explanation
What does a NAFS performance grade on a window label mean
A NAFS performance grade combines the performance class with a design pressure rating and a tested size.
Technical reference
Research hub
Homeowner Process Guides
Process guides cover the procedural side of a replacement project: due diligence, documentation, approvals and inspection.
References in this hub(2)
Guides
How to Verify a Window Contractor's License in California
California requires a licensed contractor for window replacement work over $500. Verification takes two minutes through the Contractors State License Board and should include license status, classification, bond and workers compensation coverage.
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