Formstone. Perma-Stone. Rostone. By
whatever trade name, the mere mention of simulated masonry can cause a wide
range of reactions—from the rolling eyes of homeowners who want desperately to
be rid of it, to passionate defense by preservationists of 20th-century
building materials.
Perma-Stone is such a common trade
name that it’s almost become generic for any of the cement-like materials
applied to exterior walls and manipulated to look like stone. If you hail from
Baltimore and environs, though, the name you probably know is Formstone, which
native son and avant-garde film director John Waters called “the polyester of
brick.”
Patented by Baltimorean Albert
Knight in 1937 for his Lasting Products Company, its use was so widespread that
in 1997 Waters made it the subject of a 30-minute documentary film LittleCastles: A Formstone Phenomenon, told by the people who made it, sold it,
bought it, and installed it.
Coproducer Lillian Bowers (with
Skizz Cyzyk) says she got the idea for the documentary when she dreamed that
her father’s gravestone was being covered with Formstone.
Other brands included Rostone,
Tru-Stone, Fieldstone, Bermuda Stone, Modern Stone, Romanstone, Magnolia Stone,
Dixie Stone, and Silverstone. It was applied in a manner similar to stucco,
usually in multiple layers, to wire net or lath attached to existing exterior
walls, then scored with simulated mortar joints to suggest individual stones.
Adding to the illusion were often artful coloration and sometimes mica chips
that would sparkle on a sunny day.
Perma-Stone was registered as a
trademark in 1929 by a Columbus, Ohio, company of the same name, which trained
and authorized local dealers and provided them with the molds and materials
they needed to install it. Its immediate success spurred competitors to fill
the desire for a maintenance-free covering for poorly constructed exterior
walls.



























