How To Figure Rafters On Gable Roof

Subtract the width of your ridge beam.

How to figure rafters on gable roof.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Calculate the length of common rafters with this free and easy online tool by entering a dimension for the roof width selecting a pitch for the roof and the thickness of the ridge. Includes result for hip valley factor slope factor and the roof slope in degrees. Required for calculating rafter dimensions.

Mark the plumb cuts. Determine the camber along the timbers length. The second number is the benchmark for typical pitched roof calculations. Subtract this measurement from the width of your building.

The first number represent the amount in feet that a rafter rises. Roof width distance between the points of support of the rafters. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. The ridge beam is the vertical piece of plywood which will form the peak of the gable and to which you ll fasten the rafters on either sides.

After they re up you can snap a line to mark and trim the tails in a nice straight line to make up for any ridge warp or marking cutting and fixing errors. This is usually the edge of the mauerlat on the external side of the wall. Determine the pitch of the roof which is the angle that rafters rise from the outside walls to the ridge. Roof overhang the.

Roof pitch is designated by a set of numbers such as 4 12 or 6 12. The results are automatically fired. Gable roof framing calculator plan diagram with full dimensions for a good straight fascia add an extra inch or 2 to the tails of all your rafters total length. Enter or select the slope of the common rafters.

Our roof rafter calculator tools are handy for calculating the number of rafters needed rafter length calculator lineal feet of rafter board feed in ridge and sub facia and the total board feet in the roof. If you re using a 2x4 it ll measure 1 5 inches 3 8 cm. Before you can mark the rafter lengths and layout check the. Use the saltbox roof if you want different overhangs for the front and rear roofs.

Measure the width of the ridge beam. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Building width enter the total width of the building. The roof height is the distance from the level of the floor of the attic to the roof ridge.