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Foam under the decking, pros and cons...
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<blockquote data-quote="bassboy1" data-source="post: 275494" data-attributes="member: 55"><p>Why bother with the foam, in that case? Bags of air would actually provide better flotation, as they wouldn't have the weight of the foam counteracting them. I'm not a big proponent of foam (there are better options for water displacement, which is all that is desired) in aluminum boats, but I'm also not real thrilled with the idea of plastic bags providing safe flotation. </p><p></p><p>Foam does have the benefit of sound deadening and deck support, however it also is a major cause of corrosion when placed or poured up against aluminum. The important thing to do with foam would be to pour it in blocks, sealed in plastic (you are using the plastic to protect the aluminum, not to protect the foam from water), furred up from the hull with 1/2" plastic of some sort. This allows bilge water to flow where it needs to, and grants the aluminum the airflow that it needs to maintain the correct oxidation level, and as such, remain chemically stable.</p></blockquote><p></p>
[QUOTE="bassboy1, post: 275494, member: 55"] Why bother with the foam, in that case? Bags of air would actually provide better flotation, as they wouldn't have the weight of the foam counteracting them. I'm not a big proponent of foam (there are better options for water displacement, which is all that is desired) in aluminum boats, but I'm also not real thrilled with the idea of plastic bags providing safe flotation. Foam does have the benefit of sound deadening and deck support, however it also is a major cause of corrosion when placed or poured up against aluminum. The important thing to do with foam would be to pour it in blocks, sealed in plastic (you are using the plastic to protect the aluminum, not to protect the foam from water), furred up from the hull with 1/2" plastic of some sort. This allows bilge water to flow where it needs to, and grants the aluminum the airflow that it needs to maintain the correct oxidation level, and as such, remain chemically stable. [/QUOTE]
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Foam under the decking, pros and cons...
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