a method for creating a barrier to protect wood materials for house construction or wooden structures such as houses from humidity , moisture and / or biological attacks , such as wood decaying fungi and termites , is disclosed . the method is to treat wood itself or , preferably , the ground surface under the floor with a liquid containing a synthetic resin emulsion and an anti - fungal and wood - preservative agent and / or a pesticide such as termite - controlling agent , and further , a foaming agent . the barrier contains a selected copolymer of vinyl acetate and a polyurethane polymer .