Roofing Nail Performance In Structural Flakeboards

Authors

  • E. L. Schaffer
  • T. L. Wilkinson
  • B. G. Heebink

Keywords:

Panels, plywood, flakeboard, fasteners, roof sheathing, nail withdrawal, durability, accelerated aging

Abstract

Phenolic structural flakeboard might be commonly used as roof and wall sheathing and as subfloor panels in housing. Important in the acceptability of such flakeboard as roof sheathing is the ability to hold the shingles in place. Failure of the roofing nails to perform this function is exhibited by nail "pop"—the slow natural withdrawal of a nail due to shrinkage and swelling of the panel and shingles. Such tendency of 1-inch roofing nails that had been driven into and through commercial and experimental flakeboards was compared with that in 5-ply exterior grade Douglas-fir plywood. Cyclic moisture conditions (including freeze-thaw) were generated employing an ASTM accelerated aging procedure. Nail pop was not evidenced in any of the panels. Rather, the nailheads were observed to subside further into shingle and panel surfaces with increasing exposure. This subsidence was highly correlated to the thickness swell of the panels. It can be concluded that nail pop will not be a problem with nails driven through the flakeboard.

References

American Society for Testing Materials. 1972. Evaluating the properties of wood-base fiber and particle panel materials. ASTM Standard D 1037, Philadelphia, PA.nGiese, H., and S. M. Henderson. 1947. The effectiveness of roofing nails for application of metal building sheets. Res. Bull. No. 355, Agric. Exp. Sta., Iowa State Coll.nHeebink B. G. 1974. Particleboards from lodgepole pine forest residue. USDA For. Serv. Res. Pap. FPL 221. Forest Prod. Lab., Madison, WI.nHeebink B. G., and F. V. Hefty. 1969. Treatment to reduce thickness swelling of phenolic bonded particleboard. For. Prod. J. 19(11):17-26.nLehmann, W. F., and R. L. Geimer. 1974. Properties of structural particleboards from Douglasfir forest residues. For. Prod. J. 24(10):17-25.nStern, E. G. 1950. Improved nails for building construction. Eng. Exp. Sta. Series No. 76, Virginia Polytechnic Inst.nStern, E. G. 1951. Nails and screws in wood assembly and construction. Wood Research Lab., Virginia Polytechnic Inst.nStern, E. G. 1954a. Effectiveness of nails vs. staples for fastening underlayment. Wood Research Lab., Virginia Polytechnic Inst.nStern, E. G. 1954b. Effectiveness of underlayment nails. Wood Research Lab., Virginia Polytechnic Inst.nSuddarth, S. K., and H. D. Angleton. 1956. Nail popping, a result of wood shrinkage. Station Bulletin 633, Purdue Agric. Exp. Sta., Lafayette, IN.n

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Published

2007-06-27

Issue

Number 3 / Fall 1980

Section

Research Contributions

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