Document 97zjRRaQoxgw4N5QGJXOmG4R

PITTSBURGH TESTING LABORATORY 3120 SOUTH 20th STREET - PHILADELPHIA 45, PA. A9 A MUTUAL PROTECTION TO CLIENTS. THE PUBLIC AND OURSELVES, ALL REPORTS ARE SUBMITTED AS THE CONFIDENTIAL PROPERTY OF CLIENTS, ANO AUTHORIZATION FOR PUBLICATION OF STATEMENTS. CONCLUSIONS OR EXTRACTS FROM OR REGARDING OUR REPORTS 19 RESERVED PENDING OUR WRITTEN APPROVAL. REPORT YOUR: G-1269 DESCRIPTION - Witnessing Tests of Sheathing Material for Resistance to Racking Under Dry and Wet Conditions on 48" Wide, Square Edge, one-half inch thick, Bestwall Gypsum Sheathing AT - Bestwall Gypsum Company, Paoli, Penna. REPORTED TO - Bestwall Gypsum Company, Paoli, Penna. December 28, 1959. On December 21 and 23, 1959, we visited the Bestwall Gypsum Company at Paoli, Pennsylvania to witness Wet and Dry Racking Tests on the above material. Test panels, prior to testing, were inspected by us and found to conform with Technical Circular No. 12, Underwriting Division, F. H. A. , Washington, D. C. Test frames were assembled with double end studs which were fastened together with 10 D common nails. Studs were nailed to sole plates with 16 D common nails. Top sole plate was nailed to the top plate with 10 D common nails. No. 1 construction grade wood was used. Nail spacing on test frames was as follows: 4" on edges, 8" in center. Calvanized roofing nails with a 3/8" to 7/16" head - 1-3/4" long - #11 gage were used. Racking Tests were made in conformance with A. S. T. M. E72-55. The Dry Series Tests, composing three test panels, were made on December 21, 1959. Deflection was measured with mirror gages. Mirror gage distance was seven feet. Results of Dry Tests are as follows: Test Panel Total Load, Lbs. At Load of 1200 lbs. Ave. Total Residual Deflection Deflection No. No. No. 1 2 3 7400 7400 8200 . 08 07 . 05 . 00 . 02 . 03 At Load of 2400 lbs. Ave. Total Residual Deflection Deflection . 16 . 31 . 25 . 07 . 09 . 03 Ave. of 3 tests 7666 . 066 . 017 . 240 . 063 REMARKS: Load was applied to test panels in increments of 400 lbs. (1 of 2) SGP 0025733 Bestwall Gypsum Company OUR: PH - 5 7 o 6 YOUR: G-1269 December 28, 1959 The Wet Series Tests, composing three test panels, were made on December 23, 1959. Deflection was measured with mirror gages. Mirror gage distance was seven feet. Results of Wet Tests are as follows: Test Panel T otal Load, Lbs. At Load of 1200 Lbs. Ave. Total Residual Deflection Deflection No. 1 No. 2 No. 3 Ave. of 3 tests 5600 5000 5000 5200 . 09 . 10 . 09 . 093 . 00 . 02 . 00 . 007 At Load of 2400 Lbs. Ave. Total Residual Deflection Deflectio . 27 . 35 . 22 . 280 . 10 . 11 . 08 . 097 Remarks: Load was applied to test panels in increments of 400 lbs. Panels exceeded the requirements for Racking Strength without diagonal corner bracing as specified in Technical Circular No. 12 titled "A Standard for Testing Sheathing Materials for Resistance to Racking. " J. Connelly, Inspector. PITTSBURGH TESTING, LABORATORY Mana^ei/ Philadelphia District RJVuypillat (2 of 2) SGP 0025734