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How to Prepare an Opening to Replace Bifold Doors It's important to select the best bifold doors if you want to replace your old doors. Make sure they're weatherproofed and sealed properly to stop water infiltration and air leaks. To ensure an easy installation, you can have a helper. The kit you choose should be a combination of a width approximately an inch less than the framed opening and 1 to 2 inches shorter in height to allow for proper clearance on the floor. Selecting the right doors The type of do