Deep Chimney Cleaning (PCR)

In our hands, deep cleaning is the procedure for the one deposit a brush genuinely can't beat: Stage-3 glazed creosote. This is creosote condensed and re-baked into a hard, shiny, enamel-like coating fused to the flue wall — concentrated fuel, and the deposit behind most catastrophic chimney fires. A rod-and-brush sweep glides over it without freeing a flake, so we come at it from two directions. The first is powered rotary tooling: a flexible shaft spun by a drill, carrying chain-knocker or flail heads sized and weighted to your liner, that mechanically fractures the glaze off the wall. The second, for glaze too hard or too thick to knock loose safely, is PCR — a Poultice Creosote Removal paste troweled onto the deposit, left to chemically soften and absorb it, then peeled away with the hardened creosote lifting out inside it. Used together, they return a flue to bare liner that a sweep alone would have left dangerously coated.

It pays to separate this from our chimney sweep service. A sweep is the routine annual cleaning for soft, brushable Stage 1–2 soot and creosote, and for most homes it's the right — and only — service needed. Deep cleaning sits at the far end, built specifically for the buildup a sweep can't clear, which is why we never sell it as a default. We camera-scope and grade the deposit first; if it's loose or flaky, you get a sweep, and we tell you so plainly. PCR-grade rotary work is held back for confirmed Stage-3 glaze, because running aggressive chain heads on a flue that only needed a brush is both wasteful and a fast way to wreck a sound liner. That's the whole distinction: routine cleaning is a sweep, glaze removal is this.

Because the tooling is powerful enough to damage the very liner it's cleaning, method selection has to be exacting. On clay tile we keep rotary speed controlled and lean on the poultice for the hardest glaze, since over-aggressive chain knocking can crack tile. On a stainless liner it's poly flails only, never steel, so the corrugations scour clean without gouging. The PCR compound is matched to the deposit and given its full dwell time rather than rushed, because a poultice that hasn't fully softened the glaze just smears it around. Through all of it, dual-stage HEPA negative-air containment captures the heavy, sticky debris this job throws off — far more than a routine sweep — so none of it migrates into the room.

Since glazed creosote is the deposit that ignites chimney fires, this is often the after-the-fire job: when a Level 2 scope turns up heavy Stage-3 glaze, the standard guidance is to stop burning until it's gone, and deep cleaning is how it goes. We scope before and after so the cleared flue is documented rather than assumed — and if the glaze proves so deeply fused that even rotary tooling and a poultice can't safely remove all of it, we'll say honestly that relining is the next step instead of grinding away at tile we might crack. Thick, layered glaze occasionally needs a second poultice pass between visits to break down fully. The same exacting standard runs through every project our crew leads: confirmed glaze, matched tooling, full poultice dwell, and a verified-clear scope before you light another fire.