Non-shaded (CS) areas require site-specific Case Studies to establish ground snow loads. For C t = 1.0 and I s = 1.0, Equation 7-1 produces ground-to-roof snow Building Classification : Table 1-1, page 3: Ground Snow Load, pg: psf: Figure 7-1, pages 84-85 and Table 7-1, page 92: Length of High Roof, Lu: ft. Where flat roof snow loads exceed 30 psf (1.44 kN/m 2), 20 percent shall be combined with seismic loads. C t is Thermal factor. Warm roofs lose heat in such a way that it melts snow, while cold roofs lose heat that doesn’t contribute to melting. I would agree with you if we use ASCE 7-05, which requires unbalanced snow on leeward side of the gable regardless of roof pitch. This program specifically follows Section 7.0, Snow Loads, of the ASCE 7-10 Standard, "Minimum Design Loads for Buildings and Other Structures". While this may be more intuitive for flat or even gable/hip type roofs, the determination of snow loads is increasingly more difficult for arch roofs due to complex geometry. Pg = ground snow load Pf = flat roof snow load = Pg*I*Ce*Ct Ps = sloped roof snow load = Pf*Cs The "minimum" Pf is defined in ASCE-7-98 as: I*Pg when Pg is less than or equal to 20psf I*20 when Pg is greater than 20psf +++++ The "minimum" that is specified is for cases when the Ce*Ct<1.00. The ASCE 7-16 standard requires both balanced and unbalanced snow load case scenarios for a structure's design consideration. Like its predecessors that accompanied earlier versions of ASCE 7, this new edition of Snow Loads discusses flat roof loads, sloped roof loads, partial loads, and all types of conventional drift loading. for Balanced Snow, Drift, and Rain-on-Snow Surcharge Loadings . If slope ≤ ¼” in 12”, design to prevent ponding. The first is a simple, one story hip roof. 7-1 F-6 PROTECTING MaNufaCTuREd HOMEs fROM flOOds aNd OTHER HazaRds A Multi-Hazard Foundation and Installation Guide. I = importance factor. ASCE 7 Table 7-3 Calculate flat roof snow load pf 0.7CeCt Is pg no Is roof flat? This document provides for all roof snow loads to be calculated from ground snow loads, however not every Building Department follows this procedure. р f = design flat roof snow load. Specifically, coefficients and related and required parameters are selected or calculated in order to compute the net design snow loads, including snow drift due on lower roofs and rain-on-snow surcharge. Specifically, coefficients and related and required parameters are selected or calculated in order to compute the net design snow loads, including snow drift due on lower roofs and rain-on-snow surcharge. "ASCE705S" --- ASCE 7-05 CODE SNOW LOAD ANALYSIS PROGRAM "ASCE705S" is a spreadsheet program written in MS-Excel for the purpose of flat roof snow loading analysis for buildings and structures per the ASCE 7-05 Code. or 1 in./ft.) (Note: for reference, a 1:12 roof slope equates to 4.76 degrees, and the program allows a slope up to 1.05:12.) Most residential structures are situated in a B or C terrain category and are partially exposed with a C e =1.0 C t = Thermal Factor, as determined by ASCE Table 7-3 below. р g = ground snow load. Exposure factor, C e: Exposure factor, C e is based on wind exposure of structure. Allows up to 10 different flat roof snow loads to be calculated by entering values for all of the parameters in accordance with ASCE 7. Driven by recent changes to the ASCE 7 snow load provisions, this guide describes: Flat roof snow loads of 30 psf (1.44 kN/m 2) or less and roof live loads of 30 psf (1.44 kN/m 2) or less need not be combined with seismic loads. 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