How Do Termites Enter Your Home?

Termites cause more damage to Australian homes than fire, floods, and storms combined. Yet despite the scale of the problem, most homeowners have little idea how termites actually get inside. They do not fly in through open windows. They do not walk up the front path. They enter quietly, underground, through gaps and weaknesses that are often invisible to the untrained eye.

Understanding how termites enter your home is the first step toward preventing them from doing so. In South East Queensland, where the Gold Coast and Brisbane sit among the highest-risk termite regions in Australia, this knowledge could save you tens of thousands of dollars in structural repair costs.

Here are the most common termite entry points found in Queensland homes, and what you can do about each of them.

How Termites Travel: Underground and Out of Sight

The termites responsible for the vast majority of structural damage in Australian homes are subterranean species, primarily Coptotermes acinaciformis and Schedorhinotermes species. These termites live in underground nests and travel through a network of soil tunnels to reach food sources. When they are forced to move above ground level, they construct mud shelter tubes from soil, saliva, and faeces to protect themselves from light, air, and predators.

Termites can squeeze through a gap as small as 2mm. They do not need a large opening. They need a concealed one, a pathway into your home that is hidden from sight and protected from the elements. This is exactly why many termite infestations go undetected until substantial damage has already occurred.

1. Cracks in the Concrete Slab

For the majority of Gold Coast and Brisbane homes built on a concrete slab, the slab itself is one of the most common termite entry points. Concrete is not a termite-proof material. Over time, slabs develop cracks due to soil movement, settling, and temperature fluctuations. Cracks can also form at construction joints, cold joints, and around pipe penetrations.

Termites can exploit a crack as small as 0.5mm. Once through the slab, they have direct access to the timber framing above without ever being visible from outside the building.

What to watch for: Hairline cracks along internal floors, particularly near wet areas and pipe penetrations. Any crack in the slab edge that is visible from outside should be assessed during an annual inspection.

2. Pipe and Service Penetrations Through the Slab

Every home built on a concrete slab has a series of plumbing, electrical, and telecommunications penetrations passing through it. At each of these penetrations, there is a potential gap between the pipe and the surrounding concrete where termites can pass through undetected.

These penetrations are supposed to be protected at the time of construction with physical collars or chemical barriers. In practice, protection is sometimes incomplete, poorly installed, or deteriorates over time. In older homes, original penetration protection may be absent entirely.

What to watch for: Wet areas where pipe penetrations are located, including under kitchen sinks, bathroom vanities, and laundry tubs, are worth examining annually. Any soft timber, discolouration, or mud-like material near these areas warrants immediate professional inspection.

3. Concealed Slab Edges

Australian Standard AS 3660.2 requires that the edge of a concrete slab be kept visible as an inspection zone, with a minimum clearance so that a pest inspector can see whether termites are attempting to build shelter tubes up the slab edge and into the home.

In practice, this zone is one of the most frequently compromised elements of termite management on Gold Coast and Brisbane properties. Garden beds built against the external walls, paving laid flush with or above the slab edge, render applied down to ground level, and timber decking constructed over the slab perimeter all create concealed pathways that termites can use to enter the building without detection.

What to watch for: Check that the bottom of your external walls is visible and clear of soil, mulch, garden beds, and paving. If you cannot see the junction between the slab or foundation and the wall framing from ground level, termites may be able to access the same area without you knowing.

4. Subfloor Access in Raised Homes

Homes built on timber or masonry piers, which are common in older Gold Coast and Brisbane suburbs, have a subfloor space that gives termites direct access to the underside of the flooring system. Termites can travel up the outside of brick or concrete piers via mud tubes, across bearers and joists, and into the structural timber of the floor.

Metal ant capping installed on top of piers is designed to force termite shelter tubes out into the open where they can be seen during an inspection. However, ant capping that is damaged, improperly installed, or obstructed by stored items in the subfloor loses its effectiveness. Termites can also travel up through hollow masonry piers entirely hidden from view.

