The projection clearance, also known as swing clearance is defined as the amount of clearance needed as is determined by the arc of stairway as it swings open.
The three sections involved to determining the arc are (1) the top section in the down position, (2) the center section held out parallel to the floor, and (3) the thickness of the lower section hanging down from the end of the second section. See video below for further explanation.
Drop a plumb bob from the area where you expect the piano hinge to be located down to the floor.
Measure from the dropped plumb bob out to where you expect the bottom of the ladder to contact the floor.
NOTE: if any obstacles are encountered before you reach the minimum safe opening distance, the stairway will not open properly.
If you’re trying to open a stairway through an existing opening such as a hall way or door way, keep in mind that the area above the door facing could present a problem. In order to assure that the stairway will open properly, you should always consider the minimum projection needed in order for the attic stairway to open properly. Remember the projection required will never change regardless of actual floor to ceiling distance.
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