[Public-List] Strengthening Soft Bulkheads.

Fri Jan 29 07:28:23 PST 2016

No, alas it¹s not that simple.  SURPRISE is an apres #400 boat, so there¹s
no metal trim band and she¹s got the moulded in toe rail/mini bulwark
sectioned joint.  The trouble is a combination of decayed bedding in the
hull to deck joint itself, years of sail track bolts working, and unbedded
cap rails over it all which have become very thin due to decades of
aggressive sanding.

Thanks Americo...

G

On 2016-01-29, 10:22 AM, "Americo" <picomar1957 at gmail.com> wrote:

> Hi concerning your deck to hull leaks it may be caused by the lack of sealant
> on the stainless trim
> I took mine off and there was no sealant at all easy for water to get in
> 
> From: Gordon Laco via Public-List <mailto:public-list at lists.alberg30.org>
> Sent: 1/29/2016 9:28 AM
> To: Jonathan Bresler <mailto:262alberg30 at gmail.com> ; Alberg 30 Public List --
> open to all <mailto:public-list at lists.alberg30.org> ; Wes Gardner
> <mailto:wesgardner1952 at gmail.com>
> Cc: Alberg, Public List <mailto:public-list at alberg30.org>
> Subject: Re: [Public-List] Strengthening Soft Bulkheads.
> 
> Hello Jonathan - 
> 
> I've been silently reading this exchange... I keep a close eye on SURPRISEs
> bulkheads. The only places her plywood is showing trouble is the horizontal
> shelf of the lazarettes on both sides of the main cabin, and the edges of
> the semi-bulkhead up in the forepeak.  These are degraded by water leaking
> in the hull to deck joint, which I am resolved to deal with this spring.
> 
> My experience with plywood when it starts suffering the attacks of water is
> that it's finished when it starts showing symptoms.   I reckon that's not
> good news to anyone, but I believe this to be true.  Once the glue in the
> laminate starts letting go, all you've got is a bundle of paper thin veneers
> and there's no particular strength in that to bear loads, let alone hold
> itself together.
> 
> I reckon that an emergency repair can be made by gluing and bolting a
> 'plate' of some material, be it aluminium, more plywood, or glass cloth and
> epoxy, by extending out to healthy wood and anchoring loads to that... But
> the creeping crud may be silently working its way outwards from the trouble
> you can see so surgery is the sure way to achieve a lasting cure.
> 
> And all that, is why I am not going to put off the deck edge repair again
> this year...
> 
> Gord #426 Surprise
> 
> 
> On 2016-01-29, 8:45 AM, "Jonathan Bresler via Public-List"
> <public-list at lists.alberg30.org> wrote:
> 
>> > Noodling on this a bit
>> > Guessing that
>> > 
>> >    - the bolts through the bulkhead resist the upward pull of the shrouds.
>> >    - the end of the bolt at the chainplate is being pull upwards
>> >    - the structure of the bulkhead has to resist the upwards pull
>> >    - the incompressibility of the bulkhead is what provides the resistance
>> >    - might be good to obtain a piece of G10 that extends the length of the
>> >    chainplate plus a bit, laminate the G10 to the bulkhead, through bolt >>
the
>> >    chainplate to the G10 and the bulkhead.
>> >    - at that point, guessing that it would be the G10 that is resisting the
>> >    upwards pull rather than the bulkhead, and the G10 is transferring that
>> >    force to the portion of the bulkhead that the G10 is laminated to.
>> >    - punkiness in specific small areas of the bulkhead would not matter as
>> >    the G10 is laminated to a much larger area and that area as a whole
>> would
>> >    have to fail for the G10 to move.
>> >    - might be good to do this two shrouds at a time with the chosen pair of
>> >    shrouds fully loosened.
>> > 
>> > Thoughts ?
>> > 
>> > Jonathan
>> > 
>> > On Thu, Jan 28, 2016 at 6:21 PM, Wes Gardner via Public-List <
>> > public-list at lists.alberg30.org> wrote:
>> > 
>>> >> And of course, the disclaimer - only you can evaluate the effectiveness
of
>>> >> any repair vs. replacement and as Jeff points out, how well you'll sleep
at
>>> >> night. :-)
>>> >> 
>>> >> Sent from my iPhone
>>> >> 
>>>> >>> On Jan 28, 2016, at 5:24 PM, Michael Connolly via Public-List <
>>> >> public-list at lists.alberg30.org> wrote:
>>>> >>> 
>>>> >>> Hi all,
>>>> >>> 
>>>> >>> The Lorrie Rose has many problems among them bulkheads which are
>>>> suspect.
>>>> >>> 
>>>> >>> She has wood-grained Melamine laminated to her primary bulkheads.
>>> >> Tapping with a small hammer in the vicinity of the chain plates produces
a
>>> >> hollow sound. I suspect at minimum the laminate has detached from the
>>> >> plywood substrate.  There is relatively little apparent water damage in
>>> >> this area, but there is evidence of water intrusion.
>>>> >>> 
>>>> >>> I plan to remove the chain plates and peal back or lift off the
>>>> Melamine
>>> >> where it has delaminated, revealing the condition of the plywood beneath.
>>>> >>> 
>>>> >>> My question to those on the list is.  If there is no wholesale rotten
>>> >> plywood, i.e., delaminating plies, missing pieces or punky holes but
>>> >> perhaps some soft or tender but intact plywood, would it be possible to
>>> >> consolidate the exposed plywood with some sort of penetrating epoxy
>>> >> product?  Git-rot (R) comes to mind.
>>>> >>> 
>>>> >>> I would most likely redo the tabbing to the hull and deck.  Perhaps
>>> >> lay-up some epoxy saturated fiberglass cloth to the consolidated surface
of
>>> >> the bulkhead. In other words, if the damage is not extensive or covering
a
>>> >> large area, can the bulkheads be repaired/strengthened without wholesale
>>> >> replacement?  Has anyone attempted to do this in lieu of replacing the
>>> >> bulkheads?
>>>> >>> 
>>>> >>> Thanks for your thoughts,
>>>> >>> 
>>>> >>> Michael #133
>>>> >>> 
>>>> >>> 
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>> > 
>> > 
> 
> 
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