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Old 04-11-2006, 08:25 PM
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Default How do I replace the wood under the floor of my fiberglass boat?

I have rotten wood under the floor of my 15' Larson ski boat. It has rotted, and I need to replace it. Is there a web site to tell me the procedure, or can someone let me know what to do?
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Old 04-11-2006, 08:39 PM
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Default Re: How do I replace the wood under the floor of my fiberglass boat?

Welcome to THT. I wonder what percentage of our long time members first came here looking for answers to a boat problem . . . anyway, thats another subject.

It depends to a large degree what style of boat and how hard is it to get to the rotted areas but basically you remove everything from the interior, determine the extent of the problem, cut out the bad stuff, replace with good stuff, put the boat back together. The devil is in what you find below the rotten deck and how much of that needs fixing like water saturated floatation foam, rotten stringers, corroded gas tank, oops, looks like the transom is squishy too!

I can't count the number of boats sitting around that have been torn apart to fix decks that are still torn apart because the job turned into something far beyond the value of the boat.

In other words, I'd be working on a plan B as well.
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Old 04-11-2006, 10:50 PM
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Default Re: How do I replace the wood under the floor of my fiberglass boat?

Welcome to THT. To get the rotted wood out, you simply cut the floor out with a skill saw until all the rotten wood is removed. Then you get to learn a little about fiberglassing and a few other things that will make you proud of your "project" boat.
You can take a look at this site: www . classicmako . com. THe guys over there are really into cutting everything out of the inside of their boats and making a custom layout on the rebuild.
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Old 04-12-2006, 12:07 AM
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Default RE: How do I replace the wood under the floor of my fiberglass boat?

It is usually a much larger job that you think,I pulled the floor on a 17footer that I had,
found out it had bad stringers, and spent the next 3 months putting it back together.

6 hours to rip apart ,3months to repair,turned out to be a great boat, but make sure your in for the long haul.
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hey Chaps, what is the mpg on your honda 90?

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Old 04-12-2006, 01:06 AM
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Default Re: How do I replace the wood under the floor of my fiberglass boat?

spearit - It's something ridiculous like 6 or 7 but I'm not a hard charger. I run a low pitch prop because I do quite a bit of towing. The other benefit of the prop is that when cruising the boat comes up on plane quickly and stays there easily at low RPM. I rarely have to get anywhere fast so I bop along at about 18 knots, the engine is barely working up a sweat and I end up going forever on a fill-up. It's grumpy old guy style boating. Oh, and the wife says I'm cheap so I guess all the stars are in proper alignment afterall.

Sorry mpetty, what just happened is your thread got temporarily hijacked
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Old 04-12-2006, 01:28 AM
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Default Re: How do I replace the wood under the floor of my fiberglass boat?

Tap plastics has some very good books on boat building and repairs.
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Old 04-12-2006, 07:33 AM
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Default RE: How do I replace the wood under the floor of my fiberglass boat?

You can also go to www.westsystem.com for some information on repair tactics. I think for around $3 you can order their repair manuals, which cover a lot about repairing, replacing, and fabricating new decks and stringers. Of course they want you to use their repair products, and a lot of people swear by their product, but either way it's a good read and worth the $3 in my opinion. Good Luck-

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Old 04-12-2006, 08:47 AM
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Default RE: How do I replace the wood under the floor of my fiberglass boat?

A tip to get you started before you cut on a 90 degree angle, put the saw blade on a 45 degree angle and cut out the bad wood. That way when you drop in the new floor (glassed both side) it will have a lip to sit on and make the repair easier and more solid. Post a pic once you cut the floor out and more help will follow.
Good luck and do not be scared to walk away if it is too far gone and not worth the effort.
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Old 04-12-2006, 10:28 AM
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Default Re: How do I replace the wood under the floor of my fiberglass boat?

Try Runabout Renovation...or was it Runabout Restoration? I forget...but it's a neat little book detailing exactly what you're doing...lots of pictures, diagrams and food for thought items...it might just be worth the price of admission...

http://www.amazon.com/gp/product/007...lance&n=283155

Here's the link to the book on Amazon...you could also try your library...that's where I first say the book...
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Old 05-17-2010, 06:16 PM
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Default cut it out

cut out the rotten area, that's supposed to stop the rest of the wood of rotting.
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Old 05-17-2010, 06:22 PM
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Will your new floor be carpet or glass? While I dont like carpet it will cover many sins. I have done this a few times. How much rot? Is there rot on the edges or mostly in the middle?
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Old 05-17-2010, 08:08 PM
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Lots of good information---perticularly about what else you may find once the floor is off. I personally prefer one of the thin blade saws--like the Fein Multimaster (there are cheaper equivilants like the Dremel or even at Harbor Freight)--These will also allow you to cut closer to the edge of the hull, and at the 45 degree bevel.

You have a choice of putting back in plywood (marine is best--not only coated and sealed with epoxy, but also with glass cloth on the upper side). Marine has miminal if any voids. There are other plywoods with exterior glue, but the voids are where the water sits and starts rot. Also when ever you put in any holes, be sure and seal them with epoxy--or better yet, over drill, fill with thickened epoxy and then drill pilot hole so screw is only into epoxy solids.

There are other flooring materials of synthetic nature--which will not rot, and may be lighter (and maybe slightly more expensive--I redid a floor in Nadi Core--and it was about the same cost as Marine ply.)
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