Attaching seats etc. to floor

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wino

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Joined
Oct 2, 2005
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19181
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What do you use to attach seats to floor? Is there something to stick in a hole you drill to make the screw or bolt water tight ? I want to attach seat and gas tank frames to new floor but don't want water getting underneath.Is it just as easy to use silicone or are there special plugs for this type of job?

Thanx
 
Mark the hole locations, drill out to 1/2 inch, fill with epoxy. drill holes for screws, install screws with silicon caulk.

However you may want to thru-bolt them in which case drill screw holes all the way thru add fender washers underneath, seal screws with epoxy.
 
there are a couple ways to go, but thru bolting is much better than relying on wood screws. i'm assuming that the deck has a plywood backing in your application. there are large backing washers made with sharp metal tabs on them that are perfect for this type of application. they use machine screw thread. add some 5200 to the face of the washer to hold the washer in place if you have to remove the screw later on, it will keep it from falling off. a normal nut and washer will also work if you prefer, but you have to be able to get to the back of it each time to remove it.
 
Well I really can't get to the back as it is the floor and it is glued screwed and fiberglassed to stringers.
Boatrebuild128.jpg


I think there were some sort of rubber plugs in the holes to put the screws in.It is only half inch ply.

Thanx
 
quote:
Originally posted by wino

Well I really can't get to the back as it is the floor and it is glued screwed and fiberglassed to stringers.
Boatrebuild128.jpg


I think there were some sort of rubber plugs in the holes to put the screws in.It is only half inch ply.

Thanx

Click to expand...


You can get stainless steel toggle bolts made for this purpose from many marine suppliers. These will provide a secure fastening but you'll still have to seal the holes to make them waterproof.
 
Many will insert one of those 6" round hatches in the deck, under the seat. This allows you to get a hand on the underside, so that you can through-bolt. I would never trust a seat attached with screws, esp. if the plywood is 0.5" thick. Screws -will- fail, the only question is, "when".
 
Oh OK my mistake here.I am wanting to attach my seat frames to floor, basically rectangular boxes which will have the seats attached on top of.The boxes cover the fuel tanks and used to have lounge seats but I am putting single seats facing front and back after rebuilding frames.Now I know to bolt my seats to the top of frames for sure.

Thanx
 
West Marine and others sell threaded fasteners that are a barrel shaped thing with wood screw threads on the outside and machine screw threads on the inside, they are for attaching things to wood decks without having to put in a wood screw and causing rot...you drill a proper size hole, then seal it with epoxy...then install the insert and use 3m 4200 to seal it around the wood screw threads. I used these to install the rear seats in the deck of my 88 FW when we replaced the deck and it works well in that they are strong...can be installed with no access to the back side and you can remove the seats (machine screw) without disturbing the inserts. They are expensive but worth it...
 
quote:
Originally posted by wino

Oh OK my mistake here.I am wanting to attach my seat frames to floor, basically rectangular boxes which will have the seats attached on top of.The boxes cover the fuel tanks and used to have lounge seats but I am putting single seats facing front and back after rebuilding frames.Now I know to bolt my seats to the top of frames for sure.

Thanx

Click to expand...


Yes, that is an entirely different situation than your first post would indicate. I suspect most folks (including myself) picured seats on pedestals.

Inserts should work or since it will be under the frame and out of sight, an access hole can be cut as suggested above and the frame can be through bolted. If you make an access hole, "T" nuts inserted from underneath will also work.
 
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