Southern Research Station

Title: Racking strength of walls sheathed with structual flakeboards made from southern species

Author: Price, E.W.; Gromala D.S.

Date: 1980

Source: Forest Products Journal 30(12):19-23

Description: Ten types of structural flakeboards and two types of southern pine plywood were evaluated. Racking loads were applied to full-size racking panels (8 by 8 ft., according to ASTME 72) and small panels (2 by 2 ft.). When subjected to a 1,600-pound racking load, 8- by 8-foot panels sheathed with flakeboards containing a mixture of hardwood and pine flakes were slightly stiffer than southern pine plywood (0.10-in. vs. 0.12-in. deflection). Yet, plywood-sheathed panels provided slightly higher strengths for the full-size racking test (6,000 lb. vs. 5,500 lb.). The highest average racking strength, 6,200 pounds, was obtained with the 1/2-inch yellow-poplar-sheathed panels. After a 24-hour water soak, small panel racking resistances and lateral nail strength decreased. The racking strength decrease ranged from 4 percent (5/8-in. oriented mixed high density) to 18 percent (1/2-in. oriented mixed low density). All panel types had racking strength reductions within limits allowed under current standards. The nail strength decrease ranged from 9 percent (518-in. random mixed high-density flakeboard) to 27 percent (1/2-in. southern pine plywood). Theoretical racking strengths (derived from a linear mathematical model based on lateral nail resistance) were close to, but consistently higher than, test values.

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Citation

Price, E.W.; Gromala D.S.  1980.  Racking strength of walls sheathed with structual flakeboards made from southern species.   Forest Products Journal 30(12):19-23