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hick23 05-13-2013 11:43 PM

How to frame a curved porch roof
 
Hello, I'm adding a porch and am wondering how you frame a roof like on the front porch of this house. It's a cathedral ceiling, but the beam is not supported on the front or doesn't appear to be and there are no collar ties to stop the sides from pushing out. Does anyone have any information on how this would be framed?

http://archadeck.files.wordpress.com...y-maryland.jpg

GBrackins 05-14-2013 12:08 AM

they could have used rafter ties. a rafter tie is a means of constructing a structurally sound roof without the need of a ridge beam or ceiling joists. basically if you measure from the bird's mouth (where rafter sits on beam) to the ridge a rafter tie would be located in the lower 1/3 of that distance. it is normally installed on the side of the rafters to connect them together and looks like the letter "A". if the rafter tie is located at the bird's mouth we would normally refer to this as a ceiling joist.

you would then frame the barrel vault ceiling using the rafters and rafter ties.

Hope this helps.

roofguy 05-14-2013 04:57 AM

I frame barrel vaults, most of the time I use 4x8 to sheathing make my arches. then make multiple patterns. then strap it with ferring. hope that helps

sixeightten 05-14-2013 06:40 AM

The front arch there also serves as a collar tie.

oh'mike 05-14-2013 07:15 AM

Front of the arch is often made of a doubled sheet of 3/4" ply (1 1/2") that is plenty of strength to keep the structure straight----

Willie T 05-14-2013 08:05 AM

Interesting. I'd almost bet that roof would be done with small scissors trusses today.

GBrackins 05-14-2013 11:14 AM

scissor trusses would certainly work!

hick23 05-14-2013 10:25 PM

I like the idea of the plywood. I'm not too sure if I could get scissor trusses that could spand the 9 feet I have to span but I will look into it.

Willie T 05-15-2013 08:38 AM

Quote:

Originally Posted by hick23 (Post 1179647)
I like the idea of the plywood. I'm not too sure if I could get scissor trusses that could spand the 9 feet I have to span but I will look into it.

Do you feel it is too short a distance?

mae-ling 05-15-2013 10:35 AM

I could get Trusses including scissor trusses any size I wanted.
The idea of double 3/4inch plywood for the gable end is good.

GBrackins 05-15-2013 11:09 AM

if you're looking to use plywood for the ceiling of a barrel vault ceiling I'd recommend checking out the required bending radii for plywood from the Engineered Wood Association.


http://www.apawood.org/level_c.cfm?c...s&pubGroup=tch

sometimes it is easier to use two layer of thinner plywood that attempting to bend a thicker panel.

mj12 05-18-2013 05:23 AM

wow, who put all those plumbing vents on the front of that house.

oh'mike 05-18-2013 06:23 AM

Quote:

Originally Posted by mj12 (Post 1181727)
wow, who put all those plumbing vents on the front of that house.

I'll meet you there with a case of Hula Hoops --we can play 'roof top ring toss'---:laughing:


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