Dense clay brick has genuine pest-resistance advantages over timber and some cladded construction types but it’s worth understanding exactly how those advantages work, and where they don’t apply. The full picture is more useful for a homeowner making material decisions than a simple ‘bricks are pest-proof’ claim. This post covers how the main Australian pest types interact with brick construction, what recycled brick specifically offers, and what maintenance is still required. For a broader overview of the benefits of recycled brick, see our full benefits guide.
The Main Pests and How Brick Addresses Each
Termites
Termites are the most significant pest concern for Australian homeowners, and the relationship between termites and brick construction is commonly misunderstood.
What brick prevents: Termites feed on cellulose the organic compound in timber, paper, and plant material. Dense clay brick contains no cellulose, so termites have no reason to consume it. Solid brick walls do not provide food or habitat for termites in the way timber framing does.
What brick does not prevent: Termites can travel through mortar joints, wall cavities, expansion joints, and weep holes in brick veneer construction to reach internal timber elements roof timbers, floor joists, timber wall frames behind the brick facade. A brick-veneer home (brick exterior with internal timber frame, which describes the majority of Australian suburban homes) is not termite-proof and still requires termite management.
Where double-brick has an advantage: Solid double-brick or cavity brick construction with no internal timber frame eliminates the primary food source termites are seeking. This is a genuine structural advantage in high-risk termite areas. However, even solid brick construction requires inspection of any timber elements present – roof, window frames, joinery as these remain vulnerable.
Mortar joints and maintenance: Deteriorated or soft mortar joints can provide pathways for termite entry. Keeping mortar in good condition repointing any soft or crumbling joints is the most important brick-specific maintenance task for termite management. This applies to both recycled and new brick.
Borers
Wood-boring insects (including the common furniture beetle and various native species) target timber, not brick. Dense clay brick provides no habitat or food source for boring insects. The risk in a brick home is confined to any exposed timber elements: roof timbers, timber floors, window frames, and joinery. Brick exterior walls eliminate the most common entry points for borers in timber-clad construction.
Rodents
Rodents can breach most building materials given sufficient motivation a brick wall itself is not a barrier for determined rodents. What brick construction does reduce is the number of entry points: well-laid brick with sound mortar has fewer gaps than timber cladding, weatherboard, or fibre cement with multiple penetrations. Keeping mortar joints intact and weep holes screened (a standard practice in Australian brick construction) minimises rodent entry risk significantly.
Ants and Ground-Dwelling Insects
Ants, spiders, and similar insects are not structurally damaging, but they’re a common concern around brickwork particularly in garden settings. Brick itself doesn’t attract ants ant colonisation in brick edging or paving typically happens through soil contact at the base of brickwork, not because of the brick material. Good drainage around the base of brick garden features and keeping mortar joints filled reduces nesting opportunities.
Recycled Brick Specifically: Any Difference in Pest Resistance?
Recycled brick performs similarly to new brick of equivalent density in most pest-resistance contexts. A few genuine considerations:
- Density – older dense-fired clay bricks, including many recycled sandstock and red clay bricks, tend to be less porous than some modern bricks and concrete masonry units. Lower porosity means less moisture retention, which reduces the damp conditions some insects seek. This is a genuine advantage, though it varies by specific brick batch and firing quality.
- Existing mortar – recycled bricks come with old mortar residue that may be softer or harder than fresh mortar depending on its age and composition. When relaying recycled brick, use fresh modern mortar in joints rather than relying on old mortar remnants this ensures joint integrity for both structural and pest-management purposes.
- No treatment residues – unlike some new building products (treated timber, composite cladding with chemical binders), recycled clay brick contains no chemical treatments or organic binders that degrade over time or off-gas. This is a minor but relevant consideration in applications close to garden soil.
Brick vs Other Common Construction Materials: Pest Context
| Material | Primary pest risk | Brick advantage |
| Timber framing / weatherboard | High termite and borer risk – cellulose food source, multiple penetration points | Brick removes cellulose food source from external walls; double-brick removes it from wall structure entirely |
| Brick veneer (brick + internal timber frame) | Reduced but not eliminated termite risk — internal timber still present | Fewer entry points than full timber construction; termite management still required |
| Double / solid brick | Lowest structural termite risk – no timber in wall construction | Eliminates wall-structure cellulose entirely; roof timbers still require inspection |
| Fibre cement cladding | Low termite risk for wall material itself, but multiple panel joins and penetrations | Brick has fewer mechanical joins and penetrations than panel cladding systems |
Maintenance for Pest Management in Brick Homes
The brick-specific maintenance tasks most relevant to pest management:
- Repoint deteriorated mortar joints – soft or crumbling mortar is the main brick-specific termite entry risk. Inspect joints every 5–10 years, particularly at ground level and in exposed weathering areas, and repoint any deteriorated sections.
- Keep weep holes clear but screened – weep holes in brick veneer are essential for drainage but are also potential entry points. Stainless steel weep hole covers are standard in new construction and can be retrofitted to older brick homes.
- Maintain a clearance between soil and brickwork – ground-level soil contact with brickwork provides a direct termite pathway. A 75–150mm clearance between finished soil level and the lowest mortar joint is the standard recommendation. This applies in garden settings too brick edging and retaining walls that have soil against the base should be inspected regularly.
- Annual termite inspection – regardless of construction type, an annual inspection by a licensed pest inspector is the most reliable management measure for Australian conditions. This is not a brick-specific need, but it’s the most important single action homeowners can take and shouldn’t be omitted on the assumption that brick construction eliminates the risk.
Frequently Asked Questions
Can termites get through brick walls?
Termites do not eat brick clay contains no cellulose. However, they can travel through mortar joints, wall cavities, weep holes, and expansion joints in brick veneer construction to reach internal timber. Brick veneer homes are not termite-proof and should still be inspected annually. Double-brick or solid brick construction with no internal timber framing has a stronger case for termite resistance, but roof timbers and joinery remain vulnerable.
Is recycled brick more or less pest-resistant than new brick?
Recycled dense-fired clay brick performs similarly to new brick of equivalent density. The key variable is density and porosity denser, lower-porosity bricks retain less moisture, which marginally reduces the conditions some insects seek. Recycled sandstock and red clay bricks are often dense. What matters most in practice is the quality of mortar joints, regardless of whether the bricks are recycled or new.
Do I still need termite management if I have a brick home?
Yes, unless your home is solid brick with no internal timber framing, no timber roof structure, and no timber joinery which describes very few Australian homes. Most Australian brick homes are brick veneer, meaning timber framing is present internally. Annual termite inspection remains the most important pest management measure regardless of exterior wall material.
Does recycled brick work well for garden retaining walls and edging in terms of pest resistance?
Yes dense clay brick is one of the better choices for in-ground or soil-contact garden applications because it doesn’t degrade, rot, or provide cellulose to soil-dwelling insects the way timber sleepers do. Keep a clearance between soil level and mortar joints where possible. See our guides to recycled bricks for retaining walls and garden edging for construction detail.
Related Reading
- Why Choose Recycled Bricks? Benefits for Australian Homes
- Do Recycled Bricks Increase Your Home’s Resale Value?
- Recycled Bricks for Retaining Walls
To discuss brick grades and availability for your project, contact The Brick Pit or browse our recycled bricks range.
