The waterproof membrane used in swimming pools is known as a liner These fall into 2 categories and the least expensive of which is the factory produced ‘bag liner’. This type of liner is cut and then heat welded from virgin PVC to fit the size and shape of the pool.
The PVC material is .750 mm thick and is available in a wide range of colours and patterns.
Colours and patterns can be mixed to meet the taste of the customer as all liners are made on a bespoke basis.
The liner is fitted to the pool by clipping the PVC beading welded to the top of the liner into a PVC extrusion known as liner lock which is fixed to the top of the pool wall with self tapping screws.
After we are satisfied that the liner is a snug fit within the pool we then seal all openings to effect an air tight seal.
A special vacuum is then employed to suck all the air from the void that would be present between the liner and the pool shell.
Once the liner is then taut against the pool shell the pool filling can begin.
As soon as the water covers the main drain the gaskets and faceplates, which seal the liner around all the pool fittings, are installed.
When the water level reaches just below each of the pool fittings and the liner is taut then the liner is cut and the appropriate gaskets and face-plates are fitted to ensure a watertight pool.
On site lining system
The alternative to the ‘bag’ liner is an on site lining system
This type of liner was originally designed to provide a waterproof membrane to old commercial and school pools which were structurally unsound and required an economic solution to a pool structure that was leaking.
Due to it’s strength and tolerance of higher pool water temperatures (above 34 degrees C) and longer life it has becoming increasingly popular in private pools both in renovation and for new pool installations.
The 1.5mm thick PVC material is reinforced with a polyester scrim, which makes it much stronger than a bag liner.
The material is delivered to site in 1.5 metre wide rolls and is then cut into panels to suit the shape and profile of the pool.
The liner is then heat welded to a PVC coated profile fixed to the top of the wall or a bead is welded to the liner wall and this is fitted into a PVC extrusion in a similar method as a bag liner is fitted.
Each panel is heat welded and then a solvent adhesive is used to ensure complete water tightness.
Available in both plain and pattern materials the on site lining is proving to be popular with customers who require a pool liner which will last longer and will tolerate pool water temperatures in excess of 35 degrees C.