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It's all about the eaves
A roof should overhang walls by at least one foot. That keeps the sun off windows and exteriors, which helps the house stay cool in summer.

It also protects siding from the weather, meaning you may be able to go twice as long between repaintings or re-sidings.

NEXT: Reuse and remodel

Last updated August 22 2008: 9:53 AM ET
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