I just had a friend replace the floor on my 16 foot aluminum boat he didnt replace the foam that was under the floor originally I am concerned that i need to have the foam under the floor and would hat to tare the floor up to foam it. I only fish on smaller lakes im not taking it huge bodies of water so im wondering if the boat is safe without the foam. if its not would it be safe to blow some foam under the floor without taking it up again