Volume 13, Issue 2 - March 2012

AAMA Analysis

Storm Product Standards
Catching Up to 21st Century Energy Efficiency Demand

by Ken Brenden
kbrenden@aamanet.org

Storm doors and windows are receiving interest and have garnered growing awareness from the Department of Energy and manufacturers alike. Accordingly, they have been included in the scope of the latest edition of the North American Fenestration Standard, NAFS-11 (AAMA/WDMA/CSA 101/ I.S.2/A440-2011).

To define the performance of these products, the specifications, AAMA 1002-11, Voluntary Specification for Secondary Storm Products for Windows and Sliding Glass Doors, and AAMA 1102-11, Voluntary Specification for Side-Hinged Secondary Storm Doors—previously dating to 1993 and 1989, respectively—cover what was formerly known as “combination” or “insulating” storm products but are now referred to as “secondary storm products” (SSP). They interlock with NAFS by virtue of being added as operator types to the new omnibus standard and by referencing NAFS-11 within them.

General Performance Requirements
NAFS requires structural, air infiltration and water penetration testing for AAMA 1002 compliance of SSPs and structural and water testing for side-hinged storm doors (AAMA 1102 products). These requirements are slightly different from those in NAFS applicable to prime doors and windows. For example, while structural (windload) testing is the same as for prime windows and sliding doors at 150 percent of the applicable design pressure, SSP water testing (for adequate drainage) is conducted at 10 percent of design pressure (versus 15 or 20 percent for prime windows) for design pressures of 20 psf or more. For design pressures less than 20 psf, the water test pressure is zero. Air leakage test pressure for storm windows is the same at all performance levels: 1.57 psf.

"In addition to those imposed in NAFS, product-specific requirements for both internally and externally applied fixed, and horizontally or vertically operable storm windows and sliding doors are detailed in AAMA 1002."

SSP materials (structural members, fasteners, hardware, weatherstrip, sealants, gaskets, coatings/finishes, insect screens and glazing) are the same as those for prime doors and windows specified in NAFS.

Product-Specific Requirements
In addition to those imposed in NAFS, product-specific requirements for both internally and externally applied fixed, and horizontally or vertically operable storm windows and sliding doors are detailed in AAMA 1002. These include operating force requirements and, for vertically operating products, safety drop testing for units with or without pre-set sash retention positions.

Another SSP-specific requirement is a sash/leaf concentrated load test on the latch rail. A concentrated load of no less than 15 lbf (pound force) is applied to the center of the span of the latch rail, both perpendicular (normal) to, and then in the plane of, the sash or leaf. It is first pulled in one direction and then in the opposite direction, which cannot cause glass breakage, deglazing or frame deflection greater than 0.06 inch in order to pass testing.

For AAMA 1102-compliant storm doors with an integral vertically operating sash, AAMA 1002 requirements for the vertically operating storm window sash drop safety stop test apply. Requirements are also set forth for louver hardware in jalousie storm doors.

Storm doors are further required under AAMA 1102 to pass racking and sag tests under applied loads of 30 to 40 lbf to determine permanent deflection of the bottom member, not to exceed 0.25 inch for racking or 0.063 inch in sag.

Products governed by AAMA 1002 and 1102 (and thus also by NAFS), may be certified and labeled under the AAMA Certification Program.

For a copy of AAMA 1002-11 or AAMA 1102-11, visit the AAMA online Publication Store at www.aamanet.org/store.

Ken Brenden serves as technical services manager for the American Architectural Man-ufacturers Association in Schaumburg, Ill.



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