The World's Most Advanced Lumber Sealant



Complete Crawl Space Framing & Subfloor Sealer

Watson Seal® LumberKote™ is the FIRST Non-Toxic, V.O.C. Free, Crawl Space Framing & Subfloor Polymer Sealer specifically designed to PROTECT your structural Framing and Subfloor System from excessive moisture absorption and rapid moisture uptake that deteriorates and rots lumber and accelerates the growth and damage by wood destroying mold and fungus. The sealer forms a tough, durable micro-film once dry that protects your crawl space framing and subfloor in one step. LumberKote's™ micro-film resists mold and fungus (ASTM D3273) and is USDA and FDA compliant.

Our long-chain polymer technology utilizes controlled desiccation osmosis to immediately begin drying out lumber and stabilizing the lumber's moisture content to acceptable levels when situations of repairs are required like sagging floors, hardwood cupping, etc. LumberKote™ works to prevent these costly issues from occuring in newer constructed homes, saving homeowners the trouble and expense down the road.

LumberKote™ works on all types of lumber including Engineered Joists, OSB, Plywood, Spruce, Pine, Oak and Fir. It dries to durable satin finish and is a semi-transparent orange. This allows installers, home owners and potential home buyers to easily recognize this home's floor framing system is Watson Seal® PROTECTED.

LumberKote™ is the best solution to ensuring the perfect "bullet-proof" crawl space encapsulation or can be used alone and delivers an unmatched level of protection and peace-of-mind in re-active damage repair, pro-active damage prevention, stage or budgetary situations. Talk to your Authorized Watson Seal LumberKote Dealer about what's best for you and your home's situation.

Authorized dealers

Professional Installation - 30 Year Warranty

Watson Seal™ LumberKote™ CS is  professionally installed by our Authorized Dealers. Our Authorized Dealers are experienced, "Customer First" local companies, fully licensed and insured. Our Dealers are Watson Seal™ Trained and Certified  by our experts to deliver the ultimate customer experience and service.

With our "Perfect Install Guarantee" comes an industry leading 30 Year, Fully Transferable Manufacturer's Warranty with up to $5,000 in water/moisture damaged lumber replacement.


LumberKote™ CS is FEMA Flood Grade Rated, staving off flood waters and protecting the lumber from rapid water uptake and biologicals for an unprecedented 18 days. In addition to our 30 Year Manufacturer's Warranty, Watson Seal issues a multiple-event Lifetime Flood Warranty.

Our sealer's history and independent certified testing allowed Watson Seal® a $1,000,000 Product Mold Rider direct from our Insurance Underwriter. In other words, the "risk" of mold and fungus to grow and feed on the lumber once Watson Seal® protected has been assessed and deemed insurable. Does your home owner's insurance cover mold and fungus in the crawl space without a qualifying event? We do.

A Green Company


Watson Seal® is a proud member of the USGBC (US Green Building Council) and we follow the American Society for Testing and Materials (ASTM) guidelines. While our sealer is Non-Toxic, VOC Free and safe for the entire family, pets and the environment -the quality, durability and benefits of Watson Seal® remain uncompromised.

Watson Seal® sealers meet or exceed ASTM Guidelines, are USGBC LEED rated for points during construction, meet all indoor air quality guidelines and is a 'must' for flood and hurricane prone coastal and flood damaged structure remodels. Chemically verified by Independent Labs for non-toxicity and component registration.

Members & Affiliations