porch roof - DIY Chatroom

Kurt1968 · 10-15-2009, 11:48 AM

I'm rebuilding a porch. The problem I'm having is the roof has to different runs. It's a wrap around porch the front of the house is 6' wide the side of the house is 5' wide. I want the pitch to be the same. How do I get the rise to be the same?

Willie T · 10-15-2009, 01:24 PM

You either let the 5' roof hang 1' long, or you compromise, and split the difference on the overhangs.... 6" long on the 5' side... 6" shorter on the 6" side.

Kurt1968 · 10-15-2009, 01:37 PM

What i'm asking is the rises are different. So how do i get the rises the same.

12penny · 10-15-2009, 02:04 PM

I dont get it either. If you want them the same then make them the same.

Kurt1968 · 10-15-2009, 02:32 PM

I guess i just wanted help in figureing out the length of the rafters and where to cut the birds mouth.And what angle to cut the top at. Because the length of the rafters is different . I think i'm just over thinking it.

Willie T · 10-15-2009, 02:50 PM

You are not going to be able to have equal rise on both sides unless your rafter bottoms are all landing at the same distance from the house wall. That's what I was trying to express in my earlier post.

Kurt1968 · 10-15-2009, 04:04 PM

ok thanks can i change the angle where it mounts to the house to make them the same?

Kurt1968 · 10-15-2009, 07:44 PM

I gonna just make the other side 6' also to make it easier.

Willie T · 10-15-2009, 11:17 PM

Quote:

Originally Posted by Kurt1968

I gonna just make the other side 6' also to make it easier.

Sounds like a plan.

Wildie · 10-16-2009, 12:11 AM

Quote:

Originally Posted by Kurt1968

I gonna just make the other side 6' also to make it easier.

Yah but, the beam for the short section will have to be higher as the birds-mouths will be further away from the rafter butts.
How are you going to support this beam?
It may be easier to maintain the beam heights and have a different rise for each roof!

GBR in WA · 10-16-2009, 01:59 AM

Just put a ceiling joist under it to raise the heel height at the bird's mouth level cut whatever the rise per foot is. Example - a 2x4 under the rafter if a 3-1/2" rise per foot, a 2x6 under if a 5-1/2" rise, etc., and make up some of the difference at the depth of the b-mouth height cut, just so you have minimum 1-1/2"level cut for bearing. . That is how to do, not what I would do... I would use a 24" overhang at the 6' beam, a 12'" overhang at the 5' beam. The unequal pitch would be on the 5' beam but the tails would line, though the hip would be offset also. Be sure to solid block all rafters for rotation and positive connection to plate or beam (Simpson H-1 or 2.5).
Be safe, Gary

Willie T · 10-16-2009, 12:40 PM

Being a bit on the lazy side, myself, I think I would just either build or order triangle-shaped trusses (all of the same size) and install them all around. Straps and hangers. Yeah, you'd need a hip setup in there, but that's not a big deal.

Joe Carola · 10-18-2009, 03:18 PM

Quote:

Originally Posted by Kurt1968

I gonna just make the other side 6' also to make it easier.

That's the easiest way to frame it and keep the pitch/overhang and height the same. You can also frame it with a 6' and 5' run with the same overhang and height. You will just have a "Bastard Hip" offsetting the corner towards the 5' run side which is the steeper pitch side. This is very common and framed every day.

What pitch were you looking for on the 6' run or the 5' run? What is your overhang? What size rafters are you using?

Kurt1968 · 10-18-2009, 07:59 PM

Alright now how do i figure the rafters its not coming out right. My run is 5'-10 3/4 the rise is 32". Thats what the rise has to be. I know its going to be some bastard size. Thats what you get when you own a 105 year old house.

CookeCarpentry · 10-18-2009, 08:05 PM

What is not coming out right?

You know your rise and run.