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Old 13-07-2016, 14:32   #16
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Re: Lagoon Hull - Deck movement

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Originally Posted by HighTemp View Post
A couple months back, I was approached by a Broker / Beneteau dealer to gauge my interest in a 2015 Sense 55 that was available and that had this issue. He stated that Beneteau had it repaired by factory techs and that all was well. Sounds as if this might not have been an isolated incident.
Sometimes I don't know what to think. Obviously its much cheaper to build boats that are glued together rather than introduce the high labor costs of nuts and bolts. When its been questioned in the past the naysayers all tell us how old fashion our thinking is as airplanes and cars are all held together with glue and its a much better solution than mechanical fasteners and adhesive together. I guess the people building cars and airplanes are either using different products or have a much higher level of quality control or both. The hull to deck joint on a mono hull is under a lot of stress when in a large seaway and some companies like HR and Amel go so far as to fiber glass the hull and deck together making them essentially a single component to ensure this area is completely bullet proof and could never leak or start opening up.
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Old 13-07-2016, 14:52   #17
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Re: Lagoon Hull - Deck movement

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Sometimes I don't know what to think. Obviously its much cheaper to build boats that are glued together rather than introduce the high labor costs of nuts and bolts. When its been questioned in the past the naysayers all tell us how old fashion our thinking is as airplanes and cars are all held together with glue and its a much better solution than mechanical fasteners and adhesive together. I guess the people building cars and airplanes are either using different products or have a much higher level of quality control or both. The hull to deck joint on a mono hull is under a lot of stress when in a large seaway and some companies like HR and Amel go so far as to fiber glass the hull and deck together making them essentially a single component to ensure this area is completely bullet proof and could never leak or start opening up.
Some monohull manufacturers, like Bristol, used to build the hull in two halves, allowing a fully encapsulated hull-deck joint. Just to make sure, they then through-bolted a 4" deep, 3" wide teak toerail, every few inches, right through the whole thing.

My Bristol is 32 years old this year, and there's never been a single drip from the joint. So it can be done properly, it just takes the builder to care.
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Old 13-07-2016, 15:55   #18
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Lagoon Hull - Deck movement

I believe IP uses 5200 to join the flanges, then installs a .25" bolt every six inches, then screws the teak cap rail on with the screws extending through the joint, and the screws holding the stanchions go through the joint so you end up with a faster through the joint every couple of inches.
I believe putting the bolts through the joint here is a permanent fix, I'd be surprised if it is a problem in the field if the new boats haven't incorporated this fix in manufacturing.

I think hull to deck joint leaks are not all that uncommon in monos too?


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