Licensed and insured, waterproofing across Brisbane since 2010
Brisbane
Internal wet areas, balconies and decks, roofs and podiums, basement tanking and remedial leak repair across Brisbane.
Lic. QBCC 0000000 · Public liability to $20M
Our response promise
A written, itemised quote within one business day, and we answer the phone.
We turn up when we say we will, and we never leave an enquiry sitting. A leak gets looked at fast, because a leak does not wait.
Why homeowners pick us
You cannot get a price, only a lump sum
Every other waterproofer hands you a vague lump sum and hides the system entirely. Waterproofing is genuinely estimable: it is the area, by what is being waterproofed, by the membrane and the coats. So we put an honest per-m² range on the screen first, named to the Standard. Then we inspect and pin the exact figure.
Nobody names the Standard
Internal wet areas are waterproofed to AS 3740, balconies and roofs to AS 4654, and the Standard sets the coats, the bond breakers and the falls. Most quotes treat it as a footer or leave it off. We name it on the page, because it is the only way you can check the job is the same one you are comparing.
The cheap fix cracks and leaks again
A low number usually means a single coat where the Standard needs two, no bond breaker at the junctions, and no flood test. It looks done the day the tiles go on and it leaks again within a year or two, which means paying twice. We detail it to the Standard, flood-test it, and warrant the membrane for 10 years.
Internal wet areas, balconies and decks, roofs and podiums, basement tanking, remedial leak repair, and planters. Each one quoted the same honest way: by the m², named to the Standard, the system and coats named, flood-tested and certified.
Above-ground balconies and decks waterproofed to AS 4654, with the fall to drain and the upturns detailed right so water leaves instead of pooling.
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Exposed and buried membranes on roofs, podium decks, planters and trafficable terraces to AS 4654, in the system that suits the exposure and the traffic.
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Below-ground tanking for basements and retaining walls, built to hold back negative water pressure instead of just painting over the damp.
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Leak diagnosed first, then a shower re-seal or membrane make-good, so we fix the cause once rather than seal over it and watch it leak again.
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Planter boxes, ponds and water features tanked and detailed so constant standing water and root pressure do not find their way into the structure.
Get a quote →Pick what you are waterproofing, the area and the system, and get an honest supplied-and-installed range in under a minute, named to AS 3740 or AS 4654. It is free, it stores nothing, and it runs in your browser. It is a guide range, not a quote: the site inspection pins your exact number.
Before 
After 
Before 
After 
Before 
After The flood test is a real step, not an afterthought. It proves the membrane holds before anything goes on top.
We look at the job and, for a leak, trace where the water is actually getting in, because the stain is rarely under the source. We check the falls, the substrate and the detailing before we quote anything.
Where the old membrane or tiles have failed, we strip them back. Then we grind, repair cracks, and prime the substrate, because a membrane is only as good as what it is stuck to.
Bond breakers at the wall-to-floor corners, the upturns to height, the penetrations and wastes sealed in, and the fall to the drain set right. The junctions are where a wet area moves and where it leaks.
The membrane system to AS 3740 or AS 4654, the number of coats the Standard needs, each cured before the next. We name the system and the coats on the quote, and apply exactly that.
We plug the wastes, flood the area, and leave it to confirm the membrane holds water before anything goes on top. The test is the proof, and it is a real step, not an optional extra.
We issue the compliance certificate for the work and hand over the membrane warranty in writing, so your builder, certifier and insurer have the paperwork the job needs.
A waterproofing quote that names the Standard it answers to, the membrane that goes down, and the test that proves it. Not a number by text.
A vague lump sum with no m², no membrane system named and no coats is the warning sign, not the number itself. Here is everything that is in ours.
The membrane turning up the wall a full 150mm, the bond breaker at the junction so the substrate can move without tearing the membrane, fall to the drain to AS 3740, and water beading on the cured surface. Each of these is a line on the quote, and a step on the flood-test certificate.
A leaking shower, a balcony weeping through the grout, or a single junction gone. We diagnose the source, then re-seal or make-good the membrane, often without a full strip-out where the substrate is sound.
