18 ft fiberglass over wood transom repair, How many layers for tabing?

Questions about boat repairs with our resins and fiberglass: hull patches, transoms and stringers, foam, rot etc.
fallguy1000
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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by fallguy1000 » Sat Jun 29, 2019 8:25 pm

I wouldn't run an 80hp engine without four layers 1700 each side, but that's me.


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fallguy1000
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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by fallguy1000 » Sat Jun 29, 2019 8:26 pm

I wouldn't run an 80hp engine without four layers 1700 each side, but that's me.

Total ounces is what matters.
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1barracuda
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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by 1barracuda » Sun Jun 30, 2019 2:49 pm

Thank you, I think I will do that. Just to be safe.

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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by fallguy1000 » Sun Jun 30, 2019 5:46 pm

I wouldn't run it without four layers and plywood. the hardwood is unknown to me.
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1barracuda
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grinding the polyester resin of the plywood and getting ready for new plywood and tabbing.

Post by 1barracuda » Sun Jul 21, 2019 7:20 pm

So i tore my transom apart and it looks like they only had a 3/4 piece of plywood for the transom. I have peeled back the polyester resin over fiberglass cloth and the wood is perfect. So i am grinding all the polyester resin off and taking it down to wood. I ordered 13 yards of 17 oz biax and 3 gallons of epoxy resin and wood flour and hopefully will be cutting the transom plywood and installing this week as well as tabbing in the transom. It is a big job but it could be worse. I noticed their are no real solid stringers from the transom to the first rib and will have to tab some in. will try and post some pics tonite after i finish the grinding. I noticed how expensive shipping is from florida to the west coast. Kind of a draw between lower cost marine epoxy and what i would buy at the local boat shop with epoxy costing over $100 a gallon. Just gives me confidence using a product designed for its use. Would be nice if smaller businesses got the same shipping prices as Amazon. back to the grind literally. lol Thanks to all who have given their 2 cents to my transom repair. will post more as it transpires.

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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by fallguy1000 » Mon Jul 22, 2019 10:47 pm

For an 80hp engine; you'd be wise to add a 2nd layer of plywood.
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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by 1barracuda » Tue Jul 23, 2019 5:44 pm

I am adding 2 pieces of 3/4 inch plywood, for a total thickness of 2 1/4 inches. Is that what you mean?

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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by fallguy1000 » Tue Jul 23, 2019 5:47 pm

yup
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1barracuda
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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by 1barracuda » Wed Nov 06, 2019 2:16 pm

I basically gutted my whole boat and found no rot on the wood. If you look at the pictures you will see that the ribs are approximately 34 inches apart. The stringers are un enforced and they are 1.5 inches wide and 3/4 inches thick and run the length of the boat.
Just wondering how i would re enforce the bottom stringers and affix them to the transom. Any ideas would be greatly appreciated. I have already reinforced the transom by adding two 3/4 inch pieces that shore up the transom thickness to 2 1/4 inches. The bottom of the boat is plywood, the sides are strip pieces of wood. the outside has fiberglass cloth and the inside has fiberglass cloth. I am just wondering if i can put in sectional stringers between the ribs with 1/8th inch gaps bottom and ends to not create any hard spots and call it good. Thanks in advance Terry

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Re: 18 ft fiberglass over wood transom repair, How many layers for tabing?

Post by fallguy1000 » Fri Nov 08, 2019 5:36 am

Hard spots are not going to be an issue.

Rough up the surfaces you intend to shore up with 36-40 grit and use wood flour or cabosil/aerosil and epoxy to bond any additional woods.

Or, you can prep the same and shore with rolled up glass tapes.

I would not worry about hard spots; they cause trouble under expansion typically BH to hull or stringer to hull, but the stringer to transom connection is not generally a concern.
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