The cap is the small, inexpensive part at the very top of the chimney that prevents a long list of expensive problems below it. An open flue is an open invitation to rain, to leaves and debris, to birds and squirrels looking for a sheltered place to nest, and to the downdrafts that push smoke back into the room. Philly Flue Pros installs chimney caps across West and Southwest Philadelphia that are sized and fitted to the actual flue, built to last in city weather, and chosen to do their job without choking the draft. On a multi-flue Victorian stack or a tall rowhome chimney, getting the cap right is a genuinely worthwhile, low-cost upgrade.
- Caps sized and fitted to the actual flue, not forced to fit
- Rain and snow kept out of the flue and off the liner
- Animals and nesting birds shut out of the chimney
- Spark and ember screening where the appliance calls for it
- Multi-flue stacks fitted with the right cap configuration
- Durable materials chosen to last in Philadelphia weather
Everything a cap quietly keeps out
An uncapped flue takes everything the sky and the street throw at it. Rain and snow fall straight down the open top, soaking the liner, the smoke chamber, and the firebox, accelerating the decay of the masonry and, on a gas-vented flue, adding to the moisture that already eats at the liner. Water in the flue is one of the most common and most overlooked causes of chimney deterioration, and a cap stops it at the source for a fraction of what the water damage costs to repair. The cap also keeps out the wind-driven debris that collects in an open flue and chokes the draft over time.
Then there are the animals. An open chimney is, to a bird or a squirrel, a ready-made sheltered cavity, and they will nest in it. We regularly clear nests, leaves, and the carcasses of animals that got in and could not get out, all of which block the flue, create a serious fire and carbon-monoxide hazard, and leave a homeowner with a fireplace that suddenly will not draw. A properly fitted cap with the right screening shuts the flue to all of it while still letting the smoke and exhaust out cleanly. It is the cheapest insurance a chimney can carry.
Sizing and fitting the cap to your chimney
A cap only does its job if it fits the flue and suits the way the chimney is used, and on the older homes here that is not a one-size choice. The broad Victorian stacks of Overbrook and Wynnefield often carry more than one flue under a single crown, which calls for individual caps or a single multi-flue cap configured so the separate flues do not cross-contaminate. The tall, narrow rowhome flues of Kingsessing, Elmwood, and Paschall need a cap sized so it sheds water and blocks animals without restricting a draft that is already working hard up a long, slender column. We measure the actual flue and fit the cap accordingly rather than wedging a stock part onto whatever is up there.
Material and build quality matter too, because the cap lives in the harshest spot on the house, fully exposed at the top of the stack. A flimsy cap rusts, loosens, and blows off in a storm, and then you are back to an open flue plus a cap repair. We install caps built to hold up in Philadelphia weather, fastened securely so a windy night does not undo the work. Where the appliance below calls for spark arrestor screening to catch embers, we fit that as well, so the cap protects against fire from inside the flue as well as weather and animals from outside it.
A small step that protects the whole flue
Of all the work a chimney can have done, a cap is among the best values, precisely because it heads off the slow, costly damage that water and animals cause when no one is watching. A cap almost always costs a small fraction of the liner replacement, masonry repair, and blockage clearing it prevents, and it pays for itself the first time it keeps a winter's worth of rain and snow out of the flue. For a part that sits out of sight and out of mind, it does a remarkable amount of work.
We will look at your chimney, tell you honestly whether your current cap is doing its job or whether the flue is open or poorly capped, and recommend the cap that actually fits your stack. If a fireplace has stopped drawing, if you hear or see animals in the chimney, or if water is finding its way into the firebox, a missing or failed cap is one of the first things to check, and the fix is usually quick and straightforward. It is one of the easiest ways to add years to the life of the whole chimney.
The full scope of your Philadelphia chimney work
A chimney is a system, so chimney cap installation rarely stands alone, it connects to chimney cleaning, chimney inspection, chimney leak repair, flue relining, chimney masonry repair, and our crew handles all of it under one roof. We bring the same service to Chimney Cap Installation in Overbrook, Chimney Cap Installation in Wynnefield, Chimney Cap Installation in Kingsessing, Elmwood Park chimney cap installation and everywhere else across the Philadelphia area.
If you searched for local chimney service, you have reached a local crew, call 215-602-7630 any time. For background, read Where a Rowhome Chimney Meets the Roof: The Leak Owners Miss on our blog, or head back to our Philadelphia home page to see everything we do.