Specification desk

Contact Cornerstone Building Brands

Reach fenestration and cladding engineers for U-factor packages, coastal approval pathways, installation sequencing, and warranty claim routing. Include climate zone, design pressure targets, cladding substrate, and whether the inquiry concerns new construction or renovation so we can route your note within one business day. For ENERGY STAR Partner qualifications, attach the energy model summary or the NFRC label targets your jurisdiction expects. If you are comparing engineered cladding against natural fiber-cement or wood-look alternatives, note aesthetic constraints alongside water absorption and impact resistance requirements so the response package addresses both performance and finish decisions.

Headquarters address

Cornerstone Building Brands Technical Center
5020 Weston Parkway, Suite 400
Cary, NC 27513, USA

Business hours

Monday–Friday
08:00–17:30 Eastern Time
Warranty claim desk available for registered products

Map illustration of Cornerstone technical center

Visit / ship samples

Ship substrate coupons, cladding samples, or mock-up sash sections to the technical center receiving dock. Label packages with project name, target U-factor or design pressure, cladding type, and whether the assembly must meet ENERGY STAR or coastal approval thresholds. Coupons should be large enough for air leakage and water penetration specimens; painted or laminated finishes should arrive with batch certificates when available.

For renovation programs, note existing opening sizes, rough opening condition, and whether interior finishes must remain undisturbed. For multifamily schedules, mark unit count and whether punched openings share a common cladding plane—those paths often need coordinated flashing details across elevations.

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  • Sample dock hours: Mon–Thu 08:00–16:00 ET

Send a technical inquiry

Use this form for full data packages—not the compact modal used on product cards. Include jurisdiction, assembly type, and whether you need comparative thermal tables, installation sequencing, or warranty claim status routing for faster response.