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Natural weakening in deck under stanchion bases #18825
06/15/21 03:05 AM
06/15/21 03:05 AM
Joined: May 2020
Posts: 26
Seward, AK
P
Patrick Stinson Offline OP
Senior Member
Patrick Stinson  Offline OP
Senior Member
P
Joined: May 2020
Posts: 26
Seward, AK
The deck around many of my lifeline stanchion bases looks like it's weakened. The deck moves when I push and pull hard on the stancions. There isn't any fiberglass cracking that I can see, but the deck just seems to have lost its rigidity. Is this normal wear and tear for a 40 year (#354) J/30? What have others done to repair/improve it? Extra glass? Extra large backing plates?

Wet core is not a factor with these bolt hole placements.

I have read every post here with the word "stanchions" in it.


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Re: Natural weakening in deck under stanchion bases [Re: Patrick Stinson] #18839
06/22/21 05:46 PM
06/22/21 05:46 PM
Joined: Jan 2013
Posts: 60
Westerly, RI
Chris623 Offline
Senior Member
Chris623  Offline
Senior Member
Joined: Jan 2013
Posts: 60
Westerly, RI
Like many boats, #357 had this same issue before I purchased her. The PO had Waterline Systems address this by using a top side G10 stiffener plate that spread the load out. Over the years however, there was water infiltration from a path formed between the top and bottom skins in that area in your picture which has no core. This path caused wet core near a couple of these stanchion bases which I later repaired by recoring from the top, then applying AwlGrip & Griptex. This improved the stability of the stanchions. In your case, I would be curious if there was any wet core in that area or delamination, which you might detect with a moisture meter, hammer and maybe a core drill sample from the bottom side. If it turns out to be sound and dry, you might be able to restore some structure with a G10 plate glassed onto the bottom skin.

GL,

-Chris

Attached Files
StanchionBase.JPG [17.7 KBytes] - (9 downloads)
Re: Natural weakening in deck under stanchion bases [Re: Chris623] #18840
06/22/21 05:59 PM
06/22/21 05:59 PM
Joined: May 2020
Posts: 26
Seward, AK
P
Patrick Stinson Offline OP
Senior Member
Patrick Stinson  Offline OP
Senior Member
P
Joined: May 2020
Posts: 26
Seward, AK
The core was good, though I didn't follow what you meant about how water could get into the core since these stanchions don't penetrate the core there. At any rate, I added a fix that is similar in concept to yours except by reenforcing with plywood and new glass. (Photo is pre-sand and gelcoat, of course ;))

We'll see how that works.

[Linked Image]
[Linked Image]

Attached Files
IMG_4181.jpg [47.11 KBytes] - (8 downloads)
IMG_4182.jpg [95.83 KBytes] - (6 downloads)
Last edited by Patrick Stinson; 06/22/21 06:00 PM.
Re: Natural weakening in deck under stanchion bases [Re: Patrick Stinson] #18857
07/20/21 08:22 PM
07/20/21 08:22 PM
Joined: May 2007
Posts: 266
Miami, Florida USA
the redhead Offline
Senior Member
the redhead  Offline
Senior Member
Joined: May 2007
Posts: 266
Miami, Florida USA
Hi, I had similar so when I replaced my stanchions I used G10 for backing. Used the same size as the original backing plates.... but G10 is far stonger than anything else. You can get it a Grainger. Its fiberglass pressed in high tensile strength for insulation? Commercial applications. Must be cut by a shop saw and drilled... none of my hand tools would get thru it.


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