This is for a flooring structure on a boat. Ideally using E94 (fast) foam, rather than the slower kind. Holes can be put into the plywood to allow foam in and expansion out, if that helps. Can this be done by injecting into the cavity or would it need to be done by filling, the tediously sanding down the dried foam. The first is highly preferable, but I am not clear how this stuff expands (rate, evenness etc).
for a more thorough job with no voids and better structural strength it would be better to fill the fully encapsulated area. the expansion rate is per manufacturer, they can give you this info. drill holes in top surface, no larger than necessary, and apply a release agent or if its raw plywood tape down cardboard on surface to catch overflow, later ,fill holes with a good quality epoxy resin. make sure you have sufficient escape routes for foam. it can cause things to "bow" since its pretty determined to go somewhere.determine as close as possible the amount you need to pour in and add about 5%
What is the best way to fill a horizontal plywood cavity with polyurethane foam for the purposes of insulation
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Yes, you can use spray foam in most instances. Use material that is specifically intended for marine applications. Expansion rates differ according to temperature, humidity, etc. Read the instructions on the side of the can, or ask the manufacturer for help.
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for a more thorough job with no voids and better structural strength it would be better to fill the fully encapsulated area. the expansion rate is per manufacturer, they can give you this info. drill holes in top surface, no larger than necessary, and apply a release agent or if its raw plywood tape down cardboard on surface to catch overflow, later ,fill holes with a good quality epoxy resin. make sure you have sufficient escape routes for foam. it can cause things to "bow" since its pretty determined to go somewhere.determine as close as possible the amount you need to pour in and add about 5%
References :