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i <br />I dense R ROOF WINDOWS <br />ll *ection 07812 <br />I <br />I E. National Wood Window & Door Association (NWWDA): <br />1. NWWDA Industry Standard I.S. 4 -Bl, Industry Standard for Water -Repellent Preservative Treatment for Millwork. <br />I 2. NWWDA Industry Standard 1.5.7-67, Industry Standard for Wood Skylight F Roof Window Units. <br />1.04 PERFORMANCE REQUIREMENTS <br />A. Roof windows to comply with the minimum performance requirements specified in NWWDA industry Standard I.S. 7, except <br />where more stringent requirements are specified. <br />1. Slationaryhoof Windows: Grade 60. <br />2. Ventilating Roof Windows: Grade 40. <br />THE AIR INFILTRATION VALUES SPECIFIED BELOW ARE FOR ANDERSEN ROOF WINDOWS, THE <br />VALUES LISTED ARE MORE STRINGENT THAN THE MAXIMUM AIR INFILTRATION ALLOWABLE FOR <br />NWWDA GRADE 60 WINDOWS (STATIONARY ROOF- WINDOW) AND NWWDA GRADE 40 WINDOWS <br />(VENTILATING ROOF WINDOW), NWWDA GRADE 60 WINDOWS ALLOW A MAXIMUM AIR <br />INFILTRATION OF 0.10 CFM(LF OF PERIMETER CRACK AND NWWDA GRADE 40 WINDOWS ALLOW <br />A MAXIMUM AIR INFILTRATION OF 0.25 CFM/LF OF PERIMETER CRACK <br />B. Air Infiltration; Average total air infiltration per linear foot of perimeter crack at a static pressure of 157 psi when tested in <br />accordance with ASTM E 243 shall be as follows: <br />1. Stationary and Venting Roof Windows: 0.03 CFWLF. <br />C. Water Penetration: No water penetration beyond the Interior lace of window unit when tested in accordance with ASTM E 547 <br />at the following slatic pressures:. <br />1. Stationary Roof Windows: 6,24 psf. <br />2. Ventilating Roof Windows: 4.43 psi. <br />D. Structural Performance: No glass breakage, damage to hardware, or permanent deformallon (set) which would cause any <br />malfunction or Impair the operation of the unit, or residual deflection greater than 0.4% of span when tested in accordance Will <br />ASTM E 330 a1 a lost pressure of 60 psi for stationary roof windows and 40 psi for ventilating fool windows. <br />NOTE: CONTACT ANDERSEN DISTRIBUTOR WHERE= DESIGN LOAD EXCEEDS 40 PSF FOR <br />STATIONARY ROOF WINDOWS OR 26.6 PSF FOR VENTILATING ROOF WINDOWS. <br />E. Design Criteria: Design and size window components to withstand loads Imposed by wind to a pressure o1 ] j lbs/sq it <br />when measured in accordance with ASTM E 330. Limit deflection to 0175. <br />F. Thermal Performance: Window units shall demonstrate maximum U -values when calculated using LBL WINDOW 3.1 as <br />follows: <br />1. Stationary Roof Windows: <br />t a. ]Standard Residential Unit (3' x 4'): 4.42.] <br />b. (Standard Commercial Unit (4'x 6'): 0.39.) <br />t_ 1. Ventilating Hoof Windows: <br />a, (Standard Residential Unit (3'x 4'): 0.47.1 <br />r <br />y b. (Standard Commercial Unit (4'x 6'): 0.43.1 <br />07912-2 <br />