On my Bertram 20, I am ready to install the helm and companion seats. The pedestal bases would typically be through bolted to a backing plate under the sole.
With the closed cell foam and the fact that the seat bases were an original and notorious source of water intrusion I do not want to repeat.
THe pedestals have a 9" Diameter. I was thinking of making a 15" diameter "pad" to mount them on.
Would it be sufficient to make a pad with 3/4" coosa or even just ply have these tee nuts secured with the proper hole pattern into the bottom of the pad, then plexus the whole thing to the sole.
Thanks in advance.
Ian.