Rainwater Gutter System A rainwater gutter system is a series of channels or troughs installed along the eaves of a roof to collect and redirect rainwater away from a building's foundation. Rain gutters are typically made of metal, plastic, or wood and come in various shapes and sizes. The main purpose of a rain gutter system is to prevent water damage to a building's foundation, walls, and landscaping. Without gutters, rainwater can collect around a building's foundation, which can cause soil erosion, basement flooding, and damage to the building's structure. Rain gutters also help to prevent water from accumulating on a roof, which can lead to damage to the roof's shingles, fascia, and soffits. Additionally, gutters can prevent water from pouring off the roof and onto sidewalks or driveways, which can create safety hazards.