at up to a 45° angle through materials to the bearing and still be treated as a vertically supported load. Most of the time  :D. The load path of the ridge is straight down the center row of columns to adequately sized footings sized for the load and soil bearing capacity and is not loading the ties.

Ahh here we go, lets say an 8x8 column is carrying sufficient load that based on the load and the soil bearing capacity it requires a footing 2' square. If you center an 8x8 on a 24x24, the concrete extends 8" beyond the post horizontally in all directions. How thick do you make the footing, at least 8" thick. Draw an imaginary line from the bottom corner of the post to the bottom corner of the footing, 45, you will drive the footing to china before punching through it.