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- Feb 5, 2024
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- Yorktown, VA
I was wondering if anyone had advice on pour foam in the subfloor and avoiding poultice corrosion?
I’m building a custom 14ft V-Hull into a Poling skiff and am trying to figure out how to foam the subfloor. The boat does have sloping sides that will drain cleanly to a channel in the middle which is great for me. I know closed cell foam will trap water between the foam and the hull, eventually cause poultice corrosion.
Here’s my original plan… Etch hull, zinc chromate primer, two thick coats of epoxy bilge paint, cut plastic tubing for extra drainage in the foam then attach to every rib (lowest side closest to the transom), then pour in foam. I am worried however that eventually the foam will slightly saturate and cause water to eat away at the hull. I do know that aluminum fuel tanks have a long life-span when coated in a similar way and those are CASED in foam usually.
This is where I get confused… I have talked to some builders that recommend not putting any foam in the subfloor, to prevent all poultice corrosion. Instead, foaming above the subfloor in compartments will prevent water getting trapped against the hull entirely. Makes sense to me, but I personally don’t like the idea of no foam under the subfloor.
Any thoughts on this? I have a tendency to overbuild things, so all opinions are welcome
. I’d love to just prime it, paint it, then continue building/framing this thing out.
I’m building a custom 14ft V-Hull into a Poling skiff and am trying to figure out how to foam the subfloor. The boat does have sloping sides that will drain cleanly to a channel in the middle which is great for me. I know closed cell foam will trap water between the foam and the hull, eventually cause poultice corrosion.
Here’s my original plan… Etch hull, zinc chromate primer, two thick coats of epoxy bilge paint, cut plastic tubing for extra drainage in the foam then attach to every rib (lowest side closest to the transom), then pour in foam. I am worried however that eventually the foam will slightly saturate and cause water to eat away at the hull. I do know that aluminum fuel tanks have a long life-span when coated in a similar way and those are CASED in foam usually.
This is where I get confused… I have talked to some builders that recommend not putting any foam in the subfloor, to prevent all poultice corrosion. Instead, foaming above the subfloor in compartments will prevent water getting trapped against the hull entirely. Makes sense to me, but I personally don’t like the idea of no foam under the subfloor.
Any thoughts on this? I have a tendency to overbuild things, so all opinions are welcome
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