Dealing with sub floor moisture can be worrisome and expensive if the problem is ignored. However, there is a solution to sealing sub floors and controlling damage from moisture. After the sub floor has been dried, an application of closed cell spray foam insulation seals the wood and prevents further moisture damage. Sealing your sub floor prevents not only moisture damage, it also prevents termite damage, and unwanted air flow. This makes your home more comfortable and less expensive to heat and cool.