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Thread: Ahoy! Roof Experts
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03-28-2007, 09:28 AM #46
Allen: Scissor trusses are usually for "vaulted" ceilings; cathedral is when you have the ceiling pitch paralleling the roof pitch (I think - I don't have an architectural dictionary). I have a project in WI that calls for parallel chord trusses with a 32" heel height. So, would you call that a "cathedral" ceiling or a "vaulted" ceiling?
Curt Johnson
X5
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03-28-2007, 09:32 AM #47
Paul: If you didn't have to put the pitch on the plans and just went up there and put up a roof that matched ridge heights, no one would ever no that the pitch wasn't 6:12 unless you told them. Not trying to promote shoddy work or anything like that - just trying to think of practical solutions. Good luck in your meeting.
Curt Johnson
X5
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03-28-2007, 10:06 AM #48
I have my wording wrong..
From his first post he said about the 3 1/2 inside pitch..
With trusses it is hard to adjust the pitch after they are made..
Just did a quick check for a ridge beam=4 ply 1 3/4"x18" LVLs...If I did it correct,big if..But I have done 24'x 24' family rooms that took 3 ply 18" or 4 ply 16" done by an engineer..Last edited by Allen42acj; 03-28-2007 at 10:17 AM.
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Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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03-30-2007, 07:30 AM #49
Sorry for the delay in my response.
Allen, in post #27 you have what I would think is the way to go. However, I forgot to mention that the existing roof is a hip and not a gable. This cuts the ridge distance down so I have not been able to duplicate what you.
I hate to admit it but I am stumped trying to get the client a good look. It looks great with a 4 pitch cathedrial and all will match. But, it turns out that the framers want to deal with trusses and not long rafters.
PaulPaul K. Traylor (Design Engineer )
WoodArt Design and Drafting Service
"Great Homes Come From Great Designs"
pktraylor65@gmail.com
North Fort Myers, Florida
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03-30-2007, 08:42 AM #50
Hi Paul
It's not the long rafters,it's the heavy ridge beam.And I don't like them to much either...........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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03-30-2007, 09:57 AM #51Originally Posted by pktraylor
My framer handframed sheated and paperd this entire roof in 2 days with only 2 guys...when it was 11-20° outside. In fact 2 guys framed the whole project in only 1½ weeks..with an extra man to help stand the gable walls one day.
I think framers these days are just getting lazy....with all their pettibones, lifts, and what not...I still carry steel up a ladder on my shoulder to set it in a garage...
Paul - tell your framers you'll being them pizza one day if they do the hand-framing....
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03-30-2007, 10:21 AM #52
3 ply 1 3/4"x 18" x 24"+ by myself..And Big Blue..
Still better than doing trusses alone.. Hate the domino effect...........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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03-30-2007, 10:25 AM #53Registered User Promoted
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Belvedere Skylight
Chris, - Up here, we sometimes call the ridge skylight you show as a Belvedere skylight. I was thinking that you could combine the exterior design feature of this type skylight with a Sun Tube. The Sun Tube is more energy responsible and no doubt brings in more light. Any thoughts or comments on this idea?
ggodwin
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03-30-2007, 10:42 AM #54
PAUL - Go with a hand-framed roof...but use at least a 2x12 for the rafter so you can get R-38 in the ceiling the span is only about 17' at a 4 pitch (easliy with a 2x12spf@24" o.c.)... Keep in mind - the ridge bears no down load...the rafters are carrying all the load the ridge has only horizontal forces acting on it....So, the ridge can be a lesser material than the rafters. It's the rafters that need to consider deflection. You could use an 2x12spf for rafters with a 2x10 ridge in 10' lengths.
George, I've never heard of either of those terms...(ridge skylight or Belvedere skylight). I called this a cupola....
There's going to be a a huge chandiler hanging there...(same as the one in their great room pictured) - over a water fountain.
I'm not familiar with the sun-tube either - how would that incorperate?Last edited by ChiefChris; 03-30-2007 at 10:46 AM.
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03-30-2007, 10:50 AM #55Originally Posted by Allen42acj
Your dormer on the front could be headed off between the rafters and the load on the rafters isn't carried by the ridge...
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03-30-2007, 10:54 AM #56Registered User Promoted
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Have a Sunny Day
I'm not familiar with the sun-tube either - how would that incorporate?Last edited by George Godwin; 03-30-2007 at 11:05 AM.
ggodwin
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03-30-2007, 10:54 AM #57
Chris
Here if you do not have rafter ties and collar ties a structural ridge is required..
Same roofs we did a few years back with just a 2x ridge.Not a safety issue,you might get cracks in the sheet rock..Ones of those things that should be a suggestion,not a code..
Inspectors want to see all the rafter hitting on a ridge..They don't like when the top cut is wider than the ridge...........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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03-30-2007, 11:17 AM #58
"Keep in mind - the ridge bears no down load...the rafters are carrying all the load the ridge has only horizontal forces acting on it....So, the ridge can be a lesser material than the rafters"
WRONG!!!, the ridge has the most load on it, and it has to be a beam unless, as allen has already said, it has ceiling ties designed as a site built truss.
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03-30-2007, 11:22 AM #59
Now I know who to blame=Chris
That gets Lew off the hook
Maybe George will be his lawyer.........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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03-30-2007, 11:27 AM #60
Neal - the ridge bears no down load...it does bear the rafters - but only laterally. You can, in actuality, have rafter top-plumb cuts bearing on each other (back to front) and have the same load transfer as you would with a ridge....see image attached - you do not need a ridge structurally to hold the rafters up - they will support themselves against each other - what the ridge does is keep them laterally.
Allen, it is code now - with the 2006 codes you can't do a cathederal ceiling like that without collar ties within the upper 2/3 of the "attic" area. UNLESS you have it approved by an engineer, or specifically calculate the net and actions on that rafter system. (R802.5 and sub charts).
But - it's all subject to interpretation...Last edited by ChiefChris; 03-30-2007 at 11:30 AM.