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ISANTA Clipped-Head Nail study
The following is from the Conclusions section of their study:
It should be noted that the results of these tests go against what common engineering
judgment would predict. Without further knowledge of the testing procedures and results,
we recommend using full round-head nails.
You may e-mail ISANTA at
Isanta@Ameritech.net or telephone them at (708) 482-8138 and request a copy
of the study, which is titled "Cyclic Tests of Casing and Clipped Head Nail Connections."
Researchers who tested clipped-head and casing nails at Virginia Polytechnic University
found that clipped-head nails perform just as well as full round-head nails. They tested
plywood specimens nailed to lumber and loaded in shear, which reflects how nails connecting
shear panels to wood framing would be loaded.
"...there is not a satistically significant difference between the clipped-head
and full-head nails, regardless of the orientation of the clipped edge with
respect to the load or plywood face-grain direction."
Thor Matteson, Structural Engineer
California License #S4097
Residential and Commercial Earthquake Retrofit Designs,
Structural Evaluations, & Related Engineering Services
Serving Central California
from Bakersfield/San Luis Obispo north to Sacramento/Santa Rosa
e-mail to thorm "at" sti.net
(209) 966-6644
PO Box 487, Mariposa, CA 95338