How To Do A Roof Valley On 12 Pitch

Roof pitch is measured in a rise to run ratio with the vertical rise always shown first.

How to do a roof valley on 12 pitch. The three methods to shingle a roof valley. Therefore the pitch of the valley rafter is 12 in 17. At this moment we are stuck on how to bend our valley flashings for a 16 12 pitch roof. Divide the rise by the run the run is 12.

In this video we ll flash the valley. This recommendation includes iko s premium shingles. On the common rafters the plumb cut is marked with a framing square for a 12 in 12 pitch 45 and cut square i e no bevel. 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.

You ll have a steeper part of your roof turning into a lower slope so there s a steeper pitch up top and a lower pitch on the bottom. First clean the debris out of the valley including sawdust nails and whatever else is in there. In a previous video we covered how to flash roof edges before shingling. When deciding how to shingle a roof valley you will need to consider your materials the climate and the desired look of the roof.

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 roof pitch multiplier also called a roof pitch factor is a number that is multiplied by the area covered by a sloped roof to produce the area of the actual surface of the roof for roof slopes expressed as x in 12 rise in run the roof pitch multiplier is determined by finding the square root of rise run 1. We re going to do a pitch transition or change. The first cut that i make on both the common rafters and the valley rafter is the plumb cut where the rafter will meet the ridge board.

On a related note the pitch properly the slope of a hip or valley rafter will not be the same as the pitch of the adjacent roof sections. I am in the roofing business and for the life of me i cannot figure out how to calculate the compound angle created by one roof meeting another roof. We need to do something where that change happens so the panels can go down and water can come off hit the lower slope and come off the roof. So if your roof is a 45 degree angle that is for every 12 along the horizontal run it rises 12 it s a 12 12 pitch.

While the slope of the common rafters are expressed as x in 12 the slope of the hip and valley rafter on the same roof will be x in 16 97 so where two roof sections intersect to form a 90 angle a regular hip or valley and each roof. Also measure the length of half of the roof from one side of the ridge beam to the edge of the building. This would be handy when we fabricate our valley flashings. Roof valleys are like gutters with a steep pitch but the stakes are higher for valleys than they are for gutters.

Blind valleys simplify framing. If the roof rises 7 inches 18 cm for every 1 foot 0 30 m its pitch would be written as 7 12. If you re using a roofing calculator press the pitch button to input the pitch ratio in the calculator s memory.