Western US

Coastal + interior valleys — wildfire-zone spark-arrestor compliance is critical.

Wet winters, dry summers — wood-burning is heavy west of the Cascades.

Wet coastal, dry interior — moisture intrusion is the dominant west-side failure.

Arid high desert — masonry thermal stress + nesting raptors.

Hot arid, monsoon rain — sudden thermal cycling damages crowns.

High-altitude cold winters — heavy wood-burning, deep creosote.

Cold mountain winters — wildfire-zone code + heavy creosote.

Severe winters — heaviest creosote loads in the country.

High plains cold + wind — chase-flashing failure common.

Front-range altitude wood-burning — strict EPA stove standards.

High desert + adobe construction — kiva fireplaces specialty service.

Brutal winters — most-extreme freeze-thaw masonry stress.

Cold winters, wide temp swings — clay liner failure common.