How 1920s shingle types and designs created the golden age of composition roofing.
By the 1940s, color was as important as
shape in marketing asphalt shingles. Regional manufacturers
might come up with signature designs, such as this Arabesque
pattern (inset left). The rhomboid tab, often called dragon’s
tooth today, dates to at least 1945 (inset right) and lent
itself well to multicolor effects (top).
Photo Courtesy of Barbara Krankenhaus
At the turn of the 20th century, when man-made building materials
really began to take hold, manufacturers combined production innovations
and marketing flair to produce a new kind of roofing generally called
composition shingles: fibers of some sort saturated or mixed with
a binder. Taking off in the building boom of the 1920s, these asphalt
shingles were highly popular, not only for their ease of installation,
and resistance to fire, but also for their astounding variety of
novel shapes and colors—creativity that might cinch the sale
of a house in a highly competitive market. Since many of these shingles
styles are in limited production today (if made at all), understanding
the basic asphalt shingles available in our grandparents’
era is the place to begin for anyone who faces a composition shingle
Before we look at the birth of the asphalt shingle, let’s
step back to the 19th century to get a handle, if you will, on the
pre-history of the composition roof. In the 1840s there was a ripe
market for new roofing materials to build the growing towns of the
Midwest and West Coast. Corrugated iron was the most promising innovation,
however a few experimenters were taking another route by saturating
layers of felt, paper, or flax with fish oil or pine tar, then covering
this concoction with sand or ground shells.
Samuel and Cyrus Warren of Cincinnati were two of these pioneers
who revolutionized this process in 1847. They found that coal tar—a
waste product of the gas lighting industry—made an ideal adhesive
for what we now call built-up roofs. Not to be overlooked was the
fact that the gas companies would actually pay to have the stuff
taken away. The brothers soon had a thriving business manufacturing
and installing their roofing in Chicago, St. Louis, and Philadelphia.
Other leaders in the industry were Samuel Barrett of Chicago and
Michael Ehret of Philadelphia. In 1868, Ehret patented the slag
(or cinder) roofing system, which used this material as a top coating.
Coal tar was a big boon to composition roofing, but as the gas companies
found it had other uses in the nascent chemical industry, they started
charging for it. Naturally occurring asphalt, the obvious alternative,
had been tried for waterproofing roofs in the early 19th century,
and by the 1880s large quantities were being imported from the Pitch
Lake in Trinidad. However, it took the first oil well in Pennsylvania
in 1859, and the subsequent growth of the petroleum industry, to
make asphalt plentiful enough.
By 1889, composition roofing was a well-established contracting
business. After 1900, one could buy essentially the same roofing
coated with granulated stone from suppliers as common as Sears,
Roebuck and Co.—the ubiquitous roll roofing that protects
barns, garages, and industrial buildings.
The idea of shaping asphalt roofing into individual shingles is
credited to Henry M. Reynolds of Grand Rapids, Michigan in 1903.
A roofing contractor and manufacturer, he started cutting stone-surfaced
roofing into 8" x 16" shingles—by hand, with a knife.
Adding crushed granules of slate—a 1914 idea from F.C Overby
of the Flintkote Company—helped weight such shingles down
to the roof. From here a new industry seems to have sprung. A big
help was a push by the National Board of Fire Underwriters to eliminate
wood shingle roofs, starting around 1911. World War I was a boost
too because asphalt shingles made use of non-strategic materials.
It was not until about 1915, however, that manufacturers perfected
the machinery for roller-die cutting thick roofing into irregular
shapes on a continuous production line, thereby opening a cornucopia
of asphalt shingle products to the market.
By the late 1920s, the bulk of asphalt shingles on the market were
not strip types, as they are now, but individual shingles (a regional
specialty at best for most of today’s manufacturers). Individual
shingles were not only the most logical product to make when processing
large rolls into smaller forms, they were economical and easy to
install. Many types of individual asphalt shingles found a ready
market for over-roofing existing roofs, such as wood shingles.
