Need help with framing angles for roof

that would lower the pitch
and in northern virginia
with snow loads
that may not be so good

i have mine made by licensed truss engineers

i’ve made them
but found it is cheaper
to go with buying them
they got all the teck on that
and they all pass codes

-- david - only thru kindness can this world be whole . If we don't succeed we run the risk of failure. Dan Quayle

What type of roof framing configuration do you currently have? Are you using a “shed” roof configuration or do you have a ridge board down the center of the building? A “shed” roof configuration is a building with a single pitch from one side to the other.

-- Darrell, making more sawdust than I know what to do with

-- You can't control the wind, but you can trim your sails

A book titled Full Length Roof Framer by A. F. Riechers could be very useful if you want to go the DYI route.

-- Darrell, making more sawdust than I know what to do with

What kind of room is on your shed? I use a framing square to figure roof angles.

-- CJIII Future cabinetmaker

I’ve also had good luck with using the little nuts that screw down on the framing square. Just align the nuts so that the edge of the board hits 12” on one side and 16” on the other. Then the square will give you your plumb cuts.

-- You can't control the wind, but you can trim your sails

First some terms: a ceiling joist is a horizontal board from one outside wall to the other. A rafter is a board from the outside wall to the peak of the roof (ridge). If it’s a gable roof, there will be a rafter on each side and they join at the ridge. A ridge board runs horizontally between and perpendicular to the rafters.

The slope of the roof is the amount of rise relative to the horizontal distance from the outside wall. This is usually indicated by the number of inches rise per 12” of run. This can also be feet of rise per feet of run. A 4/12 roof rises 4” for every 12” of run or 4 feet for every 12 feet of run.

If you have access to the joists and rafters of the existing roof, measure from the outside of the outside wall top plate to the center of the joist. Now measure from the bottom of the joist to the bottom of the rafter where it meets the ridge board. Because your building is 12’ wide, the center of the joist should be at 6’.

Your run is 6’ and your rise is ??. If your rise measures 2’, multiply x 2 (12/6=2) and you have a slope of 4/12.

Now, you can google how to cut a rafter using a speed square or framing square. The brass clamp on thingies to usse with the framing square are called stair guages and are less than $5/pr.

-- Please Pray for Our Troops / Semper Fi / Bob Ross / www.theborkstore.com