Gain Expertise in Just a Few Steps: Create a Perfect Window Corner Sill Wrap with Aluminum Coil

Wrapping a window corner sill with aluminum coil is a great way to give your home a modern aesthetic and increase its durability. Taking the right measures during the installation process can ensure that you get the best possible results that will last for years.

The first step to wrapping a window corner sill is to measure your window sill accurately and add about 3 inches to the width for the extra 1½ inches on either side of the sill. Then, add about 1/8 inch to each of your measurements for the face, top, and underside of your window sill. Add these measurements together and transfer that sum to the coil stock and brake to form the base of your window sill. Make sure that the coil fits loosely and not tightly around the sill.

Next, you will need to make sure that the frame of the window fits perfectly, and you might need to try a few pieces before you achieve the correct fit. Make slight bends and cuts to get the right fit. To create the corner caps, hold the aluminum sill cap up to the window sill and mark each end of the sill. Cut the slits up to the marks you’ve made and make a box-like form with the tabs by bending them over the sill.

When installing the aluminum coil, it is essential to know what you are trying to prevent. If it is not done correctly, moisture can easily get in and expose the wall cavity, resulting in bigger issues like pests, mold and damage to the warranty of the window. Proper installation of the aluminum coil will protect your home from outside elements like moisture, dust, heat and wind.

Before you start, be sure to have all the necessary hardware you need in advance. Measure the area correctly and, if possible, use a jig saw to ensure accuracy. The process will go much faster and smoother if you have all the right parts and tools ready. Make sure that the aluminum coil fits loosely and not tightly around the sill and that the frame has a perfect fit with relief cuts and bends. Installing the aluminum coil is a much simpler process when the first measurement is precise and accurate.