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post #1 of 5 Old 01-16-2003 Thread Starter
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Strengthening Hull sections?

Does anyone have ideas on potential problems of adding fiberglass layers to strengthen sections of the hull [that appear too thinly layed]?
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post #2 of 5 Old 01-16-2003
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Strengthening Hull sections?

I assuming you are talking about fairly large sections, generally that is not a terribly good idea as it takes a lot of layers to make a significant difference and the boat probably was not designed to withstand the increased loading of all of the weight. It is also difficult to get a proper secondary bond without a huge amount of work. I would sooner suggest that you glass in an internal framing system using epoxy and glass over foam stringers and athrwartships frames.

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post #3 of 5 Old 01-18-2003 Thread Starter
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Strengthening Hull sections?

There are some areas in the bow chain locker - on both the port and starboard side - that appear to be exceptionally thin (like paper thin) - as if the glass was stretched and separated in spots (?).

I''ve read a few chapters in various hull maintenance books that recommended using the stringer technique. I guess I''m a little worried about possible ruptures at the paper-thin spots - if there is any hull flexing at all.

Once of my concerns about applying 6x6 inch or 8x8" patches (layered of course, with the first 4 layers starting smaller and getting larger to the final 6x6 or 8x8 section applied) - is whether that would create a section that might be more prone to rupture - since it would be stiffer than the areas surrounding it - and again - the possible flexing of the hull in rough seas.

My boat is a 1971 Islander - hand layed glass - looks sturdy & well layed below the water line.
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post #4 of 5 Old 01-21-2003
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Strengthening Hull sections?

Given that the boat is now in its 32nd year, what is it that is causing you to doubt the strength of its hull?

How long have you owned the boat? What kind of use has it had over the years?

The hull is constructed of glass threads bonded together with plastic, both of which are translucent. In direct sunlight, light colored hulls transmit enough light to frighten some folks. In the early days of fiberglass construction, sellers of wooden boats used that as a sales technique to talk their prospective buyers out of switching to fiberglass.

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post #5 of 5 Old 01-22-2003 Thread Starter
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Strengthening Hull sections?

I believe the boat has been mostly used in calm conditions - and given my hope to a long cruise in the next year or so - I am looking at things to increase the safety of the boat.

The paper thin spots are troublesome - since there doesn''t appear to be any fiberglass fibers in those spots - just the bonding / lamenating agent (?)

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