Thicker is not always better. If it is a rough base (cement or sand and cement), 28 0r 30 is better. If it is poolcrete or vermiculite base, 20 is better.
Well first of all there is no such thing as a fiberglass pool. You can have fiberglass walls instead of steel but your pool is still vinyl because you need a liner. These are the usual combinations of inground pools. 1. Sand floor, steel walls, vinyl liner 2. Sand floor, fiberglass walls, vinyl liner 3. Vermiculite floor, steel walls, vinyl liner 4. Vermiculite floor, fiberglass walls, vinyl liner 5. Concrete floor, steel walls, vinyl liner 6. Concrete floor, fiberglass walls, vinyl liner 7. Concrete floor, concrete walls, no liner Concrete pools have to be painted with epoxy paint or if you want tile installed then usually you plaster over the concrete. Now a days 3 and 4 are the most common inground installs. 1 and 2 are usually pools that are 30 + years old although you can still have them done that way. In South Alabama the cost of a 20 *40 vinyl pool will cost around 18 to 22 thousand
This is unfortunately a circuitous question since both are common names for the same product. PVC stands for PolyVinyl Chloride and this type of liner is often refered to as a "Vinyl Liner". Sometimes when someone asks for a PVC pool liner they are referring to a Commercial (reinforced for strenght and textured for slip resistance) PVC Pool Liner or PVC Pool Membrane (e.g. RenoSys is the most successfully installed North American Brand). Whereas residential PVC or Vinyl Liners are only 20 to 28 mils thick, a Commercial membrane is reinforced with a scrim and is typically 60 mils thick.
Beautiful and cute print vinyl pool liners are available aplenty online. You check up at any of these sites that sell a variety of vinyl pool liner: http://www.poolwarehouse.com/inground-pool-liners.html; http://www.pooldeals.com/catalog/Pool-Liners-p-1-c-314.html; http://www.websweeper.com/php/pool_section/pool.php AND http://www.bizrate.com/swimming-pools-jacuzzis/pool-liner/
Hydrostatic pressure or poor water chemistry. If the watertable is high the liner will float and when the water recedes will create a suction and pinch the liner. If your alkalinity and stabilizer levels are low the sanitizer will not have any molecules to attach to so it goes after the vinyl. The pulls the plastizer out the vinyl and causes it to prematurely fade and wrinkle.
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