Pre-Engineered Design Load Data / Specifications
1. Structural members, glazing material and connections shall be designed, fabricated and installed in accordance with the local building code, ASCE 7-95 (section 2.4) and are pre-engineered to support the following structural loads:
a. Self-supporting load of 10 pounds per square foot.
b. Maximum Ground Snow Load of 50 pounds per square foot.
c. Minimum Live Load of 20 pounds per square foot.
d. Wind loads resulting from a 120MPH, 3-second gust speed with pressure determined by ASCE 7-95 "Minimum Design Loads for Buildings and other Structures."
2. The deflection on any structural member in the plane normal to glass surface when subjected to the specified loads shall not exceed L/175 of its clear span. Deflection within the length of any individual glass panel shall not exceed ¾".
3. Parallel to glazing plane deflection of a framing member when carrying full design load shall not exceed an amount reducing the glazing unit below 75% of the design dimension and shall not reduce the edge clearance to less than 1/8" nor shall it damage or impair the function of any joint seal.
4. Provides for expansion and contraction of components resulting from an ambient temperature change of 180 degrees F (+/- 90 degrees F) without causing buckling, excessive stresses on glazing, structural elements or fasteners, failure of seals, reduction of performance or other detrimental effects.
5. No water penetration shall occur when system is tested in accordance with ASTM E 331 using a differential static air pressure of 20% of inward acting (positive) design wind load, but not less than 10psf. Water penetration is defined as the appearance of uncontrolled water other than condensation occurring on the interior surface of any part of the skylight.
6. Air infiltration shall be limited to not more than 0.03cfm. Per square foot of assembly when tested in accordance with ASTM E 283 at 6.24psf. static air pressure difference.
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