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It depends on the cause. Repairing worn surface joints may be appropriate maintenance, but it cannot establish that the concealed waterproofing is sound. If the membrane is damaged, a suitable waterproofing repair or reconstruction needs to be assessed.

Explain where the water appears and when it happens. The assessment should distinguish plumbing, shower-screen seals, surface joints and concealed waterproofing before a repair is proposed. The extent of opening-up depends on the findings.

An assessment should check for restricted drainage and whether the floor slopes towards the waste. Surface pooling alone does not establish whether the concealed waterproofing has failed; the cause needs checking before choosing a repair.

Note where water collects, how long it remains after normal use and whether it backs up at the drain. Describe these details in your enquiry. If pooling persists or water escapes the shower, arrange a professional assessment rather than assuming new grout will solve it.

Ask about a shower drainage problem

Ask for the exact areas being waterproofed, the proposed products, preparation work, timing and who is responsible for each stage. Discuss how work around junctions and penetrations will be coordinated, and what is excluded from the price.

Allow time for the specified system to cure before tiling. Confirm the scope and responsibilities in the written contract before work starts, and ask what installation records and product care information will be provided at handover.

Keep drains clear, attend to deteriorating joints and avoid drilling into wet-area walls without advice. Photograph changes and arrange an assessment if dampness persists.