The problem with swimming pool jointsUsing the wrong sealant can be detrimental to the lifespan of a swimming pool or wet area. If water seeps behind the joints, or worse, freezes, it can damage tiles and turn into a costly repair job.
Ideally, the joints in swimming pools should be sealed with 100% silicone products that cure well under humidity and form a permanent elastic seal, with low shrinkage and no bubbles. Sealants should also be UV resistant, flexible and compatible with the environment they are being used in.
Bostik offers a wide range of professional swimming pool sealants suitable for both indoor and outdoor pools and other wet areas. To choose the best pool sealant for you, you must consider the following factors.
Factors to consider when choosing your swimming pool sealant
Durability and flexibility
Swimming pools and surrounding areas can be a breeding ground for mould, fungus and bacteria due to the warm temperatures and humidity. Ensuring that your swimming pool is protected and remains low maintenance for years to come will depend on the properties of your sealant and how it is applied.
The best sealants for swimming pools must have:
- Very good water resistance
- High chlorine resistance
- Very good resistance to fungal attack
- High elasticity and flexibility
- High durability
Plus, the unique formulas of Bostik’s best pool sealants give excellent gunning and tooling properties.
Above or below the water line?
Knowing if you need to work above or below the water line will affect which pool sealant you require.
Areas above the water line experience frequent humidity and water ‘wear and tear’, but are not continuously submerged in water. This is the most common place to apply a Bostik swimming pool sealant.
Sealing below the water line means sealing a joint that will be fully submerged in chlorinated water, continuously. When it comes to sealing swimming pool joints below the water line, we strongly advise you to contact our experts for the best product recommendations.
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Material and finish of your pool
It is important to understand how the material and finish will affect which sealant you require.
We have neutral cure silicones available that are suitable for wet areas. Neutral cure silicone is non-staining on natural stones and non-corrosive for stainless steel. Sealants that include acetic acid cure can be corrosive to metals, so we recommend to always use neutral cure.
For sealing joints around ceramic tiles, natural stone or stainless steel above the water line, we recommend using our Bostik S765 Premium N.
For sealing joints within PMMA above the water line, we recommend using our Bostik S780 Glass'N'Seal Premium.
How to prepare before applying a swimming pool sealantBefore you start sealing swimming pool joints, perform the following checks to ensure lasting results.
- Check the substrates before purchasing your sealants. If you’re working with porous material like natural stone, then choose non-staining products to avoid discoloration.
- For shiny, flat surfaces, a pure non-shrinking silicone sealant will give a better aesthetic finish.
- Before applying any sealant, ensure the sides of the joint surface are clean, dry and free from contamination.
- If you are renewing a sealant joint, ensure that all failed sealant is removed and that the surface is sound. Mechanical abrasion may be needed and primer can be considered to help prepare the surface.
- For deep gaps in joints, a backer rod or foam piece should be used before applying the sealant.
Tips when applying a swimming pool sealantOne of the key areas of sealing is ensuring correctly sized fillet joints to help to ensure your wet area is fully waterproof.
Fillet joints are used to create a smooth transition between horizontal and vertical surfaces between adjacent walls. Due to the more severe conditions experienced in pools and wet areas, it is recommended that exposed fillet joints should have a face front of approximately 16mm, this gives 10mm of contact areas on wall to floor joints for a more robust seal.
Creating fillet joints correctly will help to reduce the risk of leaving an unsealed area, which could then be more likely to experience damage over time.
Everything you need to know before sealing pool joints
Which sealant should you choose for the swimming pool area?
silicone sealant. Ideally, one that is suitable for glazing applications and once cured, can withstand temperature fluctuations. You need a sealant that is suitable for PMMA and PC, which does not crack due to environmental stress.
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