2 X 4 Roof Overhang

So the corner is supported by one 2 x4 located usually 2 to 4 ft in from the exterior wall and the rough fascias making for a weak spot you feel when you walk the roof.

2 x 4 roof overhang. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. Erick c 4 23 2017 11 47 00 pm reply. F stands for the beam s fiber strength in bending which depends on the species of wood. Two feet is the general maximum length for a typical roof overhang.

Does it mean to say 4 1 overhang at 12 o c. How can southern pine have less allowable overhang at 12 o c. Joe your problem is at the corner of the roof at the eaves. I m not an engineer but i believe this is due to the added weight of the overhang.

Gable trusses are only dropped over the area of the building not the overhang. That makes absolutely no sense. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof. If the overhang extends beyond 24 inches say to 30 inches then a 2 6 top chord for the tail section will be required to handle the additional overhang.

The vertical rise of the top chord per 12 horizontal inches is the roof pitch or slope. For the initial calculation f can be estimated at 1 000. For example 4 12 pitch means 4 inches of rise in 12 inches of run. Roof overhangs can extend farther than 2 feet but beyond this length they begin to lose structural integrity and require external supports.

The total load is 4 000 pounds. Roof overhangs might look relatively routine but there is a lot of design thinking that goes into creating the optimal dimensions for each one. The table below shows common roof pitches and the equivalent grade degrees and radians for each. They are essential for framing and shading windows reducing splashback and getting rain to fall far enough away from the foundation.

Spacing than if it s 16 o c. L stands for the span of the beam in feet. Now the example formula is 4 000 1 000 bd 2 9 x 10. Most roof s have a pitch in the 4 12 to 9 12 range.