Determining the ridge beam height.
Roof ridge dimensions.
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Choose a ridge board that is one size larger than your common rafters.
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For 2 x 4 rafters use a 2 x 6 ridge board.
You will need to express this size in terms of square feet.
The ridge board s length will be the outside measurement of the building plus the length of the overhang at both ends.
Specifications all dimensions are nominal width.
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Keep in mind that the average size of a roof is 1 700 square feet so your total will likely be 10 higher or lower than this figure.
Ridge boards and beams.
For example if the slope is 4 in 12 and the run is 12 feet the ridge beam height m will be 4 feet.
If you know the slope x in 12 you want to use for your roof framing design you can use it along with the run r to determine the height of the ridge beam.
Check that your footage measurements are within this range so you can start off on the right foot.
The top end of each rafter is cut at an angle so that it meets flush with one broadside of the ridge board and the ridge is sandwiched between the rafters.