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I spoke to Chuck Bennett @ Whaler today to get advice on what foam density to use. Based on the fact i will be supporting the floor, he recommended going with the 4# foam over the standard 2# foam. Since I have 16# of the 2# foam, i will use that under the stern and along the sides where structural support of the deck is not required. I do know from digging out the foam, there are a couple foam densities present in the hull. The sides are clearly 2# foam that has been allowed to rise, since the foam i drilled out looks and feels exactly like the support blocks i poured over the weekend. Based on other's experience, the foam in the deck area is more dense than 2# and less dense than 4#, so I am guessing the compression turns the 2# foam into 3# foam in the structural sections of the hull, namely the floor.