Page 645 - Handbook of Thermal Analysis of Construction Materials

612 Chapter 15 - Roofing Materials

In 1993 and 2000, the commercial low-slope roofing market in the
USA consisted of:

Type 1993 [2] 2000 [3]
New New
construction Re-roofing construction Re-roofing

Built-up roofing 29.0% 31.0% 22.4% 27.8%
Single ply roofing 38.8% 33.3% 38.1% 33.6%
Modified bitumen 17.0% 21.7% 19.1% 23.8%
Metal 3.5% 1.6% 4.3% 2.5%
Other types * 11.7% 12.4% 16.1% 12.3%

*
Other types = tiles, PUF, liquid-applied, asphalt shingles, metal

[3]
The NRCA’s 2000–2001 Annual Market Survey reported that in
2000, the low-slope roofing market accounted for 64.1% of the total roofing
market, a slight decrease from 68.7% in 1999. The roofing contractors
predicted that the low-slope roofing market would be 63.3% in the year 2001.
Most types of roofing materials are bituminous and synthetic
(polymeric) roofing membranes. The most commonly used roofing and
waterproofing membrane is made by combining asphalt or coal tar pitch
(bitumen) with felts or mats, or fabrics of organic or inorganic fibers.

2.0 BITUMINOUS ROOFING MATERIAL

The built-up roof membrane consists of bitumen, reinforced with
roofing felts, and aggregates which protect the bitumen from the UV
radiation and oxidation. Bituminous materials have been used since 3500
BC. Because of their waterproofing, preservative, and binder characteris-
tics, they were utilized by the ancients for the construction of houses and
[4]
roads. Bituminous materials were also used by ancient civilizations such
as Egyptians for construction, mummification, waterproofing, preserva-
tives, and binders.