Timber Lakes · Wasatch County
Caps, Spark Arrestors and Chase Covers in Timber Lakes
On a wooded lot a chimney cap has a second job. It keeps weather and animals out, and it keeps embers in.
The spark arrestor is not optional here
Timber Lakes is a subdivision inside a forest. Every chimney serving a wood-burning appliance should terminate with a spark-arresting screen in sound condition, and that means checking it rather than assuming it. Screens corrode, they get crushed by sliding snow, and creosote will blind them off completely over a couple of seasons until they are a solid plate rather than a mesh. A blinded screen is bad twice over: it chokes your draft and it usually gets removed by a frustrated owner rather than cleaned, which leaves the flue throwing embers over a canopy of dry timber.
Chase covers rust from the inside out
Factory-built chimneys are housed in a framed chase with a metal lid on top. A great many of those lids were installed in galvanized steel with almost no slope, which means water and snowmelt sit on them instead of running off. They rust through at the low corner, and by the time you see a stain on the siding the water has been running down the outside of the pipe and into the framing for a year or more. A stainless cover with a real crown, a proper drip edge and cross-breaks to shed water is a permanent fix rather than another countdown.
Wind, snow and what gets in an open flue
An uncapped flue on a ridge lot takes wind-driven snow directly. It melts, refreezes in the smoke chamber and works into the masonry or the connector. Add the wildlife: squirrels and birds move into any warm dark shaft that has not been used since spring, and a seasonal cabin gives them months to do it undisturbed. A good cap with the right mesh size solves the whole category at once.
Waterproofing masonry at altitude
If you have a masonry chimney rather than a chase, the exposed brick or stone takes intense high-altitude sun in summer and repeated freezing in winter. Water in the pores is what turns that into spalled faces. The treatment is a vapor-permeable siloxane that lets the masonry breathe outward while shedding liquid water. It is not a sealer and it should never be a film-forming one, because trapping moisture inside masonry that freezes is how you accelerate exactly the damage you were trying to prevent.
Questions
Caps & Dampers in Timber Lakes — common questions
Is a spark arrestor actually required on a wooded lot like ours?
It is standard practice for any solid-fuel chimney and it matters far more in a forested subdivision than it does in town. The screen catches embers that would otherwise land on dry timber. Just as important, it has to be kept clear, because creosote blinds a screen off within a couple of seasons.
There is a rust stain running down the siding below my chimney chase. What is that?
That is your chase cover failing. Flat galvanized covers pond water and rust through at the low corner, then the water runs down inside the chase onto the framing. Replacing it with a sloped stainless cover ends the problem for good.
Something is nesting in my chimney. Can a cap prevent that?
Yes, and it is the only reliable prevention. A cap with correctly sized mesh keeps birds, squirrels and wasps out of the flue. On a cabin that sits empty for months that is worth more here than almost anywhere.
Should I seal my chimney brick to keep the water out?
Use a vapor-permeable siloxane, never a film-forming sealer. The wall needs to keep releasing vapor from the inside face outward. Trap moisture behind a sealed surface at this elevation and the next freeze will pop the brick face off.
Also in Timber Lakes
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Chimney Sweep Inspection Chimney Repair Fireplace Repair Installation Gas Fireplace Dryer Vents All Timber Lakes services
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