When installing eavestroughs (also known as gutters) on a metal roof, it's important to choose a type that complements the roofing material and handles the specific challenges associated with metal roofs. Here are the key considerations and recommended types of eavestroughs for metal roofs:

Key Considerations

  1. Material Compatibility: Ensure that the eavestrough material is compatible with the metal roof to prevent galvanic corrosion.
  2. Durability: Metal roofs often have longer lifespans, so the eavestrough material should also be durable and long-lasting.
  3. Installation Method: Metal roofs can expand and contract significantly with temperature changes, so the attachment method for the eavestrough should accommodate this movement.
  4. Capacity and Size: Metal roofs typically shed water quickly, so the eavestrough should be able to handle high volumes of water to prevent overflow.

Recommended Types of Eavestroughs

  1. Aluminum Gutters:

    • Pros: Lightweight, resistant to rust and corrosion, available in various colors and styles, and relatively easy to install.
    • Cons: Can be damaged by heavy impacts or extreme weather conditions.

  2. Galvanized Steel Gutters:

    • Pros: Strong and durable, can handle heavy loads and extreme weather, and often come with a protective coating to prevent rust.
    • Cons: Heavier than aluminum and may require more maintenance to prevent rust over time.

  3. Stainless Steel Gutters:

    • Pros: Extremely durable, resistant to rust and corrosion, and have a sleek appearance.
    • Cons: More expensive than other materials and can be heavier, requiring more robust support.

  4. Copper Gutters:

    • Pros: Highly durable, long-lasting, and develop a natural patina that adds aesthetic value over time.
    • Cons: Very expensive and require professional installation.

  5. Vinyl Gutters:

    • Pros: Lightweight, easy to install, and affordable.
    • Cons: Less durable than metal options, can become brittle in cold weather, and may fade or warp with exposure to UV light.

Installation Tips

  1. Hanger Spacing: Use heavy-duty hangers and place them closer together (typically every 2 feet) to support the weight of the gutters and the water they collect.
  2. Expansion Joints: Install expansion joints to accommodate the thermal expansion and contraction of both the roof and the gutters.
  3. Proper Slope: Ensure the gutters are sloped correctly (about 1/4 inch per 10 feet) to allow for proper drainage.
  4. Snow Guards: Consider installing snow guards or snow rails on the roof to prevent large amounts of snow and ice from sliding off and damaging the gutters.
  5. Sealants and Fasteners: Use sealants and fasteners that are compatible with both the gutter material and the metal roof to prevent corrosion and ensure a secure installation.

Conclusion

For a metal roof, aluminum gutters are often the best overall choice due to their balance of cost, durability, and ease of installation. However, galvanized steel, stainless steel, or copper gutters can be excellent choices depending on your budget and specific requirements. Always consider the climate and potential weather challenges in your area when making a decision, and ensure professional installation to maximize the lifespan and performance of your eavestrough system.