| | Re: Advise needed for mounting seat pedestals on our boat
That 30" pedestal will have a lot of leverage on the deck. When I took apart my old 88 Four Winns, which had 2 pedestal seats up front but they were only about 11" high, I found that the deck itself was 1/2 ply but underneath that was a 3/4 in thick reinforcement for a total thickness of 1 1/4 " in that area. I used the same size wood screws to install the new pedestals but soaked the holes in CPES and bedded them in 3M 4200. They are very strong but I don't know if that would hold up under the leverage of a pedestal that is almost 3x as high, depending on the weight of the occupant. And on a boat that age, the chance of the deck being really solid, unless it was always stored inside, is not all that great.
1988 Four Winns 200 Horizon
4.3 OMC Cobra
1998 Jeep Grand Cherokee
4.0/NV 242 Selectrac
2007 Jeep Grand Cherokee Limited
5.7 HEMI/Quadradrive II