Waterproofing

Diagnose damp, seal roofs and balconies, repair showers, and choose systems that suit your climate.

Rising dampBalconiesShowersBasementsSealants

Learn it properly

Waterproofing guides

3 published

Waterproofing · 2–3 days including drying

How to waterproof a shower before tiling

A durable shower starts with a stable substrate, correct falls, reinforced corners, and a complete compatible membrane system.

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02W

Waterproofing · 30–60 min assessment

Is it rising damp, condensation or a plumbing leak?

Compare height, shape, timing, location and weather patterns before paying for a treatment that may solve the wrong problem.

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03W

Waterproofing · 15 min decision guide

Can you waterproof over existing tiles?

Sometimes—but only after proving the old tiled assembly is stable and resolving falls, drainage, thresholds and edge details.

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A sound starting point

What to check first

Waterproofing succeeds when the water source, route and exit are understood before a product is chosen. Start with drainage and detailing, then match a complete system to the surface and exposure.

Trace the source

Separate rain entry, plumbing leaks, condensation and ground moisture. Similar stains can need completely different repairs.

Inspect junctions

Corners, outlets, penetrations, thresholds and changes of material usually fail before the broad flat area.

Use one system

Primer, membrane, reinforcement, adhesive and sealant should be compatible and installed to the maker’s full specification.

South Africa · Australia · New Zealand

Regional context

In South Africa, Australia and New Zealand, exposure can range from intense UV and wind-driven rain to coastal salt, frost and humid subtropical conditions. Specify the system for the exact surface, water pressure, movement and climate; a product approved for an internal shower is not automatically suitable for a balcony, basement or exposed roof.

Plan the work

A better project brief

Diagnose before quoting

Record when water appears, weather conditions, plumbing use and the highest damp evidence. Ask each contractor to identify the source and path, not merely name a coating.

Detail every transition

Draw drains, thresholds, corners, penetrations, upstands and movement joints. These small areas control the performance of the broad membrane.

Keep installation evidence

Retain substrate checks, batch numbers, coverage calculations, coat times, photographs, tests, certificates and maintenance requirements before finishes conceal the work.

Common questions

Waterproofing quick answers

Can waterproofing be applied over an existing leak?+

Only after the source, trapped moisture and failed detailing are corrected. Coating over an active defect often hides it temporarily.

How long should waterproofing last?+

Service life depends on exposure, movement, drainage, preparation and the complete system. Inspect exposed details and sealants regularly.

What is the difference between water-resistant and waterproof?+

Water-resistant materials tolerate limited moisture exposure; waterproof systems prevent water passage under their specified conditions. Local codes define where each performance level is required.

Should waterproofing be flood tested?+

Where permitted or required, a controlled test can reveal defects before finishes are installed. The test method, duration, drainage isolation and structural limits must be agreed by the responsible professional.

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