The cap is the smallest part of a chimney and one of the most consequential, because it is the single thing standing between the open top of your flue and everything the weather, the wildlife, and the sky want to put down it. A missing or rusted cap lets rain pour straight into the flue and the masonry, invites squirrels, raccoons, and birds to nest in the smoke chamber, and lets sparks escape onto the roof. Chimney Check Crew installs stainless steel caps across Philadelphia, sized and fitted to your particular flue, so the chimney is sealed against the weather and the animals while the smoke still draws freely. On the older stone chimneys up here, a good cap is also the cheapest insurance there is against the water damage that drives the most expensive repairs.
- Stainless caps sized and fitted to your flue
- Rain and snow kept out of the flue and masonry
- Animal and bird entry blocked at the top
- Spark arrestor screen to keep embers off the roof
- Multi-flue and custom caps for older chimneys
- Old, rusted, or ill-fitting caps removed and replaced
What a missing or failed cap actually costs you
An open or uncapped flue is an open invitation, and the damage comes from several directions at once. Rain and snow fall straight down the flue, soaking the liner, the smoke chamber, the damper, and the firebox, rusting the metal parts and saturating the masonry. Animals treat an open flue as a ready-made den, and a squirrel or raccoon nest in the smoke chamber is both a fire hazard and a draft blocker, to say nothing of what happens when an animal cannot get back out. And on a windy night an uncapped flue lets embers ride the draft straight up and out onto the roof, which on the tree-shaded blocks up here is a risk worth taking seriously.
The water is the quiet killer, though. A flue that takes rain all year long feeds every other chimney problem there is. It rusts the damper until it will not seat, it saturates the masonry so freeze-thaw can break it apart, and it accelerates the breakdown of the liner from the inside. A great many of the expensive repairs we are called to make on Northwest Philadelphia chimneys trace back, one way or another, to years of rain falling down an uncapped flue that a forty-dollar problem could have prevented. The cap is small, but the protection it provides is not.
Fitting the right cap to an older flue
Not every cap fits every chimney, and on the older homes up here that matters more than people expect. Many of these chimneys have multiple flues sharing one stack, oversized or irregular masonry openings, clay tiles that protrude at different heights, or crowns that were never built to take a standard cap. A cap pulled off a shelf and forced into place either does not seal, does not stay, or chokes the draft, and a cap that throttles the draft is its own problem. We measure the flue or flues, look at how the crown is built, and fit a stainless cap that actually matches your chimney, including multi-flue and custom caps where the stack calls for one.
Stainless steel is what we install because it is what lasts. The galvanized caps that come on many older chimneys rust through within a handful of years in this climate, and a rusted cap is barely better than no cap. A quality stainless cap shrugs off the weather, carries a spark arrestor screen to keep embers in and animals out, and keeps the draft open so the chimney still pulls smoke cleanly. We remove the old or rusted cap, fit the new one securely so wind cannot lift it, and make sure it is sealing and breathing the way it should before we call the job done.
A small purchase that protects a large one
Of all the work a chimney can have done, a cap is among the best values, precisely because it heads off the slow, expensive damage that nobody notices until it is serious. A cap costs a small fraction of the crown rebuild, the reline, or the masonry repair it helps prevent, and it does its work silently year-round, every rain and every windy night, with no maintenance asked of you. On a working chimney it also keeps animals out of the flue and embers off the roof, two problems that are far cheaper to prevent than to deal with after the fact.
A cap also pairs naturally with other chimney work, and lining the two up often makes good sense. With the crew already on the roof for a sweep, an inspection, or a crown repair, fitting a new cap at the same time spares you a second visit and ensures the flue is sealed against the weather from that day forward. That said, a cap need not wait on other work. If yours is missing, rusted through, or clearly the wrong size for the flue, it deserves attention in its own right before the next wet stretch sends more water down the chimney. We will tell you honestly what your flue needs and fit a cap that does the job for the long haul.
Pulling your whole chimney project together
A chimney is a system, so chimney cap installation rarely stands alone, it connects to creosote removal, chimney camera scan, chimney repair, chimney relining, chimney repointing, and our crew handles all of it under one roof. We bring the same service to Germantown chimney cap installation, Manayunk chimney cap installation, Chimney Cap Installation in Roxborough, Chimney Cap Installation in Mount Airy and everywhere else across the Philadelphia area.
If you searched for local chimney service, you have reached a local crew, call 215-602-7629 any time. For background, read Chimney Draft Problems: Why Your Fireplace Smokes and How to Fix It on our blog, or head back to our Philadelphia home page to see everything we do.