4417 1%2 W Oakfield Ave- DL - Plan

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© 2018 IronRidge, Inc. CA Flush Mount System Certification Letter - 2 1495 Zephyr Avenue Hayward, CA 94544 1-800-227-9523 IronRidge.com The parameters and adjustments allowed in the span tables are defined as the following: 1. The Flush Mount System is designed as a Risk Category II structure as defined by ASCE 7-10 Chart 1.5-1. 2. When designing with a roof slope not listed in the span tables, but no greater than 45°, the lesser of the two span values listed immediately below and above the desired slope shall be used. For instance, if one is designing to a roof slope of 12º, use the lesser of the two span values associated with 10º and 15º. 3. The wind speed selection shall conform to ASCE 7-10 Fig. 26.5-1A (Risk Category II wind) and any state & local county/city amendments to the IBC. No special wind topographic features are included in the span tables and the topographic coefficient (Kzt) is taken as 1.0. 4. The snow load used in the span tables is the ground snow and shall conform to ASCE 7-10 Fig. 7-1. If a more restrictive snow load is imposed by a local building code/amendment to the IBC, such snow load requirement shall also be complied with. If the local jurisdiction specified snow load is in the format of a flat roof snow load, it shall first be converted to a ground snow following the local building code/amendment before the application of the attached span tables. No special snow conditions are considered including unbalanced, drifting, sliding or ponding snow. Snow load conditions presented in the span tables do not include buildings which are intentionally kept below freezing, kept just above freezing, or unheated. 5. The span tables reflect the ASCE 7 prescribed earthquake loads with the maximum magnitudes being: 1) For ground snow no greater than 42psf: S s ≤ 2.0g for Site Class A, B, C, or D. 2) For ground snow greater than 65psf: S s ≤ 1.0g for Site Class A, B, C, or D. 3) For ground snow between 42 and 65psf: Ss ≤ 1.5g for Site Class A, B, C, or D. 6. Roof zone size and definition conforms to ASCE 7-10 Fig. 30.4-2A. 7. Allowable span length in the charts may be multiplied by a factor of 1.08 if the rails are continuous over a minimum of three spans. 8. An array to roof clearance of 2” minimum must be provided. 9. The maximum cantilever length measured from the rail end to the nearest attachment point shall not exceed 40% of the allowable span provided for the respective load & configuration condition from the span tables. 10. No rail splices are allowed in the cantilever, outer 2/3 of end spans, or middle 1/3 of interior spans. 11. For shaded cells of the span tables, UFO Mid Clamps shall not be installed closer than 20” to the shaded cell’s associated Roof Zone. 12. When a roof attachment listed in IronRidge’s Flush Mount installation manual is considered, the span values provided in this letter can be adjusted using IronRidge’s online Design Assistant by checking the capacity of the selected roof attachment against the reaction forces provided in Design Assistant. 4417 1%2 W Oakfield Ave04/12/22