Collar Beam Height Qusetion

kbs2244 · 12-19-2007, 05:27 PM

Been a lurker, but now I need help.
The basic outline of the problem is a built on garage addition. What the R. E. guys call a 2 story Colonial with a Side Loader Garage. That means the gable end of the garage faces the street.
Existing garage is 24 feet top plate to top plate with 5 feet from the bottom of the joists to the top of the ridge board.
There is a 4 foot “Kick Out” on the street side that expands the inside dimension for the original owners boat.
This done with a support wall with a garage door type support across the span at the 24 foot point and with lean to rafters out to outside wall at the 28 foot point.
The end result is a “Cape Cod” look with the back eave lower then the front, “door side” of the garage, and a indoor, dry wall boxed, beam across the span.
The homeowner wants to add on 24 feet of width to the garage with the same depth.
But he wants more inside height.
Current construction is pretty common. 2x6 joists top plate to top plate and 2x6 rafters with 1x6 collar joists every third rafter.
So, can I raise the real joists from the top plates up the rafters to some point?
If so, how far with out hurting the structural requirements?
The homeowner wants as much finished inside height as he can get, but he understands the idea of the forces involved and doesn’t want to build a problem.
He is OK with the need for the support wall at the 24 foot point and the “real” wall farther out.
And then, of course, the next step is to move back into the existing garage and modify the existing joists and rafters so he has the same “dome” ceiling in the whole garage.

12-19-2007, 05:27 PM	#1
kbs2244 View Profile kbs2244 Registered User Send Message Follow Blogs (0) Threads (1) Photos (0) Reviews (0) Projects (0) Toolbox (0) View All Activity Registered User Trade: general Join Date: Dec 2007 Posts: 1	Collar Beam Height Qusetion Been a lurker, but now I need help. The basic outline of the problem is a built on garage addition. What the R. E. guys call a 2 story Colonial with a Side Loader Garage. That means the gable end of the garage faces the street. Existing garage is 24 feet top plate to top plate with 5 feet from the bottom of the joists to the top of the ridge board. There is a 4 foot “Kick Out” on the street side that expands the inside dimension for the original owners boat. This done with a support wall with a garage door type support across the span at the 24 foot point and with lean to rafters out to outside wall at the 28 foot point. The end result is a “Cape Cod” look with the back eave lower then the front, “door side” of the garage, and a indoor, dry wall boxed, beam across the span. The homeowner wants to add on 24 feet of width to the garage with the same depth. But he wants more inside height. Current construction is pretty common. 2x6 joists top plate to top plate and 2x6 rafters with 1x6 collar joists every third rafter. So, can I raise the real joists from the top plates up the rafters to some point? If so, how far with out hurting the structural requirements? The homeowner wants as much finished inside height as he can get, but he understands the idea of the forces involved and doesn’t want to build a problem. He is OK with the need for the support wall at the 24 foot point and the “real” wall farther out. And then, of course, the next step is to move back into the existing garage and modify the existing joists and rafters so he has the same “dome” ceiling in the whole garage.

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Collar Beam Height Qusetion

Collar Beam Height Qusetion

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