Pest ControlQuestion 77 of 319
To exclude rodents and crawling insects, gaps around exterior doors and cracks in walls should be sealed if they are larger than approximately:
a.One full inch on each side only
b.One quarter inch (1/4 in)
c.One inch
d.Gaps do not need to be sealed if the door looks closed
Explanation
A mouse can squeeze through a gap as small as about 1/4 inch. Cracks, holes, and door gaps of that size or larger should be sealed, fitted with door sweeps, or otherwise repaired. Window screens should be tight (mesh of at least 16 per square inch) and exterior doors should be self-closing.
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