Pella 81CM0100 installation instructions 4JMM
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2 OPENING PREPARATION (CONTINUED)

I.Construct a sill pan for the door. Measure the rough opening width and add 2". Measure 1" up from each end and cut through the vertical leg of the pan material. If there is a step down at the exterior of the door opening, make the sill pan depth equal to the door frame depth - 2-1/8". If there is NO step down, make the sill pan depth equal to the frame depth. Bend the bottom (side) flaps of the pan material up, then bend the back leg around the end of the pan.

Dry fit the sill pan and the door into the opening.

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J.If there is a step down at the exterior of the door opening, cut the sill nosing to the rough opening width plus two times the flange width. Notch the sill nosing. If there is NO step down, skip to step K.

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Note: If the new door frame is deeper than the existing door frame, it will be necessary to cut the interior flooring material back to allow the door flush flanges to contact the existing aluminum door frame.