Gable Roof Formula

To calculate the pitch of a hip valley of a roof the edge has to calculations based on specific points of reference every time.

Gable roof formula.

Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. 72 12 6 at the highest point the gable is 6 high. Now measure from the 12 inch mark of the level up to the bottom edge of the gable trim.

This distance is the roof s rise. When a gable consists of a sloping roof rather than a flat one the gable forms a triangle. A gable end is the gable and the wall beneath it. 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.

Pitch measurement method 3. The edge uses plan view to calculate measurements and to apply a specific formula to its measurements. Multiply this 12 by the roof pitch rise. Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry.

Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. A gable is the part of the side wall of a building above a line between the eaves. Note that in the last 3 4 years costs of roof shingles and many accessories have gone down by an average of 18 20 currently the us national average for benchmark architectural shingles is around 74 51 square or 25 per bundle. On a ladder at the gable end of your house place the level against the gable trim flat against the side of the house.

Calculating the gable s square footage. 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. On the tab 3 d view you can better see your future gable roof into a volumetric representation. That formula is the pythagorean theorem using the following examples.

It can be looked upon as the part of the wall that seals the end of the roof structure. 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. 12 6 72 convert the inches back to feet. 144 12 12.

Split the gable into two triangles and form a rectangle 6 12 72 the total area for your gable 72 square feet. Includes result for hip valley factor slope factor and the roof slope in degrees.