When does a full pool renovation make sense?

Repair or renovation: the difference

A repair fixes a defined fault: a leaking fitting, a cracked pipe, a patch of loose tiles, a failed pump. A renovation renews one or more whole systems of the pool. In practice there are four:

• the interior finish (tiles, mosaic or plaster)
• the waterproofing behind it
• the pipework and fittings
• the equipment in the plant room

The decision is rarely all or nothing. Many good renovations are one or two systems done properly, timed so that the pool only has to be emptied once.

The four main renovation scopes

Resurfacing

Plaster and render finishes are wear surfaces, and on a concrete pool they are renewed during its life. Resurfacing usually means removing the old finish back to a sound base and applying a new one.

Re-tiling

When tiles are hollow, loose or cracking across large areas, re-fixing individual tiles stops working. The tiles are stripped, the base is checked and repaired, and the pool is re-tiled with a system rated for immersion. Missing movement joints are a common root cause and should be put right at this stage.

Waterproofing renewal

If leak detection rules out the pipework and the shell itself is losing water, the waterproofing needs attention. Options range from a new membrane behind new tiles to relining the pool. Stainless steel and PVC membrane systems are also offered for the renovation of ageing concrete pools; Natare, for example, lists this among the uses of its stainless steel systems.

Equipment replacement

Pumps, filters, chillers, lighting and controls can be renewed without touching the shell. Where a pool's plans were approved in Dubai, the plan approval guideline sets equipment expectations such as filter numbers by pool type and two pumps per pool, so ask the specialist whether any change affects compliance.

Questions that help you decide

1. Is the fault local or widespread? One cracked tile is a repair. A third of the pool sounding hollow is not.
2. Has the cause been found? If the pool is losing water, commission leak detection before any renovation quote. Renovating over an undiagnosed leak risks spending heavily and keeping the problem.
3. How often has this system been repaired already? Repeated repairs to the same tiles, pipe run or equipment suggest the underlying system is the problem.
4. Will the pool have to be emptied anyway? Emptying, curing and refilling are a significant part of any job. If one major task needs an empty pool, it usually makes sense to have the other systems assessed at the same time.
5. Do you want to change anything? New steps, lighting, a different depth, a diving board or a slide are alterations. Dubai Municipality's guidelines state that pools must not be altered or modified, for example by adding a diving board or slides, without its approval.
6. Is the pool shared? For a building or compound pool, the management entity will need to approve the work, plan the closure and protect residents during it.

Emptying a pool is a decision in its own right

Ask the specialist how they will assess the risks of draining before they do it, including groundwater conditions around an in-ground shell. Manufacturers of waterproofing systems take groundwater seriously: Construction Chemicals tells installers not to apply its membrane to in-ground concrete pools subject to hydrostatic back pressure from outside the shell.

Ask, too, where the water will go. Disposal of pool water is not a free choice: Dubai plan approval submissions, for example, must show how backwash water is disposed of. Your specialist should know the arrangement that applies to your property.

During works on a shared pool, Dubai Municipality's public pool guideline asks operators to prevent unauthorised access, especially by children, with barricades or fenced, locked work areas, and to fit a safety net or cover over an empty pool.

Curing and refilling

New finishes and adhesives must cure before the pool is refilled, and the timings come from the product system. They vary between manufacturers. UltraTileFix, for example, advises leaving a tiled pool for at least three weeks before introducing water and filling no faster than 750 mm in depth per day, while Construction Chemicals gives a minimum of seven days at 23°C and 50 percent relative humidity before filling, longer in cooler conditions. A proposal that does not mention curing time is incomplete.

Getting proposals you can compare

Ask every specialist to quote against the same written description of the pool and the problem, and to state:

• what they inspected or tested before quoting
• each system they propose to renew, and the products or system they will use
• how they will drain, protect, cure and refill the pool
• who obtains any approvals from the authority or building management
• what is excluded
• warranty terms for workmanship and for equipment

Comparing price alone between a full renovation and a patch repair tells you very little. Comparing scopes tells you a lot.