One of the biggest problems in designing tiny houses is squeezing as much width possible out of 8 1/2 feet. If you put your walls at 8 1/2 feet then you have no overhang. If you put your roof line at 8 1/2 feet you are giving up precious room width, limiting your interior options. My solution was to have the roof overhang removable and here is how I did it.
This solution requires welding and adds 40 to 60 hours to the house build. Feel free to use my design for your own personal house, this design may not be used for commercial purposes without my written consent.
Lets begin with how I build the brackets.
The piece on the left (with the clamp attached) is made up of a piece of 1/8" x 2" flat bar steel. Welded on to that is two threaded rod couplers which have a piece of threaded rod temporarily installed. This bracket has 4 - 5 holes drilled in it and gets attached to the roof joist.
The bracket on the right has a piece of steel tubing welded to it. This allows the threaded rod to move as it is being placed and tightened with a regular nut. Drill the same 4-5 holes
In the picture the piece of wood is acting like a jig so that everything lines up when it is installed on the house. The gap between the two brackets is for the fascia board. Each pair was numbered to keep them together because it is hard to get the position and angle the same from piece to piece. That is why there is a number 2 on the rafter in the previous picture where I'm marking the back of the fascia.
Threaded rod comes in 10' lengths and was cut to length. When cutting it put few nuts on it, when you take the nuts off it will clean the treads up. They are removable and during transport, you can see
the holes in the fascia board in some of the pictures. I ended up using bolts for the bottom holes to speed up installation and removal.
Send me an email if you have any questions and I'll update this post to clarify.