Physical Termite Barriers Sydney
Planning a new home, extension or renovation? Arrange a review of your termite protection before the relevant construction stages begin.
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How Physical Termite Protection Works in Sydney Homes
Most of Sydney is an area where subterranean termites are a known risk. They travel through soil and look for concealed routes into a building, such as shrinkage cracks in the slab, construction joints, gaps around plumbing and electrical penetrations, and wall cavities.
A physical termite barrier uses a material termites can’t readily pass through or chew through. Depending on the system, that might be marine-grade stainless steel mesh, graded stone or a polymer sheet. These barriers are designed to restrict concealed entry through the areas they protect. Depending on the system and building design, termites may still find a way around a barrier, so regular inspections remain important. A barrier doesn’t make a building termite-proof.
Most physical systems are best installed during construction, because many of the places they protect are covered by concrete once the slab is poured.
Types of Physical Termite Barriers
Stainless Steel Termite Mesh
Marine-grade stainless steel mesh with openings too small for termites to pass through. It's used around pipe penetrations, slab joints, perimeters and cavities, and contains no termiticide. The edges and joins must be fitted to the manufacturer's details.
Graded Stone Barriers
Crushed granite graded to a particle size that termites can't move or squeeze between. It can be laid beneath the slab, around penetrations or along the perimeter. It's chemical-free and suits new builds on level sites.
Termite Membranes and Collars
Polymer sheets and pre-formed collars used under the slab, at the slab edge, in cavity walls and around service penetrations. Many products are impregnated with a termiticide, so they work as both a physical and a chemical barrier.
Non-Chemical Termite Barriers: Which Systems Are Chemical-Free?
Physical barriers are often described as chemical-free, but that’s only true for some of them.
Stainless steel mesh and graded stone rely only on the material itself, with no termiticide involved. They’re the systems to ask about if a chemical-free approach matters to your household.
Most termite membranes, and some collars, are impregnated with a termiticide such as deltamethrin or bifenthrin, depending on the product. They still block termites physically, but they’re not chemical-free.
Many new Sydney homes combine physical components with a chemical system. Your builder or certifier can confirm what’s specified for your site, and the product documentation will state whether a system contains a termiticide.
Pre-Construction Physical Termite Barriers: How Installation Fits Your Build
Plan Review
The plans, slab design and services layout are checked against the termite management system specified for the project.
Site Assessment and Quote
A written quote sets out the system, what’s included and the construction stages each part depends on.
Before the Slab Pour
Under-slab and penetration components, such as mesh, collars, graded stone or membrane, are fitted once the plumbing is in and before the concrete is poured.
Wall and Perimeter Stage
Cavity or slab-edge components, where the system includes them, are fitted as the walls go up.
Records for Your Certifier
Installation details are recorded for the certifier, and the system is listed on the durable notice for the home.
Physical Termite Protection for New Builds, Extensions and Existing Homes
New Homes and Knockdown Rebuilds
A new build is the best opportunity for physical protection, because every penetration and joint is accessible before the slab is poured. Plan the barrier into the build program early, as missed stages usually can’t be repeated.
Extensions and Granny Flats
The weak point in an extension is where the new slab meets the existing building. The barrier needs to protect the new slab and the junction between the two, so the join doesn’t become a hidden entry route.
Existing Homes
Physical barriers usually can’t be installed under an existing slab. Options are limited to accessible areas, such as exposed penetrations or parts of the home opened up during renovations. For most established homes, chemical termite barriers and reticulation are the practical choice.
How Long Do Physical Termite Barriers Last?
The expected service life depends on the barrier system, how it was installed and whether it stays intact. Renovations, new service penetrations, garden beds against the walls and changes around the slab edge can all compromise protection.
Follow the maintenance guidance for your system and arrange regular termite inspections. The recommended inspection frequency for a new home is recorded on its durable notice.
Physical Termite Barrier Requirements for NSW Homes
New Homes and Building Work
The National Construction Code (Housing Provisions Part 3.4) requires a termite management system for new homes and garages in areas where subterranean termites are a known risk, where primary building elements such as the timber frame are susceptible to attack. The acceptable system types depend on the floor construction, and can include sheet materials, granular materials such as graded stone, and chemical systems.
The system must comply with AS 3660.1, the Australian Standard for termite management in new building work, or have passed the tests set out in AS 3660.3. Not every new home needs the same type of barrier. Your builder or certifier confirms what applies to your project.
The Durable Notice
For new building work, the NCC requires a durable notice fixed in a prominent place such as the meter box. It records the termite management system used, the date of installation, and the installer’s or manufacturer’s recommendations for future termite inspections. For chemical systems, it also records the product’s life expectancy.
Existing Homes
Termite management for existing buildings is covered by a separate standard, AS 3660.2, which deals with inspections and treatment around homes that are already built.
Physical termite protection for Sydney homes, extensions and granny flats, planned around your build stages.
Keeping Your Physical Barrier Working
A physical barrier only protects your home while it stays complete. Most problems start after handover, when something is added, dug or built around the house.
Keep the Slab Edge Visible
Keep soil, mulch, paving and render off the exposed slab edge, so termite activity can be seen during inspections.
Protect New Penetrations
Any new pipe or conduit through the slab needs to be protected to keep the barrier complete.
Don't Bridge the Barrier
Decks, steps and pergolas fixed to the house can give termites a route around the barrier.
Fix Leaks and Drainage
Damp soil beside the house attracts termites, so repair leaking taps and downpipes promptly.
Keep Your Records
Store the durable notice details and installation records with your home documents. Future buyers and inspectors will ask for them.
Book Regular Inspections
Follow the inspection frequency on your durable notice. Inspections can pick up bridging and damage early.
Physical Termite Barriers Across Sydney
Physical termite protection is planned for new homes, extensions and renovations across greater Sydney.
North West Sydney
New estates and house-and-land builds across Box Hill, Marsden Park and the Hills District.
South West Sydney
New homes and granny flats in growth areas such as Oran Park and Leppington.
Upper North Shore and Northern Beaches
Knockdown rebuilds and major renovations on established blocks.
Inner West and Eastern Suburbs
Extensions and rear additions to terraces and older homes.
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Physical Termite Barrier FAQs
Are physical termite barriers better than chemical barriers?
Neither is better in every case. Physical barriers don’t need replenishing, but they’re mostly installed during construction. Chemical barriers suit existing homes because they can be applied around a finished building. Many new homes use both.
Are physical termite barriers chemical-free?
Can a physical termite barrier be installed in an existing home?
Do physical termite barriers stop termites completely?
When should a physical barrier be installed during a build?
Is a termite barrier required for new homes in NSW?
What is a durable notice?
How much do physical termite barriers cost?
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