Helps Prevent Wood Rot
Wood siding, door/garage door trim, window trim: Gutters reduce the amount of water that makes contact with your house. This also reduces the risk of termites due to the fact they are attracted to wet wood.
Rain Water Diversion
Keep water off patios, decks, a/c units, entrances: Excessive rain water can cause premature failure of decks and a/c units.
Helps With Erosion
With no gutters installed, rain water can erode the soil adjacent to your house. This can compromise your foundation.
Keeps House Cleaner
Gutters eliminate splash back that can cause algae and mildew on the exterior walls of your home.