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Swistun, Inc. is a BBB Accredited Roofing/Siding Contractor in Wheeling, IL

IG vs. IG2™

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Why do I want to consider installation of IG since IG2™ seems to be the way to go?
IG has some advantages vs. IG2™:
  1. It can be installed at wooden roof, such as cedar shake.
  2. It has additional, much less expensive, effective ability to control speed of running water. This is useful at large metal roofs, or other slippery roofs.
  3. Costs much less.
  4. I think it looks better, since it does not have its flashy metallic appearance.

Where IG is not recommended?
  1. IG is not recommended at IG restricted trees. These are the trees, of which seeds or needles may get stuck in IG mesh.
  2. In gutter areas where there is a very little water drainage, means not enough drainage to periodically flash small particles, which are getting through over the time.

How do I manage gutter protection at cedar shake roof?
  1. Check the surrounding trees whether you can use IG. (Do not use IG when IG restricted tree is nearby.)
  2. Look at all gutter areas and note which gutters may have very small water drainage inside of them. In such areas you may freely use IG2™, in other areas use IG.
    • IG2™ in small water drainage areas will not be affected by wood roof lint, because it is a small water drainage. However it will very well protect gutter, where otherwise IG would let through too much dirt and there would be not enough passing through water to periodically flash this gutter out.
    • IG at higher drainage areas is safe for wood lint and that higher water drainage would be enough to periodically flush small dirt which comes through.

How do I manage gutter protection at large metal roof?
  1. Check the surrounding trees whether you can use IG. (Do not use IG when IG restricted tree is nearby.)
  2. At metal roof, due to its slippery surface, even whole long straight gutter areas may need to be considered as high flow areas. At such areas potential overflows at IG can be additionally protected by installation of up to 3/8” wide L shape trim. This is much less expensive than trying to install Water-Speed-Controllers on the roof along the entire gutter.

May I use much less expensive IG at houses where IG2™ would work very well?
Very often yes. Just make sure that:
  1. You do not have restricted trees around.
  2. You do not have small gutter areas, where due to small roof above (or no roof above) you have not enough water drainage to periodically flush the gutter.

Where to avoid IG installation?
IG does not perform well near certain types of trees. That’s why we would not recommend installing IG next to:
  1. Ash Trees with seeds (check first—not all ash trees have seeds). Ash Tree seeds can get stuck in IG’s mesh, creating a dam on top of the mesh that may linger around for a month or two at a time. Some of those seeds will slip through the mesh. If there’s enough of them and if the downspout is small (2" x 3"), they can form a dam over the downspout.

  2. Long-Needled Pine Trees. As with Ash Tree seeds, long pine needles can get stuck in IG’s mesh openings, creating a dam on top of the mesh. However, not many long needles can slip through the mesh, so you’re less likely to experience gutter dams. (Note: short-needled Spruce and Fir trees do NOT create this problem, so the first thing to do is identify your trees!)

  3. Locust Tree stems are in some ways similar to long pine needles and may negatively affect IG performance, but to a lesser degree. (We have installed IG near Locust Trees, and so far we have not observed any problems. Perhaps we are being overly cautious to consider the Locust a Restricted Tree, but we’d rather be safe than sorry.)