Howto Determine Where Roof Ridge Lies

The building line is the point from which you start to calculate the run of your common rafters to the centerline of the roof.

Howto determine where roof ridge lies. In this video i will look at how to calculate the length of the ridges on a broken hip and valley roof. 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. As a reminder please don t forget to add height of rafter thickness of roofing material and ridge vent to the number that you ll get using our calculator. Using the end common rafter length i calculated the ridge at 6 3 8 by taking the length of the bldg of 112 minus both end common rafters of 105 5 8.

This will be the third of a series of three videos if. Enter square footage calculate or enter the square footage of the attic or area to be vented. When you reach the top of the roof run your last row long photo 6 and drape the paper over the peak top ridge onto the other side. You will need to express this size in terms of square feet.

Using the run of 4 i calculate the ridge at 16 length of bldg of 112 minus run on each end. The first step in a free roofing estimate is measuring the roof dimensions. If you ever wondered how to figure your overall building height or roof height here we have a calculator to make life a little easier for you. Which if either of these calculations is correct.

I also assume you ll be using a 2x material for the ridge board. Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator. That way you ll end up with a watertight ridge. Subtract the shorter wall length from the longer wall length and add 1 5 inches for the length of the ridge beam or board.