Individual rectangular shingles as large as 12" by 16"
were often distinguished from standard or unit shingles, though
each manufacturer had their own distinctions and terminology—Jumbo
or Massive, for example. Produced in a variety of shapes—some
designed to speed installation—and colors, such as brown,
Spanish red, maroon, green, grey, black, and purple, they could
be selected for a monochrome roof or combined for a “blended”
effect. Giant shingles were installed in either the American method
(where shingles overlap conventionally at their bottoms), or the
Dutch lap method (where shingles lap to one side). At least one
manufacturer offered them in mixed lengths that created the random
exposures evocative of shake or thatch roofs.
French Method Shingles—
Asphalt shingles cut in a diamond or hex pattern, reminiscent of
the chateau roofs of the Loire Valley, were often called French
Method shingles and very popular. These shingles came in two common
sizes—12" x 12" and 16" x 16" —often
incorporating tabs or clips at the bottom corner to guard against
wind lift. Colors tended to be stone tones of red, blue-black, green,
and grey. A few companies tried coloring slate and gravel by 1919,
but success was limited and the natural stone proved most durable.
Because they only overlapped at shingle perimeters, asphalt French
Method shingles provided just a single-coverage roof—that
is, only one layer of roof material. This single thickness of asphalt
was not always acceptable for new construction, but worked fine
for over-roofing. Not content to clone a continental pattern, many
manufacturers came up with their own spin on the French Method pattern
by clipping the corners into a hex, or deforming the diamond slightly.
—Practical as they were, the large, exposed edges of individual
shingles made of a flexible asphalt-and-felt base made them prone
to wind-lift and subsequent breakage in storms or areas of the country
with windy climates. Finding inspiration in a potential problem,
manufacturers surmounted the wind-lift issue by conniving patterns
to completely interlock the shingles.
With tabs and ears that slid into slots created in the previous
course, interlocking shingles were mechanically similar to a self-sealing
cereal box top. The industry evolved two general designs: long,
uncut tabs (sometimes called T-lock, after the appearance of the
shingle) and short, slitted ears. Besides creating an integral roof
with decorative course lines much like a basket or quilt, interlocking
shingles had the advantage of double coverage.
Though evidence of interlocking shingles is murky in the early 1920s,
by 1929 these products are common in building product ads. They
remain practical and popular to this day in high-wind prone regions
of the country. Surprisingly, they also seem to have been well adapted
to covering the rolled eaves used to evoke thatched roofs on many
cottage-style houses of the 1930s and ‘40s.
Moving beyond true individual shingles, there once was also a whole
class of strip shingles that came close to individual shingles in
effect. Like decorative ceramic floor tile or paving bricks, their
irregular, but mundane-looking, tabs belied clever patterns produced
once the shingles overlapped on the roof.
Most popular were hex shapes, especially in two-tab strips. Appropriate
for both new construction and reroofing, these strips were common
in two sizes: Standard and Giant—the latter with a 13 1/2"
Modified octagons in four strips were also marketed. Besides the
interesting roof pattern, octagons could create a fiesta look by
laying alternate strips in different colors. Octagonal strips were
also appealing due to their small butts, which worked well around
dormers and other angled areas.
The novelty strip concept could even be stretched to include Arabesque
patterns, such as the Nelson Master Slab and Continental Artstrip,
particularly popular after 1930. Ceramic granules, perfected in
the 1930s, increased the color possibilities. By piling multiple
colors of mineral on a single strip, manufacturers could produce
a “tapestry” effect, more variegated than any natural
roofing material could ever be.
As the 1940s dawned, there were even “broad shadow”
strip shingles on the market, manufactured with early versions of
the rhombus-shaped dragons’ tooth tab so ubiquitous today
for textured architectural asphalt roofing products. Some shingles
were even developed with specific house styles in mind. Whatever
their purpose, their contribution to the architecture and historic
character of a building is no less significant than the siding design
or paint color. Though many of these products fell out of favor
through the 1950s and 1960s, their delightful variety is starting
to bring eye-appeal back again to asphalt roof shingles of the 21st