Northeastern US

Historic stone and brick stock, held to strict historic-district rules.

Severe winters and dense urban brick, under heavy code enforcement.

Humid continental + coastal salt erosion.

Cold, snowy — old colonial masonry stock.

Coastal — historic stone chimneys + salt-air erosion.

Severe winters and colonial-era stone chimneys — the oldest stock in the US.

Heavy wood-burning, severe winters — heaviest creosote.

Granite-state masonry + heavy wood-burning.

Long, severe winters, where wood remains the primary heat source for many homes.