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Old 12-19-2013, 02:47 PM   #31
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slanted roof at 5:12 pitch


Thanks polecat. Spoke with insurance agent that's underwriting my home and anything under 3:12 is considered a flat roof and considered ineligible for home owners insurance. I am talking to a contractor to cone up with a design of 5:12 at a he highest point 3:12 at the center and we are thinking 1:12 at the back. Uuughh a work in progress.

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Old 12-19-2013, 03:25 PM   #32
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slanted roof at 5:12 pitch


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Thanks polecat. Spoke with insurance agent that's underwriting my home and anything under 3:12 is considered a flat roof and considered ineligible for home owners insurance. I am talking to a contractor to cone up with a design of 5:12 at a he highest point 3:12 at the center and we are thinking 1:12 at the back. Uuughh a work in progress.
You lost me on that one, you do understand that 5/12, 3/12 etc are angles that the rafters sit at don't you. For example, a 5 and 12 pitch the rafter sit at a 23 degree angle. The reason it is called 5/12 or 8/12 etc, that is the numbers on a framing square that are used to get the angle or pitch of the roof.
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Old 12-20-2013, 08:57 AM   #33
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slanted roof at 5:12 pitch


Sounds like you have your heart set on a shed roof. By that I mean a single plane with no ridges or valleys but a slope great enough to appease the insurance nazi. Solution would be 4:12 pitch. This equates to 4 inches of rise to every 12 inches of span. If the distance to span is 30' The short wall would be 8' high the other wall would need to be 18' high. That is a bit extreme. Go with a 4:12 gable with a center ridge. Easy. Move the ridge away from the center then you will have a different pitch on the two planes. Not as easy.
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Old 12-20-2013, 10:30 AM   #34
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Thank you Polecat honestly my desire for a she'd roof as a diy project on a 28 ' spam is not going to happen.. but I do understand the gable roof system very well it is pretty simple and something that I can actually achieve.
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Old 12-20-2013, 11:31 AM   #35
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Hello everyone I would like some pointers on doing a slanted roof at a 5:12 pitch over 900 sq. Ft home I am building. I am considering spray foam insulation which cancels the need for soffit but I am stuck on getting started. Any advice? I did manage to get all the ceiling joists done and i am in the process of doing wind bracing, but the roof is near...Thanks in Advance
spray foam in the roof. question for you what are you going to do when the roof leaks or fails? and you have zero clue your roof is leaking because the water is trapped behind the spray foam??? just something to think on.
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Old 12-20-2013, 08:42 PM   #36
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spray foam in the roof. question for you what are you going to do when the roof leaks or fails? and you have zero clue your roof is leaking because the water is trapped behind the spray foam??? just something to think on.
Wow I have never thought about that... i was just told that the foam was mildew, water, and mold resistant, and seals the house eliminating the need for soffit and attic vents. Humm that is a very good question. . Just thinking right off wouldn't the wood and shingles and all off that very hard work get totally ruined??? Wow and that stuff is so super expensive. If it ruined my joists or roof I would be ticked
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Old 12-21-2013, 03:36 AM   #37
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Wow I have never thought about that... i was just told that the foam was mildew, water, and mold resistant, and seals the house eliminating the need for soffit and attic vents. Humm that is a very good question. . Just thinking right off wouldn't the wood and shingles and all off that very hard work get totally ruined??? Wow and that stuff is so super expensive. If it ruined my joists or roof I would be ticked
I live here on the coast and our local building dept. will not let us use it for that fact. yes it is water proof and all the good things you stated but there has been things that have happened and water traped between the sheathing and the insulation causing rot.
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Old 12-21-2013, 03:43 AM   #38
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Big Jim the walls are correct but i do have another question. I know you are in Tennessee and i am in southern Texas but maybe you have seen it too. I was watching a house being built in a master planned community and the guys were putting house wrap and then hardie planks, no plywood or osb. I asked and I was told that on that house the interior walls were going to be wood planked so there was no need for sheathing. .. I tried explore it further, but wouldn't that do something to the structure long term??? Just wondering
Sheathing is a must! 1/2 inch or 5/8th ply wood five ply CDX Min and I would have skinned the walls before I raised them. that sheathing gives your walls shear strength.
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Old 12-21-2013, 07:41 AM   #39
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I have been watching videos on YouTube I am practicing on wood to make sure I have it done on the roof rafters. I would love any advice you have on roof rafter measuring
Go get yourself a "swanson" brand speed square, they come with a very helpful booklet on roof framing. a set of "stair buttons" for your framing square make marking the birds mouths a breeze. Good luck!
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Old 12-21-2013, 11:29 AM   #40
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Sheathing is a must! 1/2 inch or 5/8th ply wood five ply CDX Min and I would have skinned the walls before I raised them. that sheathing gives your walls shear strength.
Not to sound slow but what does skin the wall mean???
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Old 12-21-2013, 11:41 AM   #41
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Not to sound slow but what does skin the wall mean???
while the frame of the wall was on the ground you put the sheathing on it then raise it. instead of hanging it after the fact. a whole lot easier. and also the sheathing is the skin of the struture the house wrap can be seen as the underwear and the siding the protective clothing of your house. Hope that helps.
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Old 12-21-2013, 12:12 PM   #42
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I wanted to put the sheathing on but those that were helping were complaining that they would be too heavy to lift. I will never forget it skin, panties, clothing lol I love it
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Old 12-26-2013, 12:12 PM   #43
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Since I am doing a gable roof the span is 16 ft from the center how would I determine how long of a board I would need
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Old 12-26-2013, 03:15 PM   #44
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slanted roof at 5:12 pitch


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Since I am doing a gable roof the span is 16 ft from the center how would I determine how long of a board I would need
A number wouldn't help you. Rafters are not as simple as joists. You need to understand rafter geometry or someone will have to draw it out for you. You may get lucky and someone will make that drawing, but I recommend learning instead. A book or the Internet will go a long way.
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Old 12-26-2013, 03:32 PM   #45
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slanted roof at 5:12 pitch


17 feet 4 inches less 1/2 the thickness of your ridge board, plus the over hang you are planning to have.

"A" squared + "B" squared = "c" squared

A squared 16' feet X 16' feet (convert 16 feet to inches) 16 X 12=192

192X192=36,864

B squared 80" X 80" = 6,400 (16X5 5 being the pitch of the roof)

36,864+6,400=43,264

sq root of 43,264 =208

208 divided by 12" = 17.333333'

.33333 of a foot = 3.99996 rounded up to 4 inches

Answer is 17 feet 4 inches line length from plumb cut to back of plumb cut of the bird's mouth.

You must take 1/2 the thickness of the ridge board from this.
You must add the over hang to this.

Are you running a tight cornice or a over hang with sofit.

Don't forget to take the thickness of your sheathing out of the birds mouth.

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