7.4.1-7.4.4 and ASCE Figure 7-2 below. It makes sense when designing a metal roof to shed snow, not to keep it on. It is critical that a designer specify enough snow retention devices based on the slope and snow load. ASCE 7-10 Snow Load Provision SEAoO Conference September 2011 Michael O’Rourke PE , Ph.D. Rensselaer Objectives Introduce changes in the ASCE 7-10 Snow Load provisions Present reasoning behind changes Answer Frequently Asked Questions Answer audience questions (hopefully) 2 Outline Minimum Roof Snow Load Thermal Factor Unbalanced Load The structural supports of roofs and marquees shall be designed to resist wind and, where applicable, snow and earthquake loads, in addition to the dead load of construction and the appropriate live loads as prescribed in this section, or as set forth in Table 1607.1. The National Building Code suggests a linear reduction from the applicable basic snow roof load, with full load at 30 degrees reducing to "zero" load at 70-degree slope. If you live in a climate with cold winters and numerous snow storms, a pitched roof will prevent the snow from remaining on the top of your home. For locations where 0 pg = 20 psf, all roofs with a slope W/50 (with W in ft.) shall have a 5 psf rain-on-snow surcharge.
Sloped Roof Snow Loads, I s When the roof slope is greater than 5°, the roof is considered sloped. 7-2b with a C s =1.0 p f = Flat Roof Snow Load in psf With expansion and contraction of the metal, it is difficult to attach snow retention devices into the roof decking without causing a roof leak or slotting of the metal panel from the snow bracket fastener. S = Design Snow Load in pounds per square foot (psf) Minimum Snow Load is 40 psf For lower roofs subject to sliding snow from sloped roofs above, the design load shall be determined from the formula ASCE 7-02, Section 7.9, published by the American Society of Civil Engineers. This rain-on-snow augmented design load applies only to the balanced load case and need not be used in combination with drift, sliding, unbalanced, or partial loads. Actually, with snow, you don’t get more load along the slope of the rafter; you get the same load as a flat roof with the same run would get. In ASCE7-05 it seems the sloped roof snow load is the same as the flat roof snow load except for a few extreme roof slopes no reduction for the typical 6:12.
Rs = Snow load reduction in psf per degree of slope over 20 degrees. IBC 2012: 1607.12 Roof loads. Snow Loads for Structural Design in Montana (Revised 2004) Gregory P. Theisen Michael J. Keller Jerry E. Stephens ... Sloped Roof Snow Load (Warm Roof) ... Fred F. Videon and James P. Schilke titled Snow Loads for Structural Design in Montana. The sloped roof snow load, p s, is found by multiplying the flat roof snow load, p f, by a slope factor, C s. The value of C s depends on such factors as The slope of the roof. Residential roof with asphalt, wood shingles or shakes would use Fig. Since its
The steeper the pitch, the better the snow will fall to the ground.
The sloped roof snow load, p s, shall be obtained by multiplying the flat roof snow load, p f, by the roof slope factor, C s: p s = C s p f The thermal factor, C t , from Table E-3 determines if a roof is “cold” or “warm.” “Slippery surface” values shall be used only where the roof’s surface is unobstructed and sufficient space is available below the eaves to accept all the sliding snow. This is because as snow falls vertically it spreads itself further along a sloping rafter and so accumulates less depth. Sloped roof snow loads are assumed to be acting on the horizontal projection of the surface. If the address matches an existing account you will receive an email with instructions to reset your password.
Calculate sloped roof snow load p s using the following equation: p s = C s p f where: p s = Sloped Roof Snow Load in psf C s = Roof Slope Factor, as determined by ASCE Sec. The sloped roof snow load is calculated using equation 7.4-1: Even though sloped roofs benefit from reduced snow loads, snow sliding from such roofs onto a lower roof may greatly increase the load on the lower roof.
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