Gable Roof Formula

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.

Gable roof formula.

Includes result for hip valley factor slope factor and the roof slope in degrees. Calculating the gable s square footage. To calculate the pitch of a hip valley of a roof the edge has to calculations based on specific points of reference every time. A gable end is the gable and the wall beneath it.

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. Split the gable into two triangles and form a rectangle 6 12 72 the total area for your gable 72 square feet. If you add an eaves overhang dimension then the amount the rafter sticks passed the wall will be added to the rafter length. 12 6 72 convert the inches back to feet.

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. On the tab 3 d view you can better see your future gable roof into a volumetric representation. Calculate the length of a rafter from the roof slope ratio of inches per foot and a building width measurement. That formula is the pythagorean theorem using the following examples.

A gable is the part of the side wall of a building above a line between the eaves. Trusses can be constructed with smaller sized lumber than rafters and often their cost is not significantly higher than normal rafters. It can be looked upon as the part of the wall that seals the end of the roof structure. Waste is calculated at 7 5 for a gable roof and 15 for a hip roof which are typical in the roofing industry.

This distance is the roof s rise. 72 12 6 at the highest point the gable is 6 high. Use of manufactured roof trusses can dramatically cut labor costs when framing a gable roof compared to building rafters. Rise and run means that a 6 12 pitch roof has 6 of rise vertical for each foot of run horizontal.

Pitch measurement method 3. Simplify your calculations and save time the program will draw a plan of rafters a gable roof and displays the results of the calculation of the gable roof for the entered data in the form of a drawing of a gable roof at different angles and its interactive 3d model. 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. Now measure from the 12 inch mark of the level up to the bottom edge of the gable trim.

144 12 12. Multiply this 12 by the roof pitch rise.