Single Ply vs. 2-Ply Laminated Tension Values

Describes experimentation to determine the comparative ultimate tension values of single ply vs. 2-ply laminated lumber. Douglas-fir laminating stock was selected from grades K, L-1, L-2, and L-3 in 2 inch by 6 inch by 16 foot dimensions. After resawing into two plies 11/16 inch thick, plies with comparable deflections were paired and laminated with a phenol-resorcinol exterior adhesive. Tensile testing was performed on a horizontal device capable of pulling apart 16 foot long members. It was shown that the ultimate tension values of 2-ply laminated members are increased from 8 to 366 percent over single ply specimens. It was also shown that the 2-ply lower laminating grades show a more pronounced increase in tension values than do the single ply grades.

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