How To Figure Rafters On Gable Roof

Subtract this measurement from the width of your building.

How to figure rafters on gable roof. The roof height is the distance from the level of the floor of the attic to the roof ridge. Roof overhang the. Mark the plumb cuts. Marking out the roof rafter lengths onto the timber before cutting step 1.

If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal. Before you can mark the rafter lengths and layout check the. 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.

Includes result for hip valley factor slope factor and the roof slope in degrees. Enter or select the slope of the common rafters. Building width enter the total width of the building. Use the saltbox roof if you want different overhangs for the front and rear roofs.

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. If you re using a 2x4 it ll measure 1 5 inches 3 8 cm. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Overhang enter the horizontal overhang including the thickness of the fascia board.

With the tape measure hooked onto the top end transfer your two rafter lengths onto. Determine the camber along the timbers length. Roof pitch is designated by a set of numbers such as 4 12 or 6 12. Determine the pitch of the roof which is the angle that rafters rise from the outside walls to the ridge.

Measure the width of the ridge beam. The second number is the benchmark for typical pitched roof calculations. 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.

Roof width distance between the points of support of the rafters. Subtract the width of your ridge beam. This is usually the edge of the mauerlat on the external side of the wall. The first number represent the amount in feet that a rafter rises.