A Flat Cellar Door is used on an existing foundation that is already on an angle. (Typically the existing sloped walls are masonry)
Use the following illustration as a guide to assist you while you take the required measurements listed below.
Please measure the actual foundation since any old doors will be removed and the new door will mount directly to the foundation and house wall. In addition, it is important to measure in a variety of places in the even that the foundation has cracked and/or shifted.
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