Creep of Thick Structural Flakeboard in Constant and Cyclic Humidity

Creep tests were conducted on three-layer flakeboards with random core and aligned flakes and on plywood to determine the suitability of the thick flakeboard as roof decking for commercial and industrial buildings. Nominal 1-1/8 inch-thick specimens were loaded at the quarter points to simulate the maximum moment in the span produced by a 45 psf design load under constant (65 percent relative humidity (RH)) or cyclic (25 percent to 85 percent RH) humidity at 80?F for 90 days. Creep deflections under constant humidity were 44 to 69 percent of the initial deflections when corrected for differences in panel thickness. Creep deflections under cyclic humidity were 145 to 276 percent of initial deflections. For both conditions, creep deflections were least for the plywood specimens. Residual bending strength and stiffness after loading ranged from 74 to 99 percent of the values of control specimens and were approximately the same for the flakeboards and plywood.

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