From a single drummy tile to a full commercial waterproofing system — we diagnose the problem and apply the right repair, not the easiest one.
Loose and drummy tiles are one of the most common building maintenance problems in Queensland — and one of the most unnecessarily expensive to fix if you go straight to replacement. When the adhesive bond between a tile and its substrate fails, a void forms beneath the tile. It sounds hollow, it flexes under pressure, and water enters through cracked grout to make the problem spread.
Traditional rectification means demolition — removing the tile, preparing the substrate, sourcing a matching tile (which is rarely possible), and relaying. The result is always visible, always disruptive, and rarely necessary.
We drill small 2–3mm access holes along the grout lines adjacent to the affected tiles — never through the tile face. A specialised adhesive is then injected under controlled pressure into the void, filling the cavity completely and permanently rebonding the tile to the substrate. The access holes are filled with matching grout. The tile surface is untouched throughout.
Most areas are ready for foot traffic within 3 to 4 hours. The tiles look exactly as they did before we arrived — because nothing was removed, cracked, or replaced.
Concrete cracks. It's not a defect — it's an inherent property of the material. Thermal movement, structural settlement, construction shrinkage and load changes all produce cracking over time. The problem is what gets in through those cracks. Water carries chlorides that corrode reinforcing steel, the ice-thaw cycle (less relevant in FNQ, but still present) widens cracks progressively, and sustained moisture ingress weakens surrounding concrete from the inside out.
Left untreated, a hairline crack in a basement wall becomes an active leak. An active leak becomes concrete cancer. Concrete cancer becomes a structural repair bill that dwarfs what injection would have cost. We've seen this sequence play out repeatedly across FNQ, particularly in underground car parks and retaining structures.
When a crack is wet or actively leaking, polyurethane foam resin is the correct system. Hydrophilic polyurethane reacts with the moisture in the crack and expands — typically 5 to 10 times its original volume — filling the crack and surrounding voids with a dense, flexible, watertight seal. The expansion confirms the material is working and provides visible evidence of fill. The flexibility of the cured foam accommodates ongoing building movement without re-cracking the seal.
For dry structural cracks where the goal is to restore load-bearing capacity rather than just seal water, epoxy injection is the correct system. Epoxy cures into an extremely high-strength rigid bond — often stronger than the surrounding concrete. It's the right choice for structural columns, beams and elements where movement is not expected and compressive strength matters.
Injection saves 60–70% over excavation. Most concrete leaks that would traditionally require excavation and external membrane application can be sealed from the inside using injection — faster, cheaper, and without shutting down the building.
Flat and low-pitch roofs face conditions in Far North Queensland that would stress any waterproofing system: wet season rainfall measured in metres rather than millimetres, UV intensity at the top of the Australian scale, and the relentless thermal expansion and contraction that goes with 35-degree summer days followed by cooler nights.
When a roof membrane fails — whether through UV degradation, poor initial installation, physical damage or simple age — the cost of what follows is always larger than the cost of addressing it early. Water that enters through a roof membrane doesn't stay in the roof. It tracks along structural elements, saturates insulation, damages ceilings, ruins internal finishes and creates mould that is expensive and disruptive to remediate.
Liquid membranes are applied by brush, roller or airless spray and cure into a continuous, seamless rubber-like coating that conforms to any roof shape — irregular profiles, multiple penetrations, complex upstands and flashing details. High-performance polyurethane formulations stretch up to 280% before tearing, accommodating significant thermal movement without cracking. They're our first choice for roofs with complex geometry or ageing substrates where sheet membrane detailing would be difficult.
For large, simple flat roof areas, prefabricated sheet membranes — TPO, EPDM or torch-on bituminous systems — provide highly consistent thickness, excellent UV resistance and long service life when correctly installed and fully detailed at seams, upstands and penetrations. Seams are where sheet membranes fail — correct heat welding or bonding of laps is critical and non-negotiable.
Not every roof situation requires a full strip and relay. We assess existing membrane condition for recoating potential, spot-repair feasibility and localised re-detailing — extending service life without the disruption and cost of a full system replacement where the membrane still has life in it.
Balconies are one of the highest-risk waterproofing locations in any building — and in Queensland and Far North Queensland specifically, they fail at a higher rate than in southern states. The combination of intense wet season downpours, year-round UV, high humidity and frequent thermal cycling creates conditions that break down membranes, crack grout, and stress sealant joints faster than anywhere else in the country.
The particular problem with balconies is what's below them. A leak on a ground-level patio is inconvenient. A leak on a balcony above occupied rooms, or above another apartment in a strata building, causes ceiling damage, internal wall damage, mould, and — if it reaches structural elements — concrete cancer. By the time it becomes visible internally, the damage is usually already significant.
The most common causes we see across FNQ are: UV degradation of the membrane coating over time, inadequate upstand detailing at wall junctions (the most common point of entry), failed silicone in movement joints that have expanded and contracted through hundreds of thermal cycles, and inadequate slope to drain — water pooling on a balcony puts sustained pressure on any membrane system.
