Geotextile Membranes form an integral part of any riding arena construction project. Typically there are two types of membrane required for an arena, the Woven G90 and the Non-Woven NW8. The G90 is designed to go directly below the arena sub-base to separate the sub-base from the drainage system below. This prevents any fine material from the upper surface entering the drainage system and potentially creating a blockage. The use of G90 membrane also helps prevent the sub-soil the arena is built on from migrating upwards and contaminating the arena sub-base.
The NW8 geotextile membrane is used to seperate the upper surface (i.e. sand and rubber) from the sub-base below. Seperation of the two layers is critical to prevent stones from rising to the surface and also to prevent the upper surface from disappearing into the sub-base below. Due to the law of gravity the sub-base will naturally want to rise to the surface and thus over the time the upper surface will become contamintated with sub-base material if a membrane is not used. NW8 is also essential as it helps to grip the upper surface preventing slippage when the surface is ridden on.
How membranes are laid
Particular attention should be paid to the way the respective membranes are laid. It is critical that there are no gaps or holes in the membranes once laid to prevent material working its way underneath which is the prime cause of membranes coming to the surface. Please see Riding Arena Construction Diagram for more information.
Both membranes allow water to pass freely and are available by the roll.
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