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can someone please leave me a few tips of hand framing roofs….specially a easy tip on finding out the actual height to place my ridge board. I am always forgetting the formula..help!
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Jeff try this simple one, heal hieght +(run x rise)= top of ridge.Happy Halloween.
JIM AT GREAT WHITE.
*Jeff,1) take half the span of the roof and then subtract half the thickness of the ridge board from it. This gives you the actual run of the common rafters. you can also use it to find the RISE of the ridge board.EXAMPLE: Span = 24' 6", ridge board thickness is 1 1/2", pitch of roof is 8/121/2 x 24' 6" = 12' 3"12' 3" - 3/4" = 12' 2 1/4" = run of common rafters12' 2 1/4" run @ 8/12 pitch = 8' 1 1/2" RISE2) ADD the plumb measurement above the birdsmouth heel cut to this RISE. For example, let's assume that the common rafters are 2x6's and when you cut a birdsmouth on the rafter that has a 3 1/2" seat cut, the plumb measurement that remains is 4 5/16". You must add this measurement to the RISE 8' 1 1/2" + 4 5/16" = 8' 5 13/16"That's how much higher the top of the ridgeboard is above the top of the wall plates.3) Let's assume that the ridge board is a 2x8 and the actual width of it is 7 1/4"SUBTRACT the width from the above measurement8' 5 13/16" - 7 1/4" = 7' 10 9/16"If you cut some posts to this length and prop up the ridge board above the plates with these posts, it should put the ridgeboard at the proper height, unless there is a "dip" or a "hump" in the wall at the locations of the posts, in which case, you'll have to make some minor adjustments.Generally speaking, in many situations, is easier to cut some common rafters let them determine the height of the ridge board for you, then add the posts later.However, if you are working alone, or perhaps with only one helper, posting the ridge board up first might be the way to go, especially when the ridge board is long and heavy. If you do, don't worry about getting it perfectly plumb from side to side. Let the common rafters do this job for you when you nail them up.Good luck
*Jeff,
Joseph FuscoView Image"The price of apathy towards public affairs is to be ruled by evil men." -- Plato
*Jeff....Try reading the little book that comes with any framing or speed square...or if you're lazy, buy a construction calculator and learn how to use it. Always draw a sketch.If all else fails, hire a good framer and go fishing!!!!
*If you like to read books, there is a book called Advanced Framing Techniques from aticles in the Journal of Light construction. Some of the articles get a little heavy in the math department (something I don't mind as an engineer). I framed a 24x36 garage with a dutch hip roof (15/12 pitch) with a gable off of one end and 3 dormers all from aticles in that book. This was my first attempt at any kind of framing. The garage is still standing too.