Associations

The National Roofing Contractors Association (NRCA) is one of the construction industry’s most respected trade associations and the voice and leading authority in the roofing industry for information, education, technology and advocacy.

Think of 4specs as a free online architectural library service Target Audience: Commercial and Institutional Architects, Engineers and Specifiers

historical restoration

HistoricPreservation.com is an invitation-only, human-curated, online marketplace and specification platform comprised of and developed for buyers, sellers, and specifiers of high quality Historic Preservation and Restoration related products and services.

metal

The site covers metal construction products using all types of substrates: steel, copper, aluminum, zinc, stainless steel, Corten, Terne, Galvalume, Zincalume, galvanized, tin and more. Environmental (green) issues, such as sustainability and cool initiatives, are also covered.

The Slate Roofing Contractors Association of North America, Inc., was originally formed as an unincorporated association in Pennsylvania in March of 2005. The SRCA incorporated as a non-profit trade association on January 1, 2008 as the Slate Roofing Contractors Association of North America, Inc.

nsa logo

The National Slate Association was first established in 1922 by producers of slate material. The goal was to promote the use of slate for roofing and structural applications.