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Thread: Ahoy! Roof Experts
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03-28-2007, 08:20 AM #1
Paul:
Why not squeeze the overhangs and then change the pitch to match the other ridge height (you can halve the ceiling pitch to whatever it ends up being). The truss guys will build to any pitch you tell them. Since your customer is wanting a different roof pitch, give him one that architecturally looks better since I doubt that changing the width of your addition is in the picture (or shortening the wall heights).Curt Johnson
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03-28-2007, 08:51 AM #2
Not sure put I think they want that pitch to get the cathedral in it..
Is that one big open room?.........
Allen Colburn Jr.
Pascoag RI 02859
Residential Design Drafting/Framer
Drafter for:
http://www.artformhomeplans.com/
Chief Architect X4
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03-28-2007, 09:26 AM #3
Curt,
Two possiblities. I will address them today.
Allen,
Yes they want a vault ceiling so they can use trusses. The outside is 6/12 then the inside is 3/12.
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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03-28-2007, 09:28 AM #4
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
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03-28-2007, 09:32 AM #5
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
Puget Systems Custom Computer, Win 7 Pro 64-bit SP1, 3.3Ghz Intel Core i5 2500K Quad, 8 GB Kingston DDR3-1333 Ram, Intel X25-M 80 GB SSD App Drive, WD 500 GB Caviar Blue SATA 6 Gb/s Data Drive, EVGA GeForce GTX 550 Ti 1024MB VC, Antec 650W PS, Asus p8P67 Pro REV 3.0 Motherboard
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03-28-2007, 10:06 AM #6
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.
.........
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, 08:42 AM #7
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, 10:21 AM #8
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, 10:50 AM #9Originally 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, 10:42 AM #10
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, 10:54 AM #11Registered 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 #12
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 #13
"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 #14
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 #15
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.