23 sites in Specifications
ARCAT
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Library of manufacturer's specifications and CAD details; directory of building products and manufacturers. Free downloads, sponsored by vendors.
http://www.arcat.com
Construction Criteria Base
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Documents used in building design and construction, including guide specifications, manuals, handbooks, regulations, and reference standards. Drawn from U.S. Federal agencies and private sources, a limited number of these documents are free to "guest" users.
https://www.ccb.org/html/home.html/
Sweets
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Building products catalogue includes product specifications, CAD Libraries, Manufacturer's Rep listings, and instant RFI service.
http://www.sweets.com/
See also