Back to the Captain's Chair Repair

DonGarganoDonGargano Member Posts: 60
It's finally that time of year again up here in Ottawa, Canada.  Boat will go in the water some time in the next 5 to 10 days.  With gas at $1.90 a litre (3.7 litres to a gallon) now, I contemplated selling the boat, (a lot of people are doing that these days), but decided to hang on to it.  

I am re-visiting my Captain's chair project.  Was not really happy with the stability of the pedestal with the last repair, so I have removed the pedestal, the bolts, and the steel bars from under the floor.  

Instead of using marine plywood to build a base, I have opted to bolt a 1/8 inch, 12 x 16 aluminum plate to the floor.  Marine Plywood was going to cost me $300 for a 4 x 8 sheet (3/4 inch), without the mahogany veneer.  Then of course I'd have to apply fibreglass or some kind of waterproofing.  Getting the whole thing done professionally is going to run me a couple thousand not there mentally.  (yet!)

Here is the part where I ask for your opinions and recommendations.  

Obviously I do not have easy access to the underside of the floor.   

Do I attempt to cut a bigger hole in the floor and try to bolt the aluminum plate to the underside of the floor.  Or will bolting it to the topside of the floor suffice?   

I'm using stainless steel hardware, and will install the bolts/washers up through the floor, with a washer and nut on the top side.  Figured about 8 bolts would work.  Before I bolt the aluminum to the floor, I'd bolt the pedestal to the aluminum plate, using marine grade caulk/silicone to seal everything up. 

Thanks folks.



  • YYZRCYYZRC Georgian BayMember Posts: 3,691 ✭✭✭✭✭
    I would make a base out of 1/2” starboard rather than aluminum. 
    2008 350 EC on Georgian Bay
  • DonGarganoDonGargano Member Posts: 60
    So just a square of starboard bolted and/or glued to existing deck?
  • YYZRCYYZRC Georgian BayMember Posts: 3,691 ✭✭✭✭✭
    I assume the base of the seat is round? If so, I would make a starboard circle 12” wider in diameter than the seat base. I would bolt the seat base to the starboard and then bolt the starboard in place. 
    2008 350 EC on Georgian Bay
  • DonGarganoDonGargano Member Posts: 60
    OK, this sounds like a good solution. Hopefully I can find some Starboard material at one of our local marine supply stores. Since I cannot really get under the floor, how would you recommend I bolt the starboard material to the floor of the boat? I have seen some forums  mention using toggle bolts.
  • Handymans342Handymans342 Member Posts: 10,375 ✭✭✭✭✭
    I would use some 4200 caulk underneath and then some number 12 countersunk stainless screws into the fiberglass. 
  • YYZRCYYZRC Georgian BayMember Posts: 3,691 ✭✭✭✭✭
    I think toggles are a good route as there is a lot of torque on the seat bolts when you are in choppy water.  4200 is also a good suggestion to minimize water intrusion but it won't provide any real strength as nothing adheres to Starboard.
    2008 350 EC on Georgian Bay
  • DonGarganoDonGargano Member Posts: 60
    Took the boat in to a custom shop this morning.  Have decided to have the whole floor replaced.  Spongy in too many areas.  
  • LaReaLaRea Alexandria VirginiaMember Posts: 6,855 ✭✭✭✭✭
    Smart.  If the seat base failed in rough water, it would be a serious injury hazard. 
  • captkevincaptkevin ChicagoMember Posts: 64
    Probably good idea if you have soft spots
    2004 232
    2021 Yamaha Fx svho
Sign In or Register to comment.