Northeastern US

Historic stone + brick stock — strict historic-district rules.

Severe winters, dense urban brick — heavy code enforcement.

Humid continental + coastal salt erosion.

Cold, snowy — old colonial masonry stock.

Coastal — historic stone chimneys + salt-air erosion.

Severe winters + colonial-era stone chimneys (oldest stock in US).

Heavy wood-burning, severe winters — heaviest creosote.

Granite-state masonry + heavy wood-burning.

Long, severe winters — wood is primary heat source for many homes.