" If you have a leaky building, Builders Plastics Contracting can waterproof your building including external waterproofing and liquid applied waterproofing membranes. Our waterproof roofing coatings are generally BRANZ approved and warrantied. These membrane joints are welded as opposed to glued and life expectancy is expected to be well over 15 years. Builders Plastics Contracting specialise in supply and application of a wide range of Torchon membranes. . "