Signs of Termite Activity in Brisbane Homes

Why Termite Activity Can Be Difficult to Spot

Subterranean termites — the species responsible for the vast majority of structural damage in Brisbane — are cryptic by nature. They avoid light and open air, preferring to work within the timber they are consuming or within the shelter tubes they construct from soil, mud and faecal material. This means that by the time visible signs appear, termite activity may have been present for some time.

A visual, non-invasive termite inspection is designed to assess accessible areas and identify visible evidence of termite activity, termite damage and conducive conditions at the time of inspection. Concealed termite activity may require further investigation where suspected. This is why regular professional inspections are important — a trained inspector knows where to look and what to look for, and uses tools such as moisture meters and thermal imaging to assist in identifying areas of concern.

That said, there are signs that homeowners can look for themselves. Knowing what to watch for means you can act promptly if something concerning is found.

Mud Leads and Termite Shelter Tubes

One of the most recognisable signs of subterranean termite activity is the presence of mud leads or shelter tubes. These are narrow, tube-like structures — typically 5 to 20 mm wide — constructed from soil, mud, faecal material and saliva. Termites use them to travel between their underground nest and their food source while remaining protected from light, air movement and predators.

Mud leads are commonly found on:

• Concrete stumps, steel posts and brick piers in sub-floor areas
• The exterior of concrete slab edges and weep holes
• Internal and external walls, particularly near the base
• Timber framing, bearers and joists in sub-floor areas
• Fences, retaining walls and garden structures
• Tree stumps, landscaping timbers and garden sleepers

Fresh mud leads that are intact and moist indicate active termite movement. Dry, crumbling or broken leads may indicate past activity that has ceased, but this should be confirmed by a professional inspection — termites sometimes abandon leads temporarily and return later.

Hollow, Damaged or Soft Timber

Termites consume timber from the inside out, leaving a thin outer shell that may appear intact on the surface. Tapping or pressing on affected timber often reveals a hollow sound or a soft, papery feel. In more advanced cases, the surface of the timber may crack or collapse under light pressure.

Areas to check include skirting boards, door frames, window frames, architraves, flooring, decking and any exposed timber in sub-floor or roof void areas. Timber that sounds hollow when tapped, feels soft or spongy, or shows surface cracking or blistering may warrant closer inspection.

It is important to note that not all hollow-sounding timber indicates termite activity — some timber naturally develops hollow sections over time. However, hollow timber in combination with other signs, or in areas known to be at risk, should be assessed by a professional.

Tight Doors, Bubbling Paint or Distorted Skirting

As termites consume timber and introduce moisture into wall framing and door frames, the affected timber can swell and distort. This can cause doors and windows to become difficult to open or close, even when there has been no significant change in weather conditions.

Paint bubbling, blistering or peeling on walls or skirting boards — particularly in areas not exposed to direct moisture — can also indicate termite activity behind the surface. The moisture introduced by termites can cause paint to lift from the substrate.

Distorted, warped or cracked skirting boards, particularly at floor level, can also be a sign of termite activity in the wall framing or flooring beneath. These signs are not always caused by termites — moisture ingress, poor ventilation and building movement can produce similar effects — but they are worth investigating, particularly in older homes or properties with known termite risk factors.

Moisture, Drainage and Garden Contact Issues

Subterranean termites require moisture to survive and are strongly attracted to damp conditions. Properties with moisture issues — leaking pipes, poor drainage, inadequate sub-floor ventilation, leaking gutters or downpipes, or garden beds built up against the building — are at higher risk of termite activity.

While these conditions are not signs of active termite activity in themselves, they are conducive conditions that increase risk. A professional termite inspection will identify and document these conditions as part of the inspection report, along with recommendations for addressing them.

Common conducive conditions around Brisbane homes include: garden beds built up against the building perimeter, timber in direct ground contact, leaking irrigation systems, poor sub-floor ventilation, and landscaping timbers or tree stumps adjacent to the building.

Termite Activity in Roof Voids, Subfloors and Wall Cavities

Roof voids, sub-floor areas and wall cavities are common locations for termite activity that may not be visible from living areas. In roof voids, termites may be found in roof framing, rafters, ceiling joists and any timber in contact with the roof structure. In sub-floor areas, bearers, joists, stumps and flooring are all potential targets.

Wall cavities are a particularly challenging area because activity within them is not visible without invasive investigation. Moisture meter readings and thermal imaging can assist in identifying areas of elevated moisture or temperature variation that may indicate termite activity within wall framing, but these tools have limitations and are not a substitute for a thorough visual inspection of accessible areas.

Regular access to sub-floor and roof void areas for inspection purposes is important. Properties where these areas are inaccessible or obstructed present a higher risk because activity in these areas may go undetected for longer.

Why a Professional Termite Inspection Matters

A professional termite inspection provides a systematic assessment of accessible areas of the property, using a combination of visual inspection, moisture detection equipment and thermal imaging where appropriate. The inspector will assess all accessible sub-floor areas, roof void, internal rooms, external perimeter, garden areas and any outbuildings.

The inspection report documents any evidence of termite activity, termite damage, conducive conditions and recommendations for further action or monitoring. Where termite activity is found, the report will outline management options, which may include termite management treatments such as chemical soil barriers, physical barriers or monitoring and baiting systems.

Annual termite inspections are generally recommended for properties in South East Queensland, where termite pressure is high. Properties with known risk factors — previous termite activity, conducive conditions, older construction or proximity to bushland — may benefit from more frequent inspections. Your inspector can advise on an appropriate inspection frequency for your specific property.