pull out strength of nails in plywood

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Professor Poo Chow, a researcher at the University of Illinois, studied the withdrawal and head pull-through performance of nails and staples in plywood, waferboard and osb. Allowable withdrawal load or force for a common nail or spike driven into side grain perpendicular to the fibers of seasoned wood (or wet unseasoned wood) can be estimated as. Box nails resemble common nails but are thinner to keep the wood from splitting when driven. Interesting comments. Smooth shank nails offer the least pull-out resistance when compared with spiral and ring shanks. This 3-inch on center nail spacing increases the strength of the holding power of the nails and the plywood. They are inexpensive but after several years they have a tendency to loosen up and begin to pull out as the plywood shrinks. Screws may be a waste of time compared to ring shank nails but it's hard to deny that screws have much better pull-out strength than nails. Many times they are … I would like to see info on the pull-through strength for tapered screw heads and plywood. 6.7 Deck Material. Smooth Shank. F = allowable withdrawal load or force per inch of penetration (lb/in). OSB/Plywood 0.5 340 390 173 Withdrawal (Pull-out) Capacities (pounds per inch of thread penetration) Assumptions:-Tabulated values above based on American Wood Council, NDS 2005 Table 11.2A-Information for reference only. A single fastener with 522 kg (1150 lb) pull-out strength would cover the uplift force but clearly would not be sufficiently distributed throughout the sheet. Holding Strength Of Nails Nails are not normally used in furniture construction as structural load bearing fasteners in areas of high stress, but rather they are most often used to hold other types of joints such as dowel joints together until the glue dries. They are best used when nailing solid wood boards and not plywood. For gosh sakes, shear strength isn't the issue, except perhaps for earthquakes. where . Engineer of Record shall be consulted for actual design. (c) 5-ply applies to plywood with 5 or more layers; for 5-ply/3-layer plywood, use values for 4-ply plywood. My response to that would be yes, if the screws used have sufficient achorage values into the plywood to resist uplift at the PV system anchorage points. A spiral "thread" on the shank causes the nail to spin during installation, creating a thread-like interlock with the wood, which increases withdrawal capacity. "screw" anchors into plywood and rely on the withdrawal values of "nails" at the framing members below into which the plywood is anchored. Spiral Shank. F = 1380 SG 5/2 D (1) . With this nailing pattern and using 8-penny nails and 15/32"-inch thick plywood, it would require 490 pounds per square foot of pressure to pull the plywood from the wood wall studs. (d) Strength axis is defined as the axis parallel to the face and back orientation of the grain (veneer), which is generally the long panel direction, unless otherwise marked. If the earthquake forces exceeds the strength of the plywood-lets say the plywood is nailed to resist 10,000# of force-and that plywood tries to resist 15,000# of force, you will get nail pull out … In most cases the distribution of fasteners takes precedence over pull-out strength. Fastener requirements are … Tests were carried out to determine the holding strength of screws in the face and edges of plywood and oriented strandboard (OSB). Chow found that in both dry and 6-cycle aged tests: osb and waferboard performed equal to or better than CD-grade plywood. SG = specific gravity of oven dry wood D = diameter of nail or spike (inches) The nails and the plywood 5-ply applies to plywood with 5 or more layers ; 5-ply/3-layer. 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