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Old 04-01-2018, 06:38 PM   #1
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vaulted ceiling project


new to the forum
i have read a few items online
yes, i should consult with an engineer
but, lets hear what you think:

I am working on a project to vault the ceiling in my second story bathroom
the bathroom is 8x10
the inside wall is 8' in from the outside wall and 10' long
the flat ceiling right now measures 8' tall
it is my idea to raise the inside wall up to 12' to meet roof rafter
adding additional 2x4 rafter tie on every rafter
these are spaced 16" apart
supporting the roof with the full height wall and also connecting it back to the rafter across the way

original framing
2x6 roof rafters
2x8 ceiling joists

i have attached 2 photos
i hope they come thru

your opinion is valued
thanks for the help
Attached Thumbnails
vaulted ceiling project-original.jpg   vaulted ceiling project-new.jpg  
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Old 04-01-2018, 07:28 PM   #2
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Re: vaulted ceiling project


I don't think I have ever in my working life seen an engineer spec collar ties. Usually they want a ridge beam. Mind you, I've always built where there was snow. Anyway you can get a ridge beam in there?

Not saying what you propose wouldn't work. Last house I had had a 12x16 kitchen that a previous owner had removed the ceiling joists and made it a vault, with no ridge beam, no collar ties nothing. That worked fine. But when you get an engineer involved.....
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Old 04-01-2018, 07:41 PM   #3
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Re: vaulted ceiling project


sorry,
no, i have not consulted with an engineer
it just seems every site i go to, the first thing i see is
"hire a structural engineer"
i would think with my new framed in wall and additional collar ties
i would have the support i need
now, i call these collar ties but again in everything i read
you collar ties should but in the upper third of your rafter length
and the bottom "rafter joists?" should be in the lower 1/3 of the rafter length
my new ties are probably about dead center in the raft length
maybe a little below

i too have seen some framing in my day that makes me scratch my head,
just looking for some opinions and ideas

thanks for the response
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Old 04-01-2018, 08:15 PM   #4
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Re: vaulted ceiling project


Are you getting a permit. If so, you might need an engineer anyway. If not, then what you propose will probably be fine. I would be very careful about your connections. I would thru-bolt those collar ties to the rafters. And why not one on every rafter instead of every other?
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Old 04-01-2018, 08:23 PM   #5
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Re: vaulted ceiling project


We can advise you consult an engineer but we are not the ones requiring it. It is your building department that would most likely want to see a stamped set of plans. Last person I helped with house hunting every house I reviewed for them involved a stop at the local town office to see what permits had been pulled to insure proper construction and inspection. Very few had followed the rules and it greatly affected the offer if at all. In one case a major remodel had been done without ANY permits and the clerk at the office was upset. I know the property came off the market the next day but don't know what penalties they faced.

I don't see your climate so can't factor in a snow or wind load, but that shape is probably possible with the right materials.

Bud
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Old 04-01-2018, 09:37 PM   #6
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Re: vaulted ceiling project


A ceiling joist is a rafter tie and need to be no higher than 1/3 the height of the roof so that might limit your height and require the new ceiling joist to continue to the far rafters. If not you have a bending moment at the join between the 8 ft high wall and the 4 ft wall above that, so you might be asked for full height studs in the wall.

I would not be surprized if you were asked to do both, neither being a big deal.
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