- Tackling NAFS: Proposed Plans for Simplification
June 16, 2017
Tackling NAFS: Proposed Plans for Simplification
Leading off with the observation that “we’ve created a monster” in NAFS, with its 190 pages, more than 170 referenced primary standards and 36 different product types, Joe Hayden (Pella) reported on the efforts of the NAFS Strategy Task Force to simplify the standard. Initial objectives were to reduce the number of performance classes, focus on air/water/structural (AWS) performance and move material and component requirements to a separate document that can be referenced.
The revised North American Fenestration Standard (NAFS-17), targeted for “incremental improvements,” will be published by December of this year to be adopted for reference in the 2018 codes.
Hayden noted that NAFS-17, the third ballot of which closed last November, includes several significant changes vs. NAFS-11:
- Exclude air/water requirements for side hinged entry door (SHED) lock/latch hardware
- Harmonize U.S. and Canadian operating forces
- Add folding doors as a new product type
- Require warning labels on all window screens
- Establish mullion tributary width and mulled assemblies
- Determine proper specimen mounting in a test buck
- Clarify window opening control device (WOCD) provisions
Categorization of clauses to be included in NAFS-17 is seen as the first step toward simplification. Material would be reorganized under five categories:
- HS (health and safety)
- DL (durability and longevity)
- CPM (component parts and materials)
- COM (commentary)
Once all balloting is resolved through the Joint Document Management Group (JDMG) and Canadian Standards Association (CSA) editorial staff, NAFS-17 would be published and submitted to the ICC for referencing in the 2018 codes.
Expected to be the full simplification version, NAFS-19, would have to be published by June of 2019 to be referenced in both the 2020 Canadian code and the 2021 I-Codes. (The first draft of this document is currently being balloted to AAMA membership.) For NAFS-19, no consensus could be reached on the initial objective of reducing the number of performance classes, so the current four-class regime (R, LC, CW and AW) will remain. However, minimum gateway test sizes are proposed to be eliminated for R and LC classes, substituting the provision that a licensee can test the largest size they wish to qualify, with anything larger not qualifying. Also proposed, performance grade caps (100 psf) would be eliminated from R, LC and CW classes (there already is no cap for AW products).
The U.S. and Canadian water test pressure would be harmonized at 15 psf, which would increase pressures for R, LC and CW products at a performance grade of 85 and above (65 and above for AW).
Allowable operating force would be simplified by eliminating the separate limits for “initiate” and “maintain,” relying instead on a single limit for the entire range of motion based on the current “initiate” limits.
Certain material and component requirements that rely on other standards would be reduced to non-mandatory design guidance. These would be:
- Safety glazing (ANSI Z97.1)
- WOCDs (ASTM F2090 and F2006)
- Hardware per applicable AAMA specs
- Weather seals per applicable AAA specs
- Sealants (AAMA 800)
- Setting blocks per IGMA specs
- Integral ventilation devices