What’s That Film On My Siding? All About Oxidation

Vinyl siding is the most popular exterior cladding in Canada. Homeowners love it because it’s a durable, versatile, and affordable material that is easy to install and maintain. Over time, though, you may notice a white chalky substance on the surface of your vinyl siding and trim.

What you’re seeing is oxidation. It’s a natural process that happens when the polyvinyl chloride (PVC) material is exposed to oxygen in the air, resulting in a chemical change that alters its appearance. Specifically, with vinyl siding, exposure to sunlight and other environmental factors can cause the material to break down and lose its original color and luster.

Oxidation on siding can be influenced by various factors, including exposure to sunlight, moisture, pollutants, and temperature changes. Over time, these factors can cause the siding material to degrade and oxidize, resulting in a worn or faded appearance.

To prevent or minimize oxidation on siding, regular maintenance is key. This can include cleaning the siding to remove dirt, debris, and pollutants that can accelerate the oxidation process.

A professional house wash can certainly help minimize and will most certainly help prevent oxidation in the first place. If oxidation has already occurred, there are options for restoring the siding's appearance, however this is not a service I provide. The removal of advanced oxidation (and its stains) may require the assistance of a restoration company.

It is important to note that oxidation on siding is a natural process that can occur over time due to exposure to the elements. While it may affect the appearance of the siding, it does not typically impact the structural integrity of the material.

Regular maintenance and proper care can help extend the lifespan of your siding and keep it looking its best.