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What IECC 2021 Actually Requires for Windows — and How Aluminum Systems Deliver Energy code compliance is no longer a checkbox exercise. As more states adopt or enforce the 2021 International Energy Conservation Code (IECC), architects, contractors, and builders face stricter fenestration performance thresholds than any previous edition. For those specifying aluminum windows, the question is direct: can aluminum meet the code?...

Why Every Project Manager Needs to Understand the NFRC Label When you're specifying windows and doors for a commercial or multi-family project, the fenestration product data sheet can run several pages. But one piece of information cuts through the noise faster than any marketing brochure: the NFRC label. Administered by the National Fenestration Rating Council (NFRC), this standardized energy performance label gives...

Why U-Factor Is the Most Critical Metric for Aluminum Window Specification When architects, builders, and contractors specify windows for a new construction or retrofit project, no single performance number carries more regulatory and energy consequence than U-factor. Unlike visible light transmittance or air leakage ratings, U-factor directly determines whether your fenestration assembly passes prescriptive energy code—or triggers a costly performance-path compliance review....