Nail/glue joints in wood

A study was conducted in which 86 laterally-loaded nail joints were tested to their ultimate load. Half of these joints also contained a commonly used elastomeric construction adhesive in conjunction with an 8d common wire nail (nail/glue). All joints were tested at a constant loading rate of 0.10 in./min. at least 30 days after fabrication. The results showed that the use of glue in conjunction with a nail greatly enhanced the load-carrying capacity of the connection. The average ratio of nail/glue to nail-only joint strength was approximately 3.7. This value is rational, given the mean strength of nail joints determined in this study (550 lb.) and assuming a unit adhesive bond strength (~ 250 psi) consistent with previous work by the author. Therefore, the superposition of nail and glue joint strengths appears to be a rational predictor of nail/glue joint capacity.

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