For tiled balconies where the membrane beneath has failed, full strip-out and relay is not always the only option. In some cases we can access and repair the membrane through the grout lines using injection techniques — sealing the leak without lifting all the tiles. We assess this possibility on every tiled balcony job before recommending full demolition.
Where the membrane needs full replacement, we strip back to the structural substrate, repair any damage, re-establish correct fall to drainage, and install a new membrane system specified for tropical UV and wet season conditions — with particular attention to upstand detailing, drain flashings and movement joints where failures almost always begin.
Queensland regulations: Waterproofing in Queensland is a regulated trade under the QBCC. All our waterproofing work is performed by licensed waterproofers — not general builders adding it to their scope. If a contractor can't show a waterproofing licence, walk away.
Commercial waterproofing work demands a different approach to residential. Occupied buildings can't be shut down for a week. Strata properties have body corporate requirements and multiple stakeholders. Hotels need work done around guest schedules. Retail centres have trading hours. Industrial facilities have operations that can't stop.
We've been working in commercial environments across FNQ since 2005 and understand how to plan and execute waterproofing work with minimal impact on the building's operations — section by section if needed, out of hours where required, and with full coordination with building managers and facility teams.
All commercial work is performed by licensed waterproofers under current QBCC licensing. We can provide scope-of-works documentation, completion reports and product warranties where required for strata and body corporate purposes.
Failed grout and degraded silicone joints are the most common — and most easily prevented — water entry point in wet areas. Grout that is cracked, crumbling, missing sections or heavily stained is no longer performing its function as a water barrier. Water enters the void, saturates the adhesive layer beneath the tiles, and begins the process of bond failure that leads to drummy tiles. In a bathroom, that same water is attacking the waterproofing membrane below.
Silicone joints at internal corners, junctions between tiles and fixtures, and around door frames and windows have a finite service life. In Queensland's UV and heat, external silicone degrades faster than the industry's nominal 15-year service life would suggest. Cracked, peeling or moulded silicone is not a cosmetic problem — it's a water entry point.
We use high-quality flexible grout and sanitary-grade silicone appropriate to each application — the right product for the joint movement, UV exposure and substrate involved. Not hardware-store tube silicone.
We prefer injection — it's less disruptive, less expensive, and leaves the original tiles intact. But injection isn't the right answer for every situation, and we'll tell you honestly when replacement is the better call.
Replacement is the correct approach when tiles are cracked rather than just loose, when the substrate beneath is deteriorated or contaminated, when the waterproofing membrane below has failed and needs replacement before new tiles can go down, or when the scope of failure is widespread enough that full relay is more economical than injection point by point.
The most common problem with tile replacement work across the industry is that it treats the symptom and ignores the cause. Tiles are removed, new tiles go down over the same failed substrate or failed membrane, and within a few years the problem returns. We do it differently: the substrate is properly assessed and repaired before any tile work, and where waterproofing is involved, the membrane is renewed before the tiles go back. You get a result that lasts.
Retaining walls face a specific and relentless challenge: sustained hydrostatic pressure from the soil and water behind them. Unlike a building wall that faces weather intermittently, a retaining wall is in constant contact with saturated ground — particularly in FNQ where the wet season delivers intense, sustained rainfall over months. Without adequate waterproofing and drainage relief, water finds its way through porous concrete, cracks, and construction joints, causing the efflorescence, staining, concrete cancer and eventual structural failure that are common in older FNQ retaining structures.
We assess the wall condition, water pressure and drainage situation before recommending a system. Active cracks and leaking joints are sealed by injection. Faces are waterproofed using crystalline, cementitious or membrane systems depending on access and substrate. Critically, we also address drainage — waterproofing a retaining wall without relieving the hydrostatic pressure behind it is at best a temporary measure. Weepholes, drainage cells and subsoil drain systems are often part of the solution.
White deposits on your retaining wall? Efflorescence — the white crystalline salt deposits that appear on concrete and masonry — is caused by water moving through the structure and depositing dissolved minerals on the surface. It's a reliable indicator that water is penetrating and the concrete is deteriorating. Don't ignore it.
Some of the most damaging moisture problems in a building are invisible at the surface. Water moving beneath floor coverings — through failed membranes, cracked screeds or deteriorated substrate layers — causes adhesive failure, mould growth, laminate lifting, timber swelling and progressive substrate degradation that worsens with every wet season before anything becomes visible at floor level.
By the time tiles start going drummy, laminates start lifting, or carpet starts smelling, the moisture has usually been present for some time. Treating the surface without identifying the path and source of that moisture means the same problem returns — typically faster than the first time.
We use moisture detection to trace the movement of water through the floor structure — identifying where it's entering, how it's tracking, and what the source is. That might be a failed bathroom membrane leaking laterally through the screed, a plumbing penetration that was never properly sealed, a slab that is absorbing ground moisture from below, or a combination of causes. Once the source is confirmed, we recommend the appropriate repair — which may be injection, membrane renewal, screed replacement, drainage correction or a combination.
Tell us what's happening — we'll assess it, diagnose the cause, and give you a straight recommendation. No obligation, no sales pressure. Over 20 years in FNQ.
