Why Fibreglass

The fibreglass or marblelite choice

Fibreglass-lined concrete swimming pools have all of the qualities of pre-formed, factory-moulded pools. In fibreglass-lined pools, the structural strength is provided by the concrete or brick structure of the pool. The surface finish of a fibreglass-lined pool is smoother and less porous than gunite or marbelite plaster. Fibreglass linings are applied to existing gunite or marbelite pools either for cosmetic reasons, to offer an attractive finish, which is strong, durable, and requires minimal maintenance, or for functional reasons, to provide a waterproof lining for pools that are prone to leaking.

In either case, the fibreglass lining will provide a skin that is strong, and durable, and requires minimal maintenance and homeowners are finding that fibreglass-lined pools tend to be stronger, more durable and have fewer problems with surface degradation or cracking than conventional pool material.
Fibreglass reinforced polyester (GRP) composite materials, is the material that is revolutionising the pool industry by keeping water in whilst maintaining its good appearance and ease of maintenance.
Compared to a concrete or marbelite pool, a fibreglass-lined pool is generally less costly to maintain on a monthly basis. This is important to the pool owner because a clean pool is a healthy pool.

The savings come about through significant reductions in the chemicals required during summer, to maintain well-balanced, crystal-clear water, as well as a reduction in wear and tear on automatic pool cleaning equipment, due to the tough, durable, but smooth surface of the fibreglass lining compared with the relatively rough surface of gunite or marbelite plaster.

Fibreglass pools do not need a liner and do not need to be resurfaced for many years. This is a major advantage. Cleaning and maintaining fibreglass pools are quick and easy, which makes them a popular choice.

There are many benefits to owning a fibreglass-lined swimming pool:

  • Leak-proof and provides a smooth, attractive finish.
  • A fibreglass lining is less costly to maintain because there are no seams, and no joins, and the surface is smooth and less prone to fading or discolouration.
  • Saltwater chlorination can be used in these pools.
  • They are significantly less prone to fading or discolouration.
  • Mosaic patterns are generally moulded-in and cannot chip or fall off.
  • The smooth surface of the pool reduces the risk of bacterial build-up.
  • The lining of a swimming pool with fibreglass is a fast and relatively simple operation if carried out by a reputable, experienced pool company.
  • Virtually any shape and size pool can be lined with glass fibre.
  • NCS Resins materials for pool lining are of the highest quality and have been thoroughly tested to ensure their suitability for purpose in real-life applications.
  • If applied correctly, using the methods and materials recommended by NCS Resins, fibreglass-lined pools will have a lifespan far in excess of concrete or marble-plastered pools.

Fibreglass Pools

Fibreglass is fast becoming the most popular swimming pool lining material. This is because it has good stain resistant qualities.. The main contributing factor to the longevity of a fibreglass lining is the tucking in of the top edge underneath the copings. Many fibreglass contactors don’t bother with this and this will cause their fibreglass lining to delaminate within a relatively short period of time. A groove must be cut in under the copings and the fibreglass is ‘tucked in’ the groove, it is then sealed off with bonding paste.

The 2 types of fibreglass resins and gelcoats found are usually GP and Isophthalic. GP is general purpose resin or resin based products and are only suitable for repairing surfboards, motor cycle fairings, canopies, etc. whereas Isophthalic resin based fibreglass products are designed to be in water and the Isophthalic gelcoat or topcoat is waterproof.
Density of the fibreglass matt is another major issue in ensuring longevity of your fibreglass lining. Generally, the matt comes in 2 densities: 300g/m² and 450g/m². The former is not structurally as strong as the latter. 450g/m² fibreglass matt is the preferred density to use in swimming pools since it is 50% denser and therefore much thicker and stronger than the 300g/m² matt. The lifespan of the heavier matt is much longer than the lighter.

An optional higher specification is the application of a C veil tissue membrane over the fibreglass matt. This tissue membrane helps to stop the formation of pinholes in the fibreglass but its application is not an industry norm.(Some fibreglass contractors use only GP resin and gelcoat with 300g/m² and this combination is absolutely detrimental to the longevity of fibreglass pool linings. If having your pool fibreglassed, make very sure that the contractor is only using Isophthalic resin based products with 300 or 450g/m² matt preferably with the second layer of tissue membrane).
The beauty of fibreglass in pools is that algae and dirt can very easily be brushed or swept away and won’t stain the fibreglass. Marbelite becomes rough with age whereas fibreglass doesn’t. 

  • Conrad Fuller

  • Cell: 083 268 3880

  • Fax: 086 510 9637

  • P.O. Box 3100

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