What is LOSP treatment and how does it protect the Weatherproof® range?

LOSP is the abbreviation for Light Organic Solvent Preservative, the name given to chemicals used in the treatment of all Weatherproof products.  H3 is the hazard level which relates to the amount of treatment and the recommended worse case application.  While this H3 treatment level applies to above ground, weather-exposed applications, Woodhouse Weatherproof can be used internally.