I am working on a project where the architect wants to "nail" five 10x10 timber columns together to create a large, wide column element. The AITC manual does not provide any criteria for the spacing of spikes other than to not split the wood and information about the drill size for pilot holes. I am specifying 1/2" diameter spikes at 6" o.c. with the spikes in each "layer" staggered 3". Just curious if anyone has any rules of thumb picked up in the timber framing world that might be helpful. Thanks.
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