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Measure the width of the carpet tiles. Measure this distance out from the longest, straightest wall and snap a chalk line across the room at this point.
Tip: Walls aren't necessarily straight, especially in older homes. Snapping a straight line means the tiles will line up straight even if the wall doesn't; baseboard molding will cover gaps between tiles and the wall.
Use double-sided carpet tape to adhere tiles to the floor. If installing carpet tiles over hidden in-floor storage bins, don't tape down the tiles over the bins.
Trim as needed. Trim the carpet tiles as needed using a metal straight edge and a sharp utility knife.
Tip: To trim tiles neatly, flip the tile carpet-side down. Don't try to cut through the depth of the tile all at once. Instead, score the tile several times with a sharp utility blade — using a straight edge as a guide
Replace any baseboard molding or install new molding, as desired, to cover gaps between the carpet tiles and the wall.