rot in hull.

[hwkeene]

I have to repair some rot in mahogany carvel planking and I am unsure how far to take out from either side of the rot, to solid wood or beyond?
regards, harry.

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[Blue_Blazes]

It's always best to go some way beyond the rot. A couple of feet if possible, or at least to the next rib after you reach solid timber.

Bill.

<hr width=100% size=1>One of these days I'll have a boat that WORKS

 

[hwkeene]

bill, do you mean 2 feet either side of the rot due to the rot travelling down the grain.
regards, harry

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[Peterduck]

It seems to depend on who you talk to as to how far you should go beyond the extent of rot to eliminate the spores. I was told a foot in each direction if you are not constrained by some other factor. I suspect that rot spores travel better in some timbers than in others, so that has to be taken into account as well. They will definitely travel better along the grain than across it. It would be nice if we had soem form of stain which reacts with the spores to show where they are and are not. Unfortunately, we don't have such a thing, and I doubt that there is sufficient commercial application for someone to be encouraged to develop one.
Peter.

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[tillergirl]

I would also check where the joints are. You don't want a new joint created too close to an exisiting one in the planks above and below.

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[Blue_Blazes]

I tend to agree with both the other guys who've posted so far. Yes, rot travels better along the grain, and I suspect (IMHO) that it travels further and faster in softer/ more porous timber. The 2 foot (600mm) reccomendation is based on good building renovation practice. A foot may well be OK, you will have to use your best judgement. If the timber shows any softness or discolouration, have it out. Tillergirl has a good point, if you are getting near to a joint when you cut back, it makes sense to go the extra mile (not literally) and remove back to the existing joint, thereby only creating one extra joint.

Bill.

<hr width=100% size=1>One of these days I'll have a boat that WORKS

 

[hwkeene]

blue, take your point, rot is unlikely to travel across a joint, but we have splines in between each plank, glued, and they look to be ok, can see no rot in the splines but from what you are saying we may have to remove up to five feet of mahogany, which is very dense, to eradicate the rot.

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