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Associations & Memberships


C-Thru's Associations & Memberships

C-Thru's engineering plans are approved by the International Code Council (ICC, formerly the ICBO).

C-Thru was one of the original members of the National Sunroom Association (NSA) with a seat on the Board of Directors. 61 C-Thru Sunrooms were nominated for awards in 2006, with 13 finalists and 1 winner.

C-Thru was one of the founding members of the National Patio Enclosure Association the first industry trade association and responsible for most of the code development and policing its own industry (formerly WAA).

C-Thru's window systems conform to the standards set forth by the American Architectural Manufacturers Association (AAMA).

C-Thru's patented electrical raceways are approved & classified with Underwriters Laboratories (UL).


C-Thru's windows are approved by the California Model Building Security Ordinance Association, which has the strictest set of standards for window security in the U.S.A.

 Florida Approval

Why Florida? Florida has the most stringent hurricane requirements in the U.S.A., and C-Thru's rooms are approved. C-Thru Sunrooms are approved in Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North, Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, and Wisconsin. Wyoming

All C-Thru windows and doors were tested and approved through the strict requirements  of  the National Fenestration Ratting Counsel (NFRC).
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