Roof Truss question
Posted: Sun Mar 27, 2011 8:43 pm
I must re-roof my storage shed style workshop soon, which will include having to replace some of the rafters damaged by water.
The workshop is 14ft x 16ft and currently has a gable style roof with 1ft overhang on the side with the door. The gable is on the 14ft end. When you look at it, it looks like it was meant to overhang 6" on either side, but was instead installed flush with the back side and overhung 12" on the front. The pitch is even on either side of the ridge board, but it is off-center to the building. The roof system is a simple rafter and ridge board design made of 2x4's. There is one collar beam in the center of the 16ft run. There is much of it that needs replaced as well as all the sheathing.
To quell some related concerns, all the exterior sheathing is going to be replaced also.
This leads me to my roof truss question!
I'd like to "change" the entire configuration of the roof, to include a 2ft overhang on one side and an 8ft overhang on the other side to provide shelter from rain and snow for my Cub and implements. This means no 4x4 posts at the ends of the 8ft overhang. Yes, I am going to take advantage of the townships own stupid zoning law. They tell me I CANNOT add a lean-to that has new posts touching the ground...but nothing says I can't re-roof it in this manner....GO FIGURE.
8ft is all I need to cover the tractor, the building stands between the tractor and the direction the weather shows up...the 2ft overhang on the other side makes the lumber an even 24ft!
I've already priced out all my material needs that I can think of.
So, now the engineering aspect collides with the "want".
I wish to construct W-type trusses (9 of them) to do this. This equates to 24" spacing.
If I use a (1piece) 24ft lower chord out of 2x6 stock, will it handle the 8ft overhang with 1/2" OSB sheathing and asphalt shingles? There will be NO gutter mounted off the 8ft overhang end either.
Will I need to use 2x6 for the upper chords and web members as well?, or will 2x4's suffice for these truss parts?
The upper chords will NOT extend beyond the ends of the lower chord.
Plywood or galvanized gussets?
Anyone have a roof pitch concern? I was going to go with 4/12.
The workshop is 14ft x 16ft and currently has a gable style roof with 1ft overhang on the side with the door. The gable is on the 14ft end. When you look at it, it looks like it was meant to overhang 6" on either side, but was instead installed flush with the back side and overhung 12" on the front. The pitch is even on either side of the ridge board, but it is off-center to the building. The roof system is a simple rafter and ridge board design made of 2x4's. There is one collar beam in the center of the 16ft run. There is much of it that needs replaced as well as all the sheathing.
To quell some related concerns, all the exterior sheathing is going to be replaced also.
This leads me to my roof truss question!
I'd like to "change" the entire configuration of the roof, to include a 2ft overhang on one side and an 8ft overhang on the other side to provide shelter from rain and snow for my Cub and implements. This means no 4x4 posts at the ends of the 8ft overhang. Yes, I am going to take advantage of the townships own stupid zoning law. They tell me I CANNOT add a lean-to that has new posts touching the ground...but nothing says I can't re-roof it in this manner....GO FIGURE.
8ft is all I need to cover the tractor, the building stands between the tractor and the direction the weather shows up...the 2ft overhang on the other side makes the lumber an even 24ft!
I've already priced out all my material needs that I can think of.
So, now the engineering aspect collides with the "want".
I wish to construct W-type trusses (9 of them) to do this. This equates to 24" spacing.
If I use a (1piece) 24ft lower chord out of 2x6 stock, will it handle the 8ft overhang with 1/2" OSB sheathing and asphalt shingles? There will be NO gutter mounted off the 8ft overhang end either.
Will I need to use 2x6 for the upper chords and web members as well?, or will 2x4's suffice for these truss parts?
The upper chords will NOT extend beyond the ends of the lower chord.
Plywood or galvanized gussets?
Anyone have a roof pitch concern? I was going to go with 4/12.