What is the minimum required roof design load?
What is the minimum required roof design load?
Roofs used for promenade purposes shall be designed for a minimum live load of 60 psf (2.87 kN/m2). Roofs used for roof gardens or assembly purposes shall be designed for a minimum live load of 100 psf (4.79 kN/m2).
What Is roof snow load in PA?
Most central Pennsylvania roofs, if built correctly, should withstand a snow load of at least 12-14 inches, said Michelle Benoit, professional engineer from BE Structural PC, Lemoyne. “We’re in that borderline range,” Benoit said, adding that repeated melting and refreezing makes the load heavier.
What is roof design load?
This is why roofs should be designed to support their own weight. Roof loads are measured by pounds per square foot. The dead load of asphalt shingle roofs with wooden frames is usually 15 pounds per square foot (psf). Heavier residential roofing materials such as clay and slate have dead loads that reach up to 27 psf.
How do you calculate the load on a roof truss?
Multiply the Span by the Height to calculate the area: 24ft x 4ft = 96 sq-ft. area. Multiply that by the weight of our material (2psf), and we get a total weight of 192 lbs. This is the total weight of all the material to be added to the face of the truss.
What is roof load design?
Roof load (live load) design is affected by the shape of the roof whether it is flat, curved or pitched. Roof loads are a downward (vertical) force on the home. The North Zone, Middle Zone and the South Zone are identified on the roof load zone map above.
What is the weight of a live load on a roof?
Roof loads are measured by pounds per square foot. The dead load of asphalt shingle roofs with wooden frames is usually 15 pounds per square foot (psf). Heavier residential roofing materials such as clay and slate have dead loads that reach up to 27 psf. The weight of temporary objects on the roof is referred to as the live load.
What is a roof’s dead load?
Heavier residential roofing materials such as clay and slate have dead loads that reach up to 27 psf. The weight of temporary objects on the roof is referred to as the live load. Live loads include the roofing crew and the equipment and tools they bring with them. A roof must be able to support both its dead load and live load at any given time.
What is the uplift load on a roof?
Uplift Load Basically, when a breeze hits the exterior of a building, the wind disperses pressure along the wall. When this happens, the wind also exerts an upward force on the roof which the roof must then be able to resist. Most of the uplift load can be stabilized by the dead load of the roof.