Finish TradesQuestion 431 of 700
When installing a prehung exterior entry door, which step is MOST important to ensure the door operates correctly and seals against weather?
a.Fastening the jamb tight to the framing with no shims
b.Plumbing, squaring, and shimming the jamb so the reveal is even before final fastening
c.Trimming the door slab narrower than the opening
d.Leaving the threshold unsealed for drainage
Explanation
A prehung door must be set plumb, square, and shimmed so the reveal around the slab is uniform, which lets it latch, swing, and weatherseal properly. Fastening tight without shims racks the jamb, trimming the slab narrow ruins the seal, and leaving the threshold unsealed invites water intrusion.
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