What is standard roof load?
Table of Contents
What is standard roof load?
The dead load of a typical asphalt-shingled, wood-framed roof is about 15 pounds per square foot. The load increases with the use of heavier roofing material. A clay-tiled roof may have a dead load of as much as 27 psf.
How much weight will a roof hold?
While the average roof can withstand 20 pounds per square foot, there’s a huge range in the weight of snow: Fresh, light snow can weigh just 3 pounds per square foot… so your roof may be able to hold over 6 feet of it. Wet, heavy snow can weigh 21 pounds per square foot… so a foot of it could risk collapse.
What is roof load?
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. This downward imposed load on the home is also known as the snow load.
How much does a roof weight per square foot?
Table of Roofing Material Weights
| Weight of Roofing Materials | ||
|---|---|---|
| Roofing Material | Pounds per Square Foot (lb/ft2) | Pounds per Square (100 Sq. Ft.) |
| Asphalt Shingles “3-Tab” or “Strip” | 1.95 lbs | 195 lbs |
| Asphalt Shingles “Architectural”, “Dimensional”, or “Laminate” | 3.05 lbs | 305 lbs |
| Asphalt Shingles “Luxury” | 4.25 lbs | 425 lbs |
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.
How much does roofing weight per square?
On average, one square of shingles typically weighs 150 to 240 lbs. The thickest and most dense roofing shingles may weigh 320 to 400 lbs per square.