A bathroom, ensuite, laundry, balcony or deck waterproofed to AS 3740 or AS 4654 before the tiles go on. The substrate prepped, the junctions detailed, the coats applied, then flood-tested and certified. The job we do most.
Exposed and buried membranes on roofs, podium decks, trafficable terraces and planters, to AS 4654, coordinated with the builder or body corporate. Our commercial and strata path.
Below-ground tanking for basements and retaining walls, built to hold back negative water pressure with a cementitious or specialised system, not painted over and hoped for.
The membrane workmanship layer is the one a cheap operator will not put on paper, and the one we lead on.
10 years on the membrane workmanship, in writing. The part that fails first when it is rushed, and the part a cheap operator will not warrant: if our membrane fails in that time, we put it right. This is the waterproofing-specific lever.
The membrane manufacturer warranty on the accredited system, valid because we are an accredited applicator and install it to spec, with the coats and the detailing the system calls for.
Services rendered with due care and skill for a reasonable period under Australian Consumer Law. Always applies, on top of the two layers above.
The QBCC licence, the liability, and the membrane workmanship warranty, all named up front.
A QBCC waterproofing licence, the licence that lets us flood-test and issue the compliance certificate. A cash job with no licence cannot certify the work, and leaves you exposed.
QBCC
Cover for your property and anyone on it, for the length of the job.
$20M
A 10-year written warranty on the membrane workmanship, the part that fails first when a job is rushed.
10 yr
The same crew that inspects and quotes your job installs the membrane to the Standard, then flood-tests it and issues the certificate.
A site inspection, the leak traced to its source, and an itemised by-the-m² quote named to the Standard in your hands.
Substrate prepped, junctions and falls detailed, the membrane system and the coats applied to AS 3740 or AS 4654.
The work flood-tested, the compliance certificate issued, and a 10-year membrane workmanship warranty in writing.
Wall of love
★★★★★ 4.9 average 160+ Google reviews
“Three quotes, and Sealline was the only one that traced where the water was actually coming from before quoting. The stain was nowhere near the leak. They stripped the ensuite, re-membraned it to AS 3740, flood-tested it and gave us the certificate. Dry for a year now.”
“Our balcony was bubbling and the ceiling below was staining. Priya found the falls were running back toward the house. They corrected the fall, re-membraned to AS 4654 and detailed the drain properly. The number on the quote was named by the square metre, no vague lump sum.”
“New build, two bathrooms and an ensuite. Sealline did them all to AS 3740, named the system and the coats on the quote, flood-tested each one and handed over the certificates so the build signed off without a hitch. Easy to deal with.”
“We are a body corporate with a leaking podium deck over the car park. They scoped it, staged the work around residents, and re-membraned the buried sections to AS 4654. The certificate and the warranty went straight into our building file.”
“Our basement was damp every wet season and the last mob just painted it. Sealline assessed where the water was coming from and tanked it from the inside with a proper negative-pressure system. First wet season since and it is dry.”
“Tiny heritage bathroom in a Queenslander, and they still did it properly: bond breakers at the corners, the upturns to height, flood-tested before the tiler came back. The quote named the Standard, which none of the others bothered to do.”
“Bayside balcony taking all the salt. They talked us through which membrane stands up to the exposure, did it over the sound tiles where the leak was just the grout, and saved us a full strip-out. Honest about what it did and did not need.”
“Water was coming through a downstairs ceiling and nobody could work out from where. Sealline traced it to a cracked deck membrane two rooms over, not the bathroom we all assumed. Fixed the actual cause once. Worth every cent of the diagnosis.”
“Render kept blowing off the wall behind our courtyard planters. They emptied them, re-tanked with a membrane rated for constant water, detailed the drainage and reinstated them. No more damp wall behind. Tidy, careful crew.”
Eight short videos: the FAQ, what waterproofing costs, how we work, who you are dealing with, and a full job from first call to certificate.
Cost per m², which Standard applies, fixing a leaking balcony without removing tiles, how long a membrane lasts, whether we test and certify, and whether we are licensed. Ten minutes here saves an argument later.
Tell us what you need. We’ll book a walkthrough and send a quote with the work itemised, not just a number.
