Fenestration Canada Points Out Practicality in NAFS

October 14th, 2014 by Editor

What are building codes if not practical?

In a recently-held Fenestration Canada webinar, Education Committee Chairman J.F. Kogovsek talked about the practicality of code applications and requirements.

First discussed was how windows, doors and skylights must be designed, constructed and installed according to the National Building Code 2010. For all practical purposes, said fenestration must resist the ingress of precipitation, wind and slow load, forced entry, insects and vermin and control air leakage and be easily operable.

Kogovsek went on to explain how the North American Fenestration Standard (NAFS) differs from CSA A440 and how NAFS is more practical all-around.

  • CSA was only for windows where as NAFS is for windows, doors and skylights.
  • CSA’s performance ratings were listed as A’s, B’s, and C’s.

“Air infiltration, exfiltration, water penetration resistance, and design pressure—positive and negative—these are what replace the A, B, and C’s,” said Kogovsek. He also explained how NAFS has different representation of the ratings, namely 1 – performance class, 2 – performance grade, 3 – size tested and 4 – Optional product type designation.

  • CSA size tested covered more than 25 percent greater in width and height.

“NAFS only covers the maximum size tested and everything under is covered. Everything over is not. That’s a big difference,” Kogovsek said.

  • CSA testing requirements were limited to structural where as NAFS includes air and water guidelines as well.
  • CSA was a stand-alone document where as NAFS works in conjunction with its Canadian supplement.
  • CSA labeling requirements include performance but no size. NAFS requires the size tested.

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