1) A gutter system will help reduce water and moisture damage to your home. When it rains, water collects next to your house. This water can cause damage to your foundation and cause leaks in your basement.
2) Without gutters, rain runs directly down the roof creating a sheet of water. Coming and going from your home without getting drenched by the waterfall effect this creates will be difficult.
3) Gutters keep water away from your siding, fascia , soffit , door jams and window sills preventing them from staining and rotting. Also, if your house is painted, the splash from the rain falling directly around your home may cause discoloration and peeling over time.
Splash blocks help direct water from your downspouts away from your foundation.
Valley splash guards guide the water into your gutters, preventing it from over shooting your gutters during a heavy rain.
Gutter guard allows the water you want channeled away from your home in and keeps the leaves and other debris out, reducing the amount of required cleaning.