the wood or concrete surface on which the current doorsill rests (and not the flooring surface or underlayment). Measure from the lintel down to the subfloor, i.e. Measure the height on both sides of the opening.Remove the door’s interior trim to expose the jambs. If the door frame is resting directly against the jambs, the installation is not conform and you must to mention this when purchasing the new door.ġ.1. The rough opening is usually 1? higher and wider (in total) than the door frame, to leave space for inserting the shims for adjustment. Taking accurate measurements is very important in order to buy or order a door of exactly the right size. Another way to avoid leaving an open hole in the wall is to remove the siding at the last minute. In the case of a new installation, keep some plywood boards handy to cover the opening if the project is not completed the same day. This strip is only used when installing new vinyl siding and must be removed if the siding is made of brick or if the old vinyl siding is to be reused. It is possible to replace a standard door with a custom door, but since the new custom door will be framed with brick moulding, you will need to cut away the exterior siding around the opening, and this can be tricky if the siding is made of brick.īrick moulding sometimes comes with a strip at the back that forms a channel into which the vinyl siding slots. When replacing a patio door, choose the same type as the old one. Standard doors do not require brick moulding because the exterior siding comes right up to the wall opening. This type of door, available in-store, is used mainly for installations where a new opening is cut in an existing wall. These doors come with brick moulding (or brick mould) – the trim that covers the gap between the rough opening and the exterior siding (which may or may not be made of brick).Ī standard patio door comes with a simple box frame. Custom doors are used mainly with new builds, where the exterior siding does not generally come right up to the rough opening. Refer to the manufacturer’s instructions.Ī custom patio door is made to fit the size and thickness of a specific wall opening. Some of the steps may not apply to your installation. This project describes how to replace a patio door, of which there are two types: custom or standard.
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