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Moisture Readings in Shower Areas

What They Mean for Homebuyers

Leaking showers are one of the most common hidden issues in Australian homes — and one of the most expensive if left unchecked. At True Inspect, we use moisture meters and thermal imaging as part of every pre-purchase inspection to assess the shower area for elevated dampness. These tools help identify waterproofing failures, plumbing leaks, and structural moisture before they become costly problems.

Why Moisture Readings Matter

Bathrooms are naturally wet spaces, but they should be built to contain moisture. Moisture readings help detect water that has escaped the shower’s waterproofing or plumbing system. If moisture gets behind tiles or into wall and floor structures, it can cause rot, mould, structural deterioration, and attract pests like termites.

Our inspectors use non-invasive moisture meters to detect elevated moisture within tiles, walls, and floors — without damaging any surfaces. Thermal imaging may also be used to highlight cooler areas that suggest hidden leaks.

Common Causes of High Moisture in Showers

If our readings are elevated, it often indicates one of the following:

  • Failed waterproofing membranes under tiles (in breach of AS 3740)
  • Cracked grout or deteriorated silicone at joints or corners
  • Hairline cracks in tiles or old prefab shower bases
  • Leaking tap penetrations or plumbing connections inside walls
  • Poor-quality DIY repairs with no proper re-sealing or membrane

In many cases, the problem is not visible to the naked eye — but water can still be seeping into surrounding materials and causing gradual damage.

Signs We Look For

Our team inspects both the shower itself and the areas surrounding it. Common visible symptoms include:

  • Mould, stains or discolouration on tiles or grout
  • Loose or “drummy” tiles that sound hollow or feel spongy
  • Cracked or missing grout and silicone
  • Swollen skirting boards, bubbled paint, or warped flooring behind the shower
  • A persistent musty smell in the bathroom or adjoining rooms

We combine moisture readings with these visual clues to assess the likelihood and extent of leakage.

Risks of Unaddressed Shower Leaks

Ignoring high moisture can result in:

  • Water damage to structural timbers, plasterboard or ceilings
  • Mould growth, which poses health risks
  • Termite attraction, as damp conditions are ideal for pests
  • Damage to finishes, like peeling paint, rusting fixtures and warped cabinetry
  • Escalating repair costs, potentially requiring full strip-outs

Often, what could’ve been solved with re-grouting becomes a major bathroom renovation if left too long. Early detection matters.

How We Report Moisture Issues

If True Inspect detects high moisture in a shower area, we document:

  • The exact location and meter reading
  • Supporting photos, including the meter in use
  • A description of possible causes
  • Clear recommendations for further investigation or repairs

We explain the findings in plain language and classify the severity as per Australian Standards (AS 4349.1). Where appropriate, we recommend engaging a plumber or waterproofing contractor to investigate further.

What Buyers Should Do

If high moisture is found, we recommend:

  • Don’t ignore it – treat it as a defect requiring action
  • Seek quotes from plumbers or waterproofing experts to understand scope and cost
  • Negotiate with the seller to repair or adjust the purchase price
  • Budget for early repairs if proceeding with purchase
  • Maintain the bathroom after repair to prevent recurrence

Most leaks are fixable — the key is knowing about them before you settle.

For more information, download the full information pack on Moisture Readings in Shower Areas

This guide includes inspection techniques, common faults, moisture sources, and what to do next if elevated levels are found.

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