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Duranite Polymer Membrane System

The base material for Duranite Polymer Membrane System is a heavily modified PVC (Polyvinl Chloride) compound. PVC in its many different forms is widely utilized throughout construction and manufacturing, where it is recognized for its durability, flexibility and resistance to ultra-violet radiation (UV). PVC has now in fact replaced many more construction materials than most of us realize  In our homes traditional (and expensive) copper water piping has become obsolete, with flexible PVC piping supplied in coils up to 30 meters long resulting in fewer joints and greater heat retention. The properties of PVC are such that these pipes are designed to carry water from a boiler at up to 82 degrees under high pressure, without adverse effects over the lifetime of a building. In its more rigid form PVC is also responsible for carrying waste from our sinks, toilets, baths and showers whilst being maintenance free never requiring painting. This doesn’t stop at the soil pipe disappearing into the ground at the side of your house, thanks to its toughness and long term durability PVC has also replaced heavy and expensive cast iron as the material of choice for sewage, storm water, and underground drainage piping.

PVC Already In Use

In fact the vast majority of us already rely on PVC to keep the rain, wind and intruders out of our homes. Over the last 30 years U-PVC (unplasticised-PVC) doors, windows, fascia boards and guttering etc have made our homes infinitely more secure, warm, comfortable and attractive, whilst eliminating the need for maintenance.

PVC Polymers For Flat Roofing

The use of PVC polymers for flat roofing was pioneered in Germany and Switzerland in the 1960s, and arrived in the UK in the 1970s. Duranite was developed to be a rugged, highly flexible plasticized PVC polymer which fights weathering and chemical attack, withstands extremes of temperature, and remains flexible down to -30 degrees. Duranite is now regarded as the future in flat roof waterproofing, and is produced in rolls up to 2 meters wide;all site seams consist of a minimum 50 mm overlap, the two sides of which are homogeneously welded and permanently become once, creating a double layer which is stronger than membrane itself, and does not involve any other substances such as glues etc. A good indication of the strength of an Duranite weld is the fact that U-PVC doors and window frames etc are simply made from lengths of U-PVC cut to length and welded together at the corners by the same principle as Duranite PVC is welded together on a flat roof.

Over 90% of flat roof leaks and failures are a result of defective edge details, many systems do not include edge trims and require “improvised” details to be produced on site, where edge trims are included most systems use plastics  The forces of expansion and contraction between differing materials also play a large part in such problems. For these reasons Duranite designed a range of edge trims and wall flashings fabricated solely from light gauge galvanized steel, which are laminated in Duranite to allow a homogeneous seam weld between the membrane and edge trims, creating an airtight seal. These are mechanically fixed into the roof deck (and brickwork where flashings are involved) using approved fasteners  and can realistically be expected to outlive the structure they are attached to.