Recessed or surface grates 551installation manual

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Installation Guide #551 Frames Surface or recess mounting
1. Prepare the floor recess Prepare a recess in the concrete flooring where the mat will be located.
2. Drill anchor holes The mat frames should be secured to the concrete floor using anchor bolts into lead anchors that are set into the floor. Drill holes in the frames at about 2 foot intervals for the bolts. Countersink the holes. Set the frames into the recess at the appropriate locations to position the mat(s). Mark the hole locations on the concrete. Remove the frames and drill holes in the floor for anchors. Install the anchors using an anchor setting tool. 3. Secure frames in the recess Reinstall the frames. Secure them to the floor with 1/8” x 1 ½” anchor bolts into the lead anchors. NOTE: If necessary, shim under the frame sections so that the top edge of the frames is flush with the finished floor surface, and the frames are level.
4. Recheck all dimensions Before the concrete sets, recheck that: The frame sides are straight The frame corners are at correct angles so the mat will fit properly All inside dimensions of the frame are accurate according to drawing measurements If the frame bows inward, use spreaders inside the frame until the concrete is thoroughly set. IMPORTANT: The grate is made to fit snugly into the frame according to the drawing. Manufacturer or distributor cannot be responsible for problems that result from improperly installed frames.
5. Protect the frame edges When the concrete has hardened, install plywood or other material in the recess to protect the frame edges from damage until the grate is installed.