Coil Calamity

Tip: click on any image below to view it full-size.

In an attempt to speed up window work, wood trim is often covered with aluminum, known as “coil” in the trade, as shown here. This prevents the wood underneath from “breathing” and traps moisture, leading to underlying rot, which is often not visible until major damage is done.

Also, because of its unsightly appearance, coil is not allowed in Chicago Landmark districts, and we do not recommend it be used anywhere.