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• ."�,�V..�<1n_I !� <br /> , � �'' -t� / S �Cs 3 ' <br /> � """�0H• TECHNICAL/GENERAL iNFOkMATION LETTER No ; �n-�9z <br /> � Pltl�burOhComin Co�ntlon � September 29, 1983 <br /> P�honi��t�)32761�JOw, PlNsburph, PA 1b299 DATE � <br /> TC: Claes Block Sa1=s Representatives <br /> Hanufacturer's Representativee <br /> Regional Menagers <br /> SUBJECT: PC G1aesBlock� Units Usage in One Hour F1re Rated Wnlle <br /> Pittaburgh Cotning Corporation has received a number of inquiries regard- <br /> ing the use of glasa block masonry units in both ex[erior and interior <br /> fire resietive openings. Certain features of PC G1assBlock panele make <br /> them appropriate for euch uses. For example: <br /> (1) Moet atandard thickneea PC G1aeaBlock panels are claseified by <br /> Underwriters Laboratories for a 3/4-hour rating in openinge not <br /> exceeding 120 eq. ft. in area. <br /> (2) Both PC GlaseHlock panels and vired glaee are eubjected to the seme <br /> test to receive the 3/4-hour claesifica[ion, UL 9, "Fire Tebt of <br /> Windw Asaembliee". A one hour test doee aot exiet. <br /> (3) PC G1aesBlock panel as�embliee are conetructed of materiale which are <br /> incombuetible. • <br /> Wherever wired glase is allwed, the use of glase block maeonry units ie <br /> approprf.ate, but the final approval depends upon interpretation of the <br /> local building code by the code officials of [hat �uriediction. , <br /> Building codes differ acrosa the country. For example, the Uniform Building <br /> Code (UBC)� has a number of eectiona which could be interpreted to allow <br /> the use of glase block masonry uni[s in fire resietive openings. Theee <br /> , eectione of the UBC, taken from the 1982 Bdition, are duplicated in <br /> Attachment I. <br /> We are currPntly examining codes o[her than the UBC to eee what restric- <br /> tione may bc placed on glazed openinge in firE: rated va11A. For exemple <br /> the BOCA Basic Building Code2 presently reetricts [he i�•ae uf glass blocke <br /> in "Fire walle, perty walls, or. fire eeparetion walls". BOCA ha� r�:kiowl- <br /> edged by letter dated 9/27/83 that PC G1aesBlock unita with a 3�4 hour <br /> rating are acceptable for uee in fire eeparation walls �tiat have e fire <br /> reeietance rating of 1 hour or leae. Therefore, ve will be aeking BOCA to <br /> revlae the preeent code vording to remove the reetriction on .fire aeFnration <br /> valle. <br />