The gap between door and wall is about 14.5mm(3/5") based on door thickness 40mm(1 4/7"). Door panel need to be cut a groove for floor guide, Groove Height:1"Width:3/5". The item "DIYHD Ceiling Mount Black Straight Roller Interior Barn Door Sliding Track Kit" is in sale since Wednesday, May 12, 2021.This item is in the category "Home & Garden\Home Improvement\Building & Hardware\Doors & Door Hardware\Other Door Hardware". The seller is "shengyinhardware" and is located in Milton, ON. This item can be shipped to Canada.