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Hollow Metal Frames We stock a full line of standard jambs ready for welding to make a one piece unit and the knockdown drywall 3 piece unit type. The knockdown (KD DW) type is used for installation after the drywall is already up. The welded type is the one used most often and can be installed in exterior walls or interior stud walls. The hollow metal frames we offer include 18, 16 (our standard), 14, and 12 gauge frames for welding which go into a masonry wall or a stud wall. These are available in jamb depths from 3" to 20". Anything with a jamb depth less than 4 3/4" will be a single rabbet frame. The knockdown drywall frames are available in 18, 16 (std.), and 14 gauge. These frames are available in jamb depths from 4 3/4" to 14" in double rabbet and 3 1/4" to 4 3/8" single rabbet. All frames that will have any surface mounted hardware applied will have reinforcement plates welded in at the necessary locations. We also keep a full stock of blank stick material and mullions to make transoms and sidelites to your specifications. All frames are available cold rolled or A60 galvannealed. Knockdown drywall frame: Although there are certainly variations, the most common stud walls in our area consist of 3 5/8" studs with either 1/2" (4 5/8" wall) or 5/8" drywall (4 7/8" wall) or 6" studs with 5/8" drywall (7 1/4" wall). The kd dw frame is meant to go over the drywall and comes in 3 separate pieces: the hinge jamb, strike jamb (two hinge jambs if it's a pair of doors), and the head. There are "compression anchors" (shown below right) in the top of each jamb and pre drilled holes on each side of each jamb at the bottom so no loose or separate anchores are required with this frame as they are part of the unit. To install it you simply slide the head in place over the wall, install the hinge jamb by aligning the tabs in the top of the jamb with the slots in the head and pushing it over the wall, install the strike jamb (or other hinge jamb if it is a pair of doors) the same way as the hinge jamb. Pull the head down tightly with the jambs and level by shimming at the base of the jambs if needed. Tighten the compression anchors, make sure the frame is square and level, and install sheet metal screws in the bottom holes. It is a good idea to cut a wood spreader bar to the exact door opening width and insert it at the bottom of the frame to keep the frame square during installation. 
It is installed in stud walls before the drywall goes up with either universal stud anchors, "Z" anchors, or strap anchors. Stud anchors (shown) clip inside the frame and have tabs on each side that bend around and wrap the stud. There are pre-drilled holes so you can screw the tabs to the stud. 6'8" and 7'0" frames are supplied with 6 anchors while 8'0" frames will have 8. Anchors are also discussed on the hollow metal frame anchors page.
Rough opening size, welded frame: Take the nominal door width and add 4 1/4" and the nominal door height and add 2 1/4". Keep in mind that on a 3070 door, the nominal measurements are 3'0" x 7'0" while the actual measurements are 2' 11 3/4" x 6' 11 1/8". Using a 3070 door as an example, the rough opening size for a welded frame would be 3' 4 1/4" x 7' 2 1/4". Since the standard face on a hollow metal frame is 2", the outside dimensions of a 3070 frame will be 3'4" x 7'2" so this RO dimension will give you 1/4" of "play" on all 3 sides. If you are installing a welded frame into a fire rated stud wall, remember that the drywall will have to extend at least 1/2" into the frame so you can not simply butt the drywall up to the frame at fire rated openings. On non-rated openings you run the drywall down to the frame or caulk the seam if it is going into block. |
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