I have the task tommorow to frame a hip roof, 6/12 pitch, over a small bay window. The Viceroy plans don’t go into great detail. I have framed hips over square corners, but not a bay. Any usfull info out there?
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Not sure I understand what you have to do. A bay window roof, or a house roof that has to incorporate a bay window below? Bay window roofs (where the roof ties in to the wall) are pretty uncomplicated. House roofs over a bay can get kinda tricky. Someone (I think it was Don Dunkley) wrote an article on the subject some years back in FHB - something about a second hip to break the plane, as I recall. Anyway, can you give a little more clarification?
"...never charged nothing for his preaching, and it was worth it, too" - Mark Twain
It;s a bay in the wall, full height. The main ridge runs perp to the house ridge, then the 4 small hips run off the end of the small main ridge, one at each point of the bay.
Here is a link to purchase the article I was referring to
http://www.taunton.com/store/FHArchive/FHarch_Purch.asp"...never charged nothing for his preaching, and it was worth it, too" - Mark Twain
You'll have 4 hips and two valleys.The three sides of the bay, are they the same size?If they're not the same size and your front wall is wider then the two side walls, then your hips won't be 6/13. They will be different because your hips aren't running at 67.5?.Your two valleys will be 6/17.If your front and side walls are the same size, then the hips will be 6/13 because they will be running at 67.5? because it's the same as an Octagon roof using three equal sides of an OctagonIs your roof something like this?Joe Carola
Yes, i do have 4 hips and two valleys and all 3 sides of the bay are equal and the main roof is the same pitch as the bay hip. I did most of it today, and the 6/13 helped. What the main problem was, was getting my mind around the idea on the hip & valley stopping at the same place, at the spot where the bay walls break the plane of the main wall. the valley then turns at almost a 45 to the facia. Once i understood that, a bulb came on, my head went POP a miracle happened, and it seemed easy, and i hope to never do another. Thanks all for the help.
Joe - here's a sketch of your roof drawing in 3D
edited to add... Oh, yeah, and I added a 2' overhang, just for kicks & giggles.
"...never charged nothing for his preaching, and it was worth it, too" - Mark Twain
Edited 11/3/2006 2:58 am by Huck
Huck,That's one big azz overhang. I haven't tried with the 3D yet, but I'll try soon.Joe Carola
24" - standard fare here in sun country"...never charged nothing for his preaching, and it was worth it, too" - Mark Twain
Your sketch shows the roof to the wall. It was the overhang that hung me up (pun intended).
Did you set the valley or hip first?I hope you took picture of this before you sheathed it. If not can you take the sheathing off and take some?.......;-)Joe Carola
No pics, but it is burned into my harddrive.
Thgis post is from another thread using a 5/12 pitch and the drawing is using a 5/12 pitch.
If the bay roof is 45°, it's the same as when you frame an Octagon roof, the hips run at 67.5° and you hold the framing square whatever the pitch is /13 and the jack rafters you will cut the cheek cut angle with the saw set at 67.5°.
A regular hip runs at 45° and you hold the framing square whatever the pitch is /17 and the saw setting for the jack rafter cheek cuts are always 45°.
If your bay projects 2’ past the house, then it’s like cutting a 2’ section off a Octagon Roof. Your hips are still running at 67.5°. So the hips on the two outside corners will be 5/13 as in your example. If a jack rafter hits those hips, they would have a cheek cut with the saw set at 67.5°.
The rafter that runs up against the wall that sits on the longest points of the outside corners of the bay are running at 45° t0 the angled side bay walls. That will be cut as if it were a hip with the framing square set 5/17.
I just framed one last week and the width of the bay was 7’ and the front wall was 3’ with a 2’ projection with a 9/12 pitch.
Your roof with a 5/12 p[itch, your 5/12 commons would sit on the front 3’ wall. The two hips on the outside corners of the 3’ front wall would be 5/13 and the rafter up against the house would be 5/17.
I include the overhangs also.
This is the right way to frame a bay roof in my eyes. Sometimes you get a set of plans that wont show the bay roof running at 67.5°, it shows the front roof running square and the same width as the front wall. I don’t think they look good and your angled walls will always have a smaller overhang that way.
Framing and Joinery Angle Calculator: Enter any pitch, any pitch, any angle in plan measured between the Hip eaves. There are links to diagrams, descriptions of the more commonly used angles and formulas in case you wish to validate the numbers returned by the calulator.
Joe Bartok
Edited 11/2/2006 9:30 am ET by JoeBartok
Wow, never knew that, but it makes sense. Thanks for posting that!"...never charged nothing for his preaching, and it was worth it, too" - Mark Twain
Any time Huck.Joe Carola
Hey thanks. The pitch /13 makes sence. The pitch/17 is not needed as the hip roof runs into the main roof. Sounds easy now, except for the 1/2'' of frost that came in overnight. Thank heaven for propane weed burners...
Is the main roof picth a 6/12 also?Is the re a header going across the bay wall and main rafters sitting on top of the header and the bay valleys are false and lay on top?Joe Carola
The main roof is a 6/12 and the header spans the opening to the bay. Thanks, john