Tiny gaps between vinyl planks trap moisture and dirt, so eliminate them immediately to preserve waterproofing and appearance.

Start by confirming the subfloor is flat to within three sixteenth of an inch over a ten foot span and correct any high or low spots with a suitable floor leveler or underlayment. Use spacers consistently around the perimeter to maintain the recommended expansion gap and then remove them only after the last row is locked; this prevents edge creep that creates gaps later. For tight spots use a pull bar to draw boards together without stressing the locking mechanism, and for standard seams gently tap the planks with a tapping block and a soft mallet or hammer to seat the tongue into the groove evenly. Never force a plank past resistance because that can deform the locking profile and cause micro gaps; if a board will not lock easily, back it out and inspect the joint for debris or damage. Work row by row, checking alignment frequently and measuring stagger to keep end joints within the manufacturer recommended offset which reduces cumulative drift that creates gaps. If you encounter a plank with a damaged locking edge replace that piece immediately rather than trying to shim or fill the gap, because filler will not restore structural engagement and will likely fail under traffic.

The most common mistake is forcing pieces to fit which tears or bends the locking lip and leads to recurring gaps; stop, inspect, and replace damaged planks rather than risk long term failure. Another frequent issue is failing to control subfloor flatness which lets individual boards rock and separate; correct the flatness and use a full spread of underlayment to stabilize the floor. Third, installers sometimes skip frequent alignment checks and let small offsets accumulate into visible gaps; prevent that by checking every few rows, using a straight edge to confirm lines, and measuring off the same fixed point along the wall.

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