i just bought a 1983 aluminium 21 ft starcraft and started to remove the floor to replace some rotting wood. the problem i have is unpond removing the wood there is foam floation under the wood and it is wet, so i don't want to put the new wood over the wet floation. so my first question is the floation factory installed and the second if i remove the floation does it need to be replace for floor support and to keep water from being trapped in these areas.