Recessed grates 420 installation


How to install frame for recessed grate system in concrete / grout

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Installation Guide #420 Frames Recessed grate frame types for deep recess
1. Prepare the floor recess

Prepare a recess in the concrete flooring where the grate will be located. The recess should be at least:
  • 2 and 1/2 inches (65mm) deep
  • 6 inches (150 mm) wider than the outside dimensions of the frame - this allows 3 inches¯ (75 mm) on all sides to maneuver the frame into position.
    		•  Preparing floor recess for the frame
    2. Install anchor bolts

    Slide 1/4¯ x 3 inches anchor bolts (with nuts) into the frames from the end. If you were unable to allow the 3 inch (75 mm) spacing specified above, you may have to bend the bolts so the assembled frame will fit into the recess. Space the bolts at approximately 2 foot intervals along the frame sections.     		Installing anchors into the frame
    3. Assemble the frame

    Using the screws provided, assemble the frame.     		Assemble the frame
    4. Place the frame in the recess

    Set the frame in the recess at the desired location.
    Use wooden shims to:
  • Raise the frame so the top will be blush with the finished floor surface.
  • Level the frame
    		•  Place the frame into the resess
    5. Pour concrete

    Pour concrete (or grout) around the edges and in the center of the frame, until the concrete is level with the lip on the 420-L frame sections.     		Pour concrete arounf the frame
    6. Level the concrete

    Cut a board just slightly shorter than the width of the frame. Use the board to smooth and level the concrete.
    Be very careful that the concrete is absolutely smooth and level with the inside lip of the frame. This will allow the grate to lie perfectly flat and avoid rocking.     		Leveling concrete within the recess
    7. Recheck all dimensions

    Before the concrete sets, recheck that:
  • The frame sides are straight
  • The frame corners are at correct angles so the grate 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.     		Rechecking the frame before concrete sets
    Checking and reinforcing if needed frame shape
    8. 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.     		Protecting frame edges