Patent ID: 7802403

Claim:
A method of retarding vapor intrusion into a building comprising the steps of: 1. removing a roof structure of said building; 2. applying a water resistant, synthetic high tack mastic to all wall panels and all peripheral vertical roof supports on the areas that contact said roof structure; 3. applying a first water insoluble caulking strip in a ring about said building on an interior surface of said wall panels; 4. installing a first membrane such that a first edge of said first membrane overlaps said first caulking strip and said first membrane resides atop said applied synthetic mastic; 5. affixing said first edge of said first membrane to said wall panels with mechanical fasteners that compress a double sealing strip means on said first membrane, adjacent to said first edge and atop said first caulking strip; 6. pressure rolling said first membrane into said mastic to eliminate air pockets and improve adhesion; 7. replacing said roof structure; 8. folding said first membrane onto a top surface of said roof structure; 9. affixing said first membrane to said top surface of said roof structure with at least one mechanical fastener and polymer wall membrane securement means; 10. installing a seam sealed unitary second membrane over said roof and overlapping said second membrane onto the exposed roof sections of said second membrane; 11. seam seal said second membrane to said first membrane so as to form a unitary membrane seal about said roof structure.