Plain-English Spec Breakdown for Glass & Aluminium Works

What a good one includes

• A clear, itemized list of all windows, doors, curtain walls, and framing systems required, mapped directly to the architectural drawings.
• Highlighted performance requirements including specific U-values, SHGC ratings, acoustic targets, and wind load capacities.
• A detailed breakdown of the exact glass types, thicknesses, and treatments specified, such as toughened, laminated, or low-emissivity glass.
• A dedicated warning section identifying high-risk clauses like structural deflection limits, tricky structural connections, or strict sequencing requirements.
• A summary of the mandatory testing, quality assurance checks, and warranties you must provide upon completion.
• A list of items typically assumed to be your job but explicitly excluded or left ambiguous in the paperwork, like structural steel supports or perimeter sealants.

Common mistakes to avoid

• Overlooking specific thermal performance or acoustic ratings and quoting standard commercial frames that cannot physically meet those energy targets.
• Missing hidden wind load or structural deflection criteria buried deep within the structural engineer's notes rather than the window schedule.
• Failing to identify compliance requirements for safety glass in critical impact zones, leading to expensive retrofits after the building inspector's review.
• Ignoring strict finish specifications, like marine-grade anodizing or specific powder-coating warranties, which drastically alter material procurement costs.

Frequently asked questions