Steel Welded & Knockdown Door Frames for NYC Buildings
Capitol Fireproof Door manufactures custom welded steel frames and knockdown hollow metal door frames for commercial, industrial, and multifamily buildings throughout New York City and Long Island.
Our steel frames are available in standard and custom sizes, with hardware reinforcements, masonry and drywall anchors, and configurations designed to accommodate project specifications.
From new construction to replacement openings in older NYC buildings, we provide custom frame solutions designed for proper door fit, installation, and operation.
Available in standard & custom sizes
Trims and jamb widths are available to fit every situation
borrowed lights & trimmed openings are available
Angle spreaders are welded to the bottoms of masonry frames to assure safe shipment and perfect alignment, ready for setting in the field
Steel welded frames available in 12, 14, 16, 18 gauge, prime quality, cold-rolled steel
steel welded frames can be manufactured with attached sidelights and/or fixed transoms
Masonry, stud, and Z clip anchors are available
A minimum of 3 anchors per frame leg is provided for securing the frames to the walls, along with floor anchors
Shop Drawings
Welded vs. Knockdown Steel Door Frames
Capitol Fireproof Door manufactures welded and knockdown hollow metal door frames for commercial, industrial, and multifamily buildings throughout New York City and Long Island.
Welded Steel Frames
Welded frames are press-brake formed with jamb and head sections assembled using a tongue-and-groove arrangement. The miters are accurately fitted, fully welded, and ground smooth for a finished appearance.
Angle spreaders may be welded to the bottoms of masonry frames to maintain alignment during shipping and handling.
Knockdown Steel Frames
Knockdown frames are supplied as separate members that assemble at the opening using integral locking tabs.
Compression tabs help secure the frame to suitable drywall construction. These frames can be useful for renovation projects where a fully assembled frame is difficult to move through the building.
The appropriate frame type depends on wall construction, installation access, the specified opening, and applicable fire-rating requirements.
Steel Frame Gauges, Anchors & Reinforcement
Capitol manufactures welded steel frames using prime-quality cold-rolled steel in multiple gauges, with anchoring and hardware preparations based on project specifications.
| Steel Gauges | 12, 14, 16 and 18 gauge steel frame configurations. |
|---|---|
| Masonry Anchors | Anchoring options for installation in masonry wall openings. |
| Stud Anchors | Frame anchoring configurations for compatible stud wall construction. |
| Z Clip Anchors | Available where appropriate for the specified frame and wall conditions. |
| Frame Anchoring | Capitol specifies a minimum of three anchors per frame leg plus floor anchors for its described frame configurations. Final requirements depend on the approved assembly. |
| Hardware Preparation | Frames can be mortised, reinforced, drilled and tapped for compatible hinges, locks, closers and other hardware. |
Frame reinforcement must be coordinated with the hollow metal door , hardware and intended opening.
Sidelights, Transoms & Custom Jamb Widths
Capitol offers standard and custom steel frame dimensions, including varied jamb widths and trims for specialized commercial openings.
Welded frames can also be manufactured with attached sidelights and fixed transoms, subject to project requirements and applicable fire-rated assembly listings.
Which Frame Should You Specify?
Welded frames are often considered where rigid preassembled construction and a smooth welded finish are desired. Knockdown frames may be more practical for certain finished drywall openings and renovation conditions.
Browse Capitol's complete selection of fire rated doors or discuss a custom steel frame configuration with our team.
Request a Frame QuoteHelpful Commercial Fire Door Resources
Explore related information about custom fire doors, hollow metal construction, and installation considerations for NYC buildings.
Custom Fire Doors vs. Standard Fire-Rated Doors
Understand when standard door assemblies are appropriate and when a custom solution may be needed for unusual openings.
Read Article →Hollow Metal Fire Doors for NYC Commercial Buildings
Learn about hollow metal door construction, common applications, hardware and frame compatibility.
Read Article →Fire Door Installation in New York City
Explore the importance of proper frame installation, door clearances, hardware, and complete fire-rated assemblies.
Read Article →