What # foam do I need for encasing a battery box in the bow of 14' boat?

[RaisedByWolves]

I have done this once before about 25yrs ago but I have lost the recipe.

I was 20 something at the time so I probably just bought whatever anyway, so heres my plan.

I want the battery in the bow of the boat for weight distribution purposes and also to have it out of the way. The boat will have a small deck on the bow for trolling motor, anchor, lights etc.

I want to dam off the section under the bow and pour expanding foam around the battery box to secure it in place and want foam strong enough to do this without going overboard and wasting money on a density I dont need.


Any advice?

 

[Scott Danforth]

2# should be more than enough. 4# is structural.

 

[alldodge]

Agree, 2# is plenty