Rotten wood in Stringers

[Hoover]

I got the floor up and most of the inner transom removed. When I cut through the stringers to be able to fit the new transom in I found that the plywood inside the stringers is rotten. The fiberglass surrounding the stringers is in good shape and is reasonably thick too. Do I need to replace the stringers or since the fiberglass is good can I leave them alone.

[Islandtrader]

If the glass is in good shape no need to remove the stringer. Just match the shape that was removed and glass over it. Tie this into the transom and you should be good to go. Remember the wood or foam stringer does not add any significant strength...it is for shaping the fiberglass...that is where your rigidity comes from.

[KenB]

Hi,

Quick question... I though the value of the wood/foam in a stringer is to keep the whole form from flexing. Should he at least fill with foam?

--
best,
KenB

[3rdday]

what Island trader said, This is the lost mold process. Think about a rectangular tube the strength comes from its shape or form.
If you are going to laminate over the top of the existing stringers wipe with solvent, abrade very well with coarse media, wipe again with solvent, I would use several layers of at least 1700 Biax cloth (Biax for structural) and laminating epoxy resin. you will get better secondary bonding with epoxy over polyester or vinylester.

[Hoover]

As always you guys are the best. Thanks