If you have a prefabricated (factory-built) fireplace rather than a traditional masonry chimney, you need a chase cover — not a chimney cap. These two products serve the same basic function but are designed for very different chimney types. Here's how to tell which one you need.
A masonry chimney is built from brick, block, or stone. It has one or more clay tile flues that extend above the chimney crown. A chimney cap fits over the individual flue tile and is secured with set screws or a friction fit.
If you can see individual brick courses on your chimney exterior and clay tile flues at the top, you have a masonry chimney and need a chimney cap.
A prefabricated chimney consists of a metal chase — a wood-framed enclosure, often covered in siding or stucco — with a metal flue pipe running up through the center. The top of the chase is covered by a chase cover, which is a flat or slightly sloped metal panel that covers the entire top of the chase.
Chase covers are typically made from galvanized steel, stainless steel, or aluminum. The standard galvanized covers that come with most prefab chimneys are notorious for rusting — often within just a few years. A rusted chase cover allows water to enter the chase, which can damage the framing and the fireplace insert below.
Look at your chimney from the outside. If it's brick or stone with visible mortar joints, it's masonry. If it's covered in siding, stucco, or a smooth material that matches your home's exterior, it's likely a prefab chase.
If you're not sure, we can identify your chimney type during an inspection and recommend the appropriate cover.
If you have a prefab chimney with a galvanized chase cover, upgrading to stainless steel is one of the best investments you can make — we handle cap and chase cover installation. Stainless covers are significantly more durable and will outlast the original galvanized cover many times over.
Horizon Chimney Sweep serves Vancouver, Woodland, and all of Southwest Washington. Licensed, locally owned, and honest about what you need.