What to watch for: If you have a subfloor, inspect it annually. Look for mud tubes on piers, walls, and timber members. Ensure the subfloor is accessible and that nothing is stored against piers or walls that would block a thorough visual inspection. A clearance of at least 400mm between the soil and the underside of bearers is required under the building code.

5. Weep Holes in Brick Walls

Weep holes are small rectangular openings in the brickwork of external walls, typically located at the base of the wall. They exist to allow moisture to drain from wall cavities and to provide ventilation. They are also a direct opening into the wall cavity from outside.

Termites regularly use weep holes as an entry point. They construct shelter tubes within the cavity itself, making the activity invisible from outside. By the time termite damage is discovered internally, the colony may have been working within the wall for a considerable period.

What to watch for: Weep holes should be checked during an annual termite inspection for any signs of mud or shelter tube material. Mesh weep hole covers can reduce insect entry without compromising drainage and ventilation.

6. Timber in Direct Contact with Soil

One of the most straightforward termite entry points is also one of the most common on Gold Coast properties: timber that touches the ground. Garden retaining sleepers, fence posts set directly into soil, decking posts without metal stirrups, pergola footings, and formwork timber left in the ground after construction all give termites a direct, concealed pathway from the soil into structural timber.

Termites travel up through the interior of timber in soil contact without ever building a visible mud tube. By the time the timber shows external signs of damage, they may already have transferred their activity into the main structure of the home.

What to watch for: Any timber in contact with or close to the soil around your property should be treated as a risk. Decking and pergola posts should be set on metal stirrups above concrete footings. Garden sleepers within 300mm of the building structure warrant particular attention.

7. Attached Structures: Decks, Pergolas, and Garages

Attached structures create one of the most commonly overlooked termite entry points in Queensland homes. When a deck, pergola, or garage is built against the main dwelling, it can bridge the inspection zone and create a concealed pathway into the primary structure.

Termites can travel underneath a deck or within a garage wall cavity and access the home at points that are never visible during a normal inspection. Garages built with timber framing and direct slab contact, without appropriate barrier systems, are particularly vulnerable.

What to watch for: Any attached structure built after the original construction of your home may not have equivalent termite protection. If a deck or pergola has been added without a termite inspection and appropriate barrier treatment, it represents a potential entry point that should be assessed.

8. Moisture as the Master Attractant

While the entry points above represent the physical pathways termites use, moisture is the underlying reason they target certain homes over others. Subterranean termites require moist soil conditions to survive and are strongly attracted to properties where moisture accumulates at or near the foundation.

Leaking showers, dripping taps, air conditioning overflow pipes discharging near the foundation, blocked gutters, poor drainage in garden beds, and leaking plumbing under the slab all create localised moisture conditions that draw termite activity toward the building. In Queensland’s humid climate, even homes without obvious leaks can develop moisture accumulation in poorly ventilated subfloor spaces and wall cavities.

Addressing moisture is not a substitute for a chemical barrier or bait system, but it significantly reduces the attractiveness of a property as a termite target and supports the effectiveness of any treatment in place.

Why Annual Inspection Is the Only Reliable Protection

No matter how well a home is built, how many of the above conditions are managed, or what barrier system is installed, annual professional inspection remains the minimum standard required to protect a Queensland home. Australian Standard AS 3660.2 recommends at least one inspection per year, and more frequently for high-risk properties near bushland or with previous termite history.

Pest-Ex’s termite inspections use Termatrac radar, FLIR thermal imaging cameras, and moisture meters to detect activity in wall cavities, subfloor spaces, and roof voids without destructive investigation. These tools identify the early stages of termite activity before structural damage occurs, and before treatment becomes an expensive and disruptive process.

Protect Your Home Before Termites Find Their Way In

Termites are found in the soil around most Gold Coast and Brisbane properties. The question is not whether they will find your home, but whether they will find a way in. Understanding the entry points described above, maintaining clear inspection zones, addressing moisture issues, and booking an annual professional inspection are the four most effective steps any Queensland homeowner can take.

Call Pest-Ex today on 1300 915 743 or book online at pest-ex.com.au

Same-day bookings available across the Gold Coast, Brisbane, Tweed Heads, and Logan City.