A crack needs context: location, movement, water entry, and the surrounding masonry. Widening cracks, leaning, or loose masonry call for keeping clear and prompt professional evaluation.
Updated September 10, 2026
Your home in South Lake Tahoe.
About 81% of occupied homes in South Lake Tahoe heat primarily with utility gas. Many chimneys in South Lake Tahoe therefore vent a gas furnace, boiler, or water heater rather than a wood fire, and those flues still need inspection for liner condition, moisture, and blockage. About 3.0% of occupied homes in South Lake Tahoe use wood as their primary heating fuel. A wood-burning system that runs through the season needs creosote and liner inspection on a regular schedule. The nearest NOAA climate normals station (South Lake Tahoe Airport, about 2 miles from the South Lake Tahoe city center) averages 7,731 heating degree days per year. That is a long heating season in which venting runs for months and freeze-thaw cycles work on exposed masonry, so check exposed brick and the crown after winter from a safe position.
What you can observe safely
- Photograph visible cracks safely from ground level.
- Keep any earlier photos for comparison.
What to avoid
- Do not climb onto the roof or enter the chimney.
- Do not alter gas components, venting, or safety controls.
- Do not use a test fire to diagnose the problem.
Possible causes to assess
- Masonry or mortar deterioration
- Movement requiring assessment
- Water-related damage
A symptom cannot establish the cause remotely. An assessment of the complete system helps determine the appropriate repair.
Chimney repair in South Lake TahoeA few common questions
Can this be diagnosed from a photo?
A photo can document a symptom and help prepare a visit. It cannot confirm concealed conditions or establish that a chimney or fuel-burning appliance is safe.