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Bottom Seal and Weatherstrip Replacement

The shape of the gap under a closed door is diagnostic, and it decides whether a new seal will actually fix anything.

An even thin line of daylight across the full width means the door sits square and the rubber has simply hardened with age. That is the one case where replacing the seal on its own is the complete fix.

A wedge, wide at one end and tight at the other, means the door is not closing level. A new gasket on a door like that gets crushed at the low corner within weeks while still leaving a gap at the high one. The alignment is the fault, not the rubber.

A gap that changes shape between closings points at the rollers or track letting the door land in a slightly different position each time.

Retainer profiles are not interchangeable. The channel on the bottom of the door is either a T shape or a U shape, and the replacement has to match it.

The floor is half the seal. A slab with a dip gives the rubber nothing flat to close against, and no gasket compensates for that.