Door building materials have to be durable and weather resistant. AZEK is a synthetic building material that is both. In addition to being weather resistant, it is mold, rot, and stain-resistant.
AZEK is the product name for carpentry materials made from PVC (Polyvinyl Chloride) plastic. This is the same material used for many plumbing pipes. As a plastic product, it can be shaped in many ways and textures can be formed on its surface. AZEK can be easily cut with standard tools like a table saw and pieces can be strongly bound together using a clear adhesive specifically made for the product. AZEK can be painted just like wood. Its one drawback is its price, which is more expensive than standard wood materials.
The following photos illustrate how to use AZEK planks to create an outdoor column.