MIRACLE Lumber Lock is a heavy-duty sub-floor adhesive. It is stronger than the lumber it locks together. Lumber lock has the best all-weather versatility available, easy to gun in cold weather and doesn?t drool in hot weather, remains permanently flexible to absorb vibrations and maintain a quiet floor for years, regularly used on wet, frozen, chemically pressure treated lumber or untreated lumber. It bridges framing irregularities and increases the strength of structural flooring systems. This product passes ASTM D3498 and AFG01.