Brownstone is a type of sandtone rock, generally of Hummelstown brownstone origin in the historic Washington DC neighborhoods.  The word brownstone is often used to denote a type of building, but in most cases they are just late century rowhomes.

At the following link, you can learn a lot more about the history, causes of deterioration and restoration of historic brownstone.

Brownstone facade rowhome

An example of a historic brownstone masonry facade rowhome

This particular building is built with ashlar masonry.

See the following link for more information on sandstone rock and stone masonry.


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