How To Match A Roof Jack Angle To Roof Slope

The value displayed as the rise will be your x.

How to match a roof jack angle to roof slope.

Next select a the pitch the jack rafter is on. To scribe the angle we placed a length of stock on top of the rafter peaks and leveled it across using a scrap block to trace the angle. This is exactly the same ratio as the pitch for the other side but i find it helps to work the two sides separately to avoid confusion especially when it comes to laying out the jack rafters. Determine the minimum slope of the roof based on the roofing material.

Since there are various angles of roofs it is important to use a roofing jack according to the angle or pitch of the roof. This is the adjacent roof that will share the hip or valley. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Standard roofs are around 3 12 to 6 12 pitches.

If you want to find the roof pitch in the form of x 12 simply calculate the pitch and substitute 12 for the run length. Match roof material and use appropriate slope. Of course there are old homes which have an outstanding pitch of around 8 12 and above. If the roof rises 7 inches 18 cm for every 1 foot 0 30 m its pitch would be written as 7 12.

The traditional method has been rise inches 12 run inches. You ll have to find the secondary roof hip pitch the same way you found the main roof hip pitch as in figure 3b. If the roof truss has a 2 4 top chord. If it rises only 6 for every 12 it s a 6 12 pitch.

The top chord smoothly extends out past the wall to create the overhang. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run. For a slope of 4 12 four inches of rise to 12 inches of horizontal run roof jacks are probably not needed. Pitch tan angle where angle is the roof pitch expressed in degrees.

And angles back against the top chord of the truss. It is also necessary to select the pitch of the complimentary roof. If you re using a roofing calculator press the pitch button to input the pitch ratio in the calculator s memory. 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.

If it is not the same it does not matter to this calculator. What angle should a porch roof be. Roof pitch is measured in a rise to run ratio with the vertical rise always shown first. The hip pitch in relation to the secondary roof measures out at 9 5 8 18 13 16.

Where the porch roof extended over the shed roof we installed a 2x6 ridge that ran from the top of the dropped structural ridge to the apex of the sleepers. With the roof pitch the same. Walking on a roof with a pitch of 5 12 or 6 12 is possible but it is still a good idea to place a row of roof jacks along the bottom edge of the roof. Most roof jacks depend on angles.

Roof slope calculator example of use. Certain roof slopes are safe enough to walk on without using roof jacks.