How To Install A Cavity Slider
Tools & Materials Needed
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Spirit level
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Wedges/shims (plastic or timber)
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Drill and screws
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Tape measure
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Nail gun (optional)
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Expanding foam (optional)
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Packers
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Soft close mechanism (if applicable)
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Ensure the rough opening is 10–15 mm wider and taller than the cavity slider frame
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Make sure opening is plumb and square
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Remove any debris or obstructions from the opening
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Check the floor is level across the width of the opening
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Connect the end jamb/ closing jamb to the head of the unit
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Place the entire pre-assembled cavity slider unit into the opening
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Use a Level and check unit is plumb on both sides
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Level across the top
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Make sure Not twisted or bowed
TIP: Use wedges or packers at the base to lift the frame to level help level
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Use a spirit level to check that the frame is perfectly vertical (plumb) and the head (top) of the frame is level
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Adjust with shims or packers behind the jambs as needed
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Fix the frame to the wall framing using screws through the shims
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Start with the top screw, then check plumb again before fixing the bottom
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Use long screws through the frame for extra strength
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Slide the door open and closed to ensure:
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Smooth, unimpeded movement
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Consistent clearance at the head and floor
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Adjust the hanger bolts (usually accessible through the top slot) to raise or lower the door if needed
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If a soft close mechanism is installed, check its operation
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Ensure the door closes softly and smoothly without slamming
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Fill any gaps between the frame and wall with expanding foam or insulation
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Trim off excess shims
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Install architraves or trims to cover the gap between the frame and wall
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Ensure all fixings are tight but not overdriven
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Door slides freely and closes softly (if applicable)
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Pocket and door are square and flush with surrounding finishes
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