Detention Type Hollow Metal Frames


  1. Frames shall be constructed of commercial-quality cold-rolled steel that complies with ASTM A366. The steel shall be free of scale, pitting, coil breaks, or other surface defects. Metal thicknesses shall be 12 gauge or as specified.
  2. Frames shall be custom-made welded units of the sizes and types shown on approved shop drawings. Finished work shall be strong and rigid, neat in appearance, square, and free of defects, warps, or buckles. Pressed steel members shall be straight and of uniform profile throughout their lengths.
  3. Corner joints shall have contact edges closed tight with faces mitered and stops either butted or mitered. Corner joints shall be continuously welded, and the use of gussets or splice plates will be unacceptable.
  4. Stops: Minimum depth of stops in door openings shall be 3/4″. For glass and panel openings, stops shall be 1″ minimum glass or panel engagement, or as approved by the detention glazing manufacturer, to include rabbeted depth of stops.
  5. Loose Glazing Stops:

    1. Pressed steel angle glazing stops shall be no less than 10-gauge. Angle stops shall be mitered or coped and tight-fitting at the corner joints.
    2. There shall be individual threaded enclosed fasteners as backup welded under the frame where loose glazing stops are to be attached. The backup shall pass the test prescribed within this spec section. The fasteners shall provide a minimum of 10 threads of engagement and substantial protection from concrete seepage.
    3. The frame under the glazing stops and the inside of the glazing stop shall be chemically treated for maximum paint adhesion and painted with a rust-inhibitive primer prior to installation in the frame.
    4. Stops shall be secured with Torx head tamperproof machine fasteners where detention glazing is scheduled. Screws shall be Grade 8 buttonhead 1/4″ – 20 x proper length. Locate fasteners not more than 2″ from each end of glazing stop and not more than 6″ o.c.
    5. Removable stops shall be on the side opposite the area of inmate confinement or where they are likely to be unsupervised.
  6. Frames for multiple openings shall have mullion members that, after fabrication, are closed tubular shapes conforming to profiles shown and having no visible seams or joints. Joints between faces of abutted members shall be continuously welded and finished smooth. Joints between stops of abutted members shall be welded along the depth of the stop and left neat and uniform in appearance.
  7. Hardware Reinforcements and Preparation: Frames shall be mortised, reinforced, drilled, and tapped for all templated mortised hardware in accordance with the final approved Detention Hardware Schedule and templates provided by the hardware supplier. Where surface-mounted hardware is to be applied, frames shall be reinforced at factory, drilled, and tapped in accordance with final approved hardware schedules and templates by installer. Minimum thicknesses of hardware reinforcing plates shall be as follows:

    1. Hinge and pivot reinforcements – 1/4″ x 2″ x 10″ steel plate.
    2. Strike reinforcements – 7 gauge
    3. Closer reinforcements – 7 gauge
    4. Flush bolt reinforcements – 7 gauge
    5. Reinforcements for surface-applied hardware – 7 gauge
    6. Frame reinforcements for glazing stops – individual threaded enclosed fastener to provide backup and protection from grout.

      1. Hinge and pivot reinforcements shall consist of 1/4″ x 2″ x 10″ long straps projection-welded in a triangle pattern in three places at each end. The strap shall be additionally reinforced by a 12 gauge unitized stamped mortar box angle reinforcement, which is welded to two places to the inside face of the frame and at each end of mortar box forming a rigid reinforcement and a tightly closed mortar box.
      2. Where electrically operated hardware is required, hardware enclosures shall be provided. Lock pocket shall be 12-gauge steel welded all sides. An additional 7 ga. steel backup plate shall be spot-welded in the lock pocket to attach the lock to. Provide 7 ga. steel lock pocket cover plate deburred. Surface mount with 1/4-20 button head detention screws, with a minimum of eight (8) screws. These screws shall be equally spaced around the cover plate. Frame manufacturer shall install electrical conduit within the hollow metal door frame as required for specific electromechanical locks and door position switches. Minimum size of conduit shall be 3/4″ or as specified. Termination of conduit shall be within lock pocket and/or recessed mortar boxes.
  8. Floor anchors with two holes for fasteners shall be fastened inside jambs with at least four welds per anchor. Where so scheduled, adjustable floor anchors providing not less than 2″ height adjustment shall be fastened in place with at least four welds per anchor. Gauge thickness of floor anchors shall be 7-gauge steel.
  9. Frames shall have loose masonry “T” anchors for setting into masonry partitions or other appropriate anchors for conditions as shown. Provide other types of anchors when required for labeled conditions.
  10. Mortar guards made from no less than 26-gauge steel shall be welded in place at all hardware mortises on frames to be set in masonry or concrete openings.
  11. Frames shall be provided with two temporary steel spreaders welded to the feet of jambs to serve as bracing during shipping and handling. Remove before installation of frames.
  12. When shipping limitations or jobsite conditions so dictate, fabricate frames for large openings in sections designated for splicing in the field by frame installer. Where splicing is necessary, install angle splices at the corners of the profile and extend at least 4″ on either side of the joint. splicing angles shall be the same gauge thickness as the frame. General contractor to provide information before fabrication can begin.
  13. Prepare frame for silencers. Provide three single silencers for single doors on strike side and two single silencers on frame head at double doors with out mullions. Frames shall be shipped to project site with silencers installed. Removal of silencers by other trades shall be other trades responsibility to replace.