Article posted on December 04, 2018

What Causes Termite Infestations?

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Brisbane resident, Sandra asks

“We’ve just bought a relatively new house, and we’re concerned about termites. What causes them and how can we be sure the house is safe?”


danny kelly pest imageGreat question Sandra. Having a good understanding of what can cause an infestation is the best way to prevent one. Here’s some advice we give to customers each and every day about causes and best prevention measures.

It should be noted that most of the common termite causes can be prevented. For most jobs we attend, the infestation has come about either through no termite protection in place, or mistakes made by the home owner – such as timbers stored up against the house, leaking hot water systems, concrete slabs poured without any consideration given to termites, (including renovations and extensions) as well as other things such as garden beds up against weep holes.

Let’s look at what home owners can do to protect their homes and prevent costly repairs.

Common causes

Foundational movement or “settling” of the property over time

cause termites cracks image

One of the main causes of termite infestations is building movement or settling of the foundations. Every building “moves” and every concrete slab will show signs of hairline cracks over a period of time. It’s a common misconception that people assume their home doesn’t have cracks because it’s new or well built, but if you go out into your garage and look closely at the concrete slab, 90% of homes will have small cracks in the floor.

Termites gain direct access to your property through these small cracks which are usually present within the bathroom, kitchen or even beneath the carpets of your bedrooms.


  • Be mindful of cracks appearing in external walls and flooring
  • Always invest in a regular termite inspection at least annually

Plumbing and electrical entry points

Another common cause for termite infestations are plumbing and electrical piping and conduit entry points within the home. This includes plumbing within the bathroom, laundry, shower, toilet, kitchen pipes and the main electrical conduit that comes in where the metre box is at the side of your house.

In addition to these hairline cracks, you have several main lines that transverse through the slab into your home. Over the years as your slab naturally moves or it dries and sets, the potential arises that very small cracks develop around these pipes or lines. Termites simply travel through the ground naturally looking for food and it’s through these small gaps where they reach the timber in your home.

It should be noted that you don’t need significant foundational movement, or settlement for cracks to develop. Termites literally only need a millimetre to gain an access point into your home.


  • Be mindful of cracks appearing in external walls and flooring
  • Ensure contractors aren’t creating potential entry points when performing work on your home
  • Speak with us before performing extensive plumbing or electrical work that requires trenching etc
  • Always ensure you protect your home with regular inspections

Stump end caps being cut or removed completely

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For houses raised on stumps, (either timber or concrete) we don’t recommend that you do any modifications the end cappings. We often see customers moving into a new home and cutting or modifying the end capping and in some cases, homeowners placing a latticework over the front purely for aesthetic reasons. End caps serve a purpose, and by cutting it off you’re providing a direct access point for termites to get into the house.


  • Don’t modify or remove stump end caps
  • Avoid latticework or other timber positioned between your homes foundation and the ground
  • Always ensure you protect your home with regular inspections

External wall cladding in contact with the ground

Another common one to avoid is extending the external weatherboard all the way to the ground. When customers undertake renovations, they use weatherboard that looks like rendering and they use this weatherboard sheeting to clad the external wall. They then extend it all the way down to ground level over the slab edge because it’s visually more appealing. Technically there should be a 75-millimetre clearance between the external sheeting and the ground, but when home owners fix the cladding in a way that extends all the way to the ground, termites just go straight up the back of the cladding and into the wall undetected.


  • Speak to us before performing extensive renovations
  • Avoid weatherboard or external sheeting that meets the ground
  • Always ensure you protect your home with regular inspections

Stored timbers against the home

timber against wall cause termites image

Another common cause for termites would be the storage of timbers, mulch, wood piles, logs and firewood. It’s not unusual to see timbers or firewood stored up against the side of a house or under the carport. This should be avoided and stored up on bricks or grey concrete blocks if possible. Two besser bricks and trestle planks would provide a great elevated storage platform.


  • Don’t store timber up against the house, or beneath the home where it’s likely to attract termites
  • Always ensure you protect your home with regular inspections

Renovations and extensions

If you are undertaking any home extensions, it’s really important to make sure that when builders pour the floor slab, the join where the old slab meets the new floor slab is correctly sealed. The new slab over time will dry and shrink creating a slight gap between the two slabs providing an opening for termites to come up through the ground. We often find that this joint is not sealed because its assumed carpet will be laid over it, however, it is from this point that termites will make a mud trail under the carpet towards the home walls.


  • Speak with us before performing any renovations or extensions. We’ve seen extensions torn down and completely removed because homeowners failed to comply with required pest control standards
  • Don’t pour concrete slabs up against old slabs without proper termite protection in place
  • Always ensure you protect your home with regular inspections

Common hotspots or culprits in attracting termites to your home

  • Installing a new timber deck, balcony or pergola where incorrect measures have been taken and timber posts, or stairs are in direct contact with the ground.
  • Raised garden beds that are situated directly up against the house wall, as well as gardens where the soil bed covers up the weep holes. This creates direct access for termites from the soil into your home and should be avoided.
  • A leaking hot water system where drip tubes continuously drip against the wall edge. Termites are attracted to this consistent daily water source and it’s from here they go under the slab and emerge through the gap or cracks into the house.
  • Another culprit in attracting termites are air conditioning drip tubes. During summer its common to have your air con operating all day and night. The drip tube that continuously leaks against the side of the wall creates a water source right against the house, which can attract termites
  • Spas with timber framing can often act as an attractant, because they combine moisture and timber. In particular, spas that leak, either onto soil or onto timber decking.

Found termites in your roof?

When you find termites in your roof cavity, it’s a common misconception to assume they have entered through gaps in roof tiles or cracks in the roof. In fact, the termites have simply worked from the ground up. When they reach the roof, that’s their highest point, so they will naturally just keep feeding in this area until the damage becomes visible.

The exception to this might be a leaking tile that creates internal water damage, which leaks down the pipes into the slab and onto the soil. So, when the termites find that moisture, they follow the water trail. Often termites go undetected because homeowners can’t see behind the wall lining. The same principle applies to a leaking shower or bathroom toilet – termites simply follow the source of water.

Concerned about termites in your home?

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Pest-Ex have been servicing Southeast Queensland for more than a decade. We service all areas of Brisbane, the Gold Coast, Logan and Tweed Heads. With more than 10,000 satisfied customers, it pays to work with professionals who provide the very best in pest control.

Give us a call today if you need assistance or advice.

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