Chimney and fireplace questions, answered

NFPA 211 calls for an inspection at least annually and cleaning whenever deposits warrant it. For a wood-burning fireplace used regularly through OKC's burn season, annual cleaning before the season starts is the standard recommendation.

Creosote is the combustible deposit left by wood combustion on the interior surfaces of a flue liner. It accumulates in three stages: soft and brushable, tar-like, and hardened glaze. Each successive stage is harder to remove and represents a greater fire risk. Stage-three glazed creosote is the primary fuel source in chimney fires.

Standard cleaning removes soft stage-one and stage-two deposits with brushes. Glazed creosote - stage three - has hardened to a shiny, tar-like surface that brushes cannot remove. It requires chemical conversion treatment before mechanical removal. These are different procedures with different materials and time requirements.

Level 1 is a visual inspection of accessible areas for a system in routine use with no changes. Level 2 is required at change of ownership, after a chimney fire, or before a real estate transaction - it includes video scanning of the flue. Level 3 is used when a serious hazard is suspected and may require component removal. All three levels are defined by NFPA 211.

NFPA 211 specifies that a level 2 inspection is appropriate at the time of a real estate transaction. A level 2 inspection includes video scanning of the flue liner, which is the only way to assess liner condition without tearing open the wall.

A carbon monoxide safety inspection checks combustion appliance flues and connections for conditions that could allow CO to enter the living space - blocked flues, cracked liners, failed venting, or backdrafting. We check carbon monoxide risk on every gas fireplace service call.

A chimney can take water in through the crown (the concrete cap at the top of the masonry), through open mortar joints, through failed flashing at the roofline, or through the liner itself. A cap only covers the flue opening. A leak inspection traces the actual entry point before any repair begins.

That is efflorescence - mineral salts that water carries through the masonry and deposits on the exterior face as it evaporates. It indicates that water is moving through the brick. Cleaning the staining without finding and correcting the water path means it will return.

OKC's climate combines a long burn season (roughly October through March), high summer humidity, more than 50 severe weather days per year on average, and freeze-thaw cycles in spring and fall. Hairline cracks in crowns and mortar absorb water, freeze, and widen. The damage accumulates during the off-season and is revealed when the system is next put to use.

The chimney crown is the concrete cap that seals the top of the masonry chimney around the flue opening. It sheds water away from the brick stack. Crowns crack from freeze-thaw cycling - water enters a hairline crack in spring, expands when temperatures drop, and widens the crack. A cracked crown is one of the most common chimney water entry points in Oklahoma City.

Repointing (also called tuck-pointing) is the removal of deteriorated mortar from the joints between bricks and replacement with fresh mortar matched to the existing masonry. The mortar joints are the primary weather barrier in a brick chimney. When they erode, water enters the brick cores and structural integrity deteriorates.

A liner replacement is needed when the existing liner is cracked, missing, or deteriorated to the point that it no longer safely contains combustion gases, or when the appliance type changes. A level 2 inspection with video scanning is the standard way to evaluate liner condition.

Yes. A gas fireplace or gas insert should be inspected annually: burner condition, pilot, ignition system, venting, gas connections, and controls. Carbon monoxide risk increases when gas appliance venting is not maintained.

In most cases, yes. Gas logs can be installed in an existing wood-burning firebox. The appropriate liner and venting configuration depends on whether the logs are vented or vent-free, and the condition of the existing flue.

Yes. We clean and repair commercial chimney and exhaust flue systems including commercial boiler flues and multi-unit residential buildings, and provide HOA and annual maintenance plans for properties needing documented annual service.

Call (405) 451-4866 or email info@okchimneysweep.com. We dispatch from Oklahoma City and serve the OKC area.

We provide emergency services for active chimney leaks, storm damage, furnace flue blockages, and emergency spalling brick repair. Call us directly at (405) 451-4866 for urgent situations.