About this item
The Cal-Royal CR270472 hits both requirements correctly: 1/2" height keeps it at the ADA maximum for handicap-accessible barrier-free applications, and the 4" width covers the standard door sill for residential and commercial openings. At 72" (6 feet), it fits double-door openings and wider single-door commercial applications without splicing. It's heavy-duty aluminum, fire tested to 3-hour positive pressure, certified to UL 10B and UL 10C, and it comes with fasteners included.
The CR270472 is part of the Cal-Royal CR2704 Series, the 4"-wide saddle threshold line available in multiple lengths and two standard finishes. For all threshold, weatherstripping, and door hardware accessories, browse our full builders hardware catalog.
Why 1/2" Height Matters for ADA and Fire Code
ADA guidelines specify that an exterior door threshold cannot exceed 3/4" height, and interior thresholds cannot exceed 1/2" height. For thresholds between 1/4" and 1/2" high, the ADA also requires a beveled surface at a slope no steeper than 1:2 on each side. The saddle profile of the CR270472 provides that beveled transition on both faces, making it compliant for wheelchair access and barrier-free applications over carpet.
The 3-hour positive pressure fire rating is the more technically demanding requirement. UL 10C positive pressure testing simulates actual fire conditions where rising pressure from a fire causes smoke and gases to push against the door from the fireside. The CR270472 has been tested and listed to maintain the door's fire rating under positive pressure conditions, which is what NFPA 80 and most AHJs require for fire door assemblies. UL 10B certification covers the non-positive pressure fire test for completeness of the fire listing.
Cal-Royal CR270472 Technical Specifications
Series: Cal-Royal CR2704. Height: 1/2" (12.7mm). Width: 4" (101.6mm). Length: 72" (1828.8mm). Material: Heavy duty aluminum. Profile: Commercial saddle (beveled both sides). Fasteners: #10 x 1-1/2" wood screws, included. ADA: Handicap accessible, barrier free over carpet. Fire rating: 3-hour positive pressure. UL certifications: Meets UL 10B and UL 10C. Code compliance: Meets UBC 7-2 (1997). Grade: Heavy duty. Finishes: Mill Aluminum and Dark Bronze. Optional: Sure Step Non-Slip Abrasive Coating available. Can be field cut to shorter lengths.
CR2704 Series Length Options
The CR2704 4"-wide saddle threshold is available in four standard lengths. CR270436 is the 36" version for standard 3' single doors. CR270448 covers 48" openings for oversized single doors. CR270472 (this product) covers 72" for double door openings or wider commercial applications. CR270496 covers 96" for the widest commercial double door openings. All four lengths share the same profile, finishes, fasteners, and certifications. If your door width falls between sizes, the threshold can be field cut to the exact length needed with standard aluminum cutting tools.
Finish Options and Sure Step Coating
Mill Aluminum is the standard architectural aluminum finish, compatible with most aluminum storefront systems, hollow metal frames, and light commercial door installations. Dark Bronze provides a warmer tone that coordinates with bronze anodized aluminum frames, oil-rubbed bronze hardware finishes, and traditional institutional architecture. The Sure Step Non-Slip Abrasive Coating option adds a textured surface to the threshold walking surface, which reduces slip risk in high-traffic or wet-floor conditions. If your application is in a building entrance, hospital corridor, or exterior vestibule where wet conditions are regular, specify Sure Step at time of order.
Applications
The CR270472 is specified for wood and hollow metal door frames in commercial and institutional buildings including schools, hospitals, office buildings, government facilities, and retail spaces. It provides protection against drafts, moisture, dust, and insects at the door sill while maintaining ADA barrier-free accessibility and fire rating compliance.
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