Jeanneau 36i trapped water

[minkysailing]

Looking to buy a 2007 Jeanneau 36i and the surveyor has found water trapped between the inner mould and hull underthe fuel and water tanks back aft. Has anyone experienced this problem and how to rectify. Is this a walk away matter or something that is cosmetic. Would be good to get a diagram of the inner mould to uderstand why this watter has got trapped and not drained to the bilge. Any help!

 

[Tranona]

What does the surveyor say? You are paying him for his professional advice - ask him for it!

 

[Mr Cassandra]

Looking to buy a 2007 Jeanneau 36i and the surveyor has found water trapped between the inner mould and hull underthe fuel and water tanks back aft. Has anyone experienced this problem and how to rectify. Is this a walk away matter or something that is cosmetic. Would be good to get a diagram of the inner mould to uderstand why this watter has got trapped and not drained to the bilge. Any help!

Drill a hole in the bottom and let it out

 

[Spyro]

Looking to buy a 2007 Jeanneau 36i and the surveyor has found water trapped between the inner mould and hull underthe fuel and water tanks back aft. Has anyone experienced this problem and how to rectify. Is this a walk away matter or something that is cosmetic. Would be good to get a diagram of the inner mould to uderstand why this watter has got trapped and not drained to the bilge. Any help!

Definetly not a walk away job But I would want it fixed before purchasing.I would be more concerned where it has got in, possibly just through a deck fitting or more worrying if it was the hull to deck join. 2007 is not very old, could you ask the previous owner if he has had trouble? I would have thought if he had it would have been repaired under warranty.

 

[Martin_J]

On any modern GRP boat you can get water into the stern sections. The design of mouldings then often allows for this water to be channelled forwards (underneath the interior moulding) and out through drain holes towards the lower part of the central bilge (under the main saloon).

I am guessing that the water is from the aft sections (e.g. aft locker, steering mechanism, stern light gland etc...) that drips into the internal area, drains forward (as expected - check if there are drain holes in the aft section of the moulding where it is glued to the hull) and then just does not quite get out again at the forwards end - possibly due to a small step upwards.

It would only take a few cupfuls of water to spread over a large area (and be noticed by a moisture detector) if the hull at that point is relatively flat in section.

Knowledge of the underside of any moulding is helpful before cutting away to check what is underneath since the underside may easily be filled (with either resin or foam).

 

[CET1]

We have the sunfast 36 from 1996. Two thoughts, this year we have had more condensation on the inside of the hull mainly due we think to the low temperatures which have been experienced. So if the amount of water is small then this may account for it. Also at the moment we changing from tiller to wheelafter the local agents told us it would be impossible. I contacted Jeanneau France tecnical department by email and they sent me some exploded drawings for the boat which have helped us with the engineering design.
They may be able to help and may have experienced the problem else where with what is a relatively new boat.

 

[TradewindSailor]

It may be as simple as a blocked drainage/limber hole ...... but then I don't know the details of the boat.

 

[Mrnotming]

Looking to buy a 2007 Jeanneau 36i and the surveyor has found water trapped between the inner mould and hull underthe fuel and water tanks back aft. Has anyone experienced this problem and how to rectify. Is this a walk away matter or something that is cosmetic. Would be good to get a diagram of the inner mould to uderstand why this watter has got trapped and not drained to the bilge. Any help!

This happens a lot and not only on modern boats with bonded in grid floorpans.As another helpful poster pointed out limber holes need to be cleared or extras added.In our boat we thread a length of soft rope through a limber hole into the nearest crossmember to the accumulation of water and on top of this (weighted down) we place a pampers disposable nappy which wicks up all the remaining water and dampness.As the Jeanneau is of fairly recent manufacture,
its just something to be looked after mantainance wise.When boats are not on swinging moorings rain can get in the companionway and find its way down various routes, but it can be water from a leaky engine water pump, a prop gland or rudder stuffing box or indeed any deck fitting or hole for electronics wires not being properly sealed.IMHO not a reason to reject the vessel.

 

[PeterGibbs]

Looking to buy a 2007 Jeanneau 36i and the surveyor has found water trapped between the inner mould and hull underthe fuel and water tanks back aft. Has anyone experienced this problem and how to rectify. Is this a walk away matter or something that is cosmetic. Would be good to get a diagram of the inner mould to uderstand why this watter has got trapped and not drained to the bilge. Any help!

As others have commented, water (?fresh or salt) can slosh around the base of large flattish hulled yachts. The limber holes are designed (should be) to move water to the lowest point for extraction. This, I'm sure you already know.

But if the water tank has suffered some damage through poor installation (pinched at a corner in the bed under the tank?) or DIY that didn't go too well (tapping into tank not done well, tank whacked whilst fitting added equipment - heating eg - etc) then you have a walk away situation. Water tanks are pretty well assumed to last the life of the boat - how could they be replaced? Removal is not a problem of course.

PWG

 

[Grumpybear]

Hmmm

Slight drift, I know, but since 2003 we have a 1999 SO36.2. Last year the forward water tank (rigid polypropylene, too big to remove from the boat in one piece) started to leak. Over a prolonged period, so as not to interfere too much with actually using the boat, we replaced the three tank connectors (all apparently crudely bodged into place with mastic sealant at the factory) and the filler hose connection (hose oversize for the spigot but lots more mastic), and resealed the horizontal weld and the four level probe penetrations (a real b*****d as the inspection hatches and their soft rubber seal rings had been sikaflexed into place) - all to no avail. Eventually we found a tiny hole in the corner of one of the moulded lower baffles, apparently where the material had thinned too much during moulding - but why did it last almost ten years? A dollop of underwater epoxy putty seems to have sorted it - for now.

This problem has come as something of a shock as until then we were very happy about the build quality and strength of the boat in comparison with newer models.