Framing A 2 12 Pitch Roof

Resilient asphalt shingles lie much flatter to the substrate than slate tile and concrete which keeps water from being easily blown under them.

Framing a 2 12 pitch roof.

Image 1 12 to 12 12 roof pitch 7 12 pitch. A pitch of 2 12 is the minimum pitch for shingles made of asphalt so your roof just barely makes the cut off for one of the most popular roofing material options. Add the length of the overhang beyond this mark and. It is not ideal for snow or heavy rain but modern materials and proper drainage have helped.

Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. So if the pitch of your roof is 7 12 place one stair gauge on the vertical part of the framing square the tongue at the 7 inches 18 cm mark and place one stair gauge on the horizontal part of the framing square the body at the 12 inches 30 cm mark. If you build a flat roof try to have it slope in multiple directions to drains or gutters.

If this isn t practical then perform the same measurement on the underside of the roof. To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. On the body of the square the longer side input the 12 and input the 7 on the tongue the shorter side of the square by lining up the stair gauges at the corresponding point on the square. We included a roof pitch chart below the 7 12 example image and the calculator below that.

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12. A flat roof has a slope of 1 8 per foot to 2 12. Blind valleys simplify framing.

Position the square at the end of the rafter board with the tongue on your left and facing away from you. Input the pitch of the roof that you calculated above we ll use 7 12 for reference throughout on the framing square. Fix stair gauges on the framing square to mark the pitch. Roof pitch calculator results explained.

Measure form the top of this line down the board to determine the line length or length of the rafter less the ridge.