Before you decide whether or not you need to install gutters, it's important to understand why rain gutters exist, and what they do.
 

The most basic explanation is that gutters collect rainwater running off the roof. Then the gutters direct that water into a downspout, where it can be safely directed away from the home.

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Gutters work to keep your foundation from eroding, keeps your landscape intact, and avoids water damage to your siding and exterior.

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If you are noticing water problems in your home that you suspect is due to your roof's lack of gutters, you're probably right.