The waterproofer who shows you the price by the m².
Sealline has waterproofed homes and buildings across Brisbane since 2010. In that time we learned the thing owners actually want is not the lowest number, it is an honest price they can see and a membrane that does not leak again. So we built the business around making both plain: the price on the screen, and the Standard, the system and the coats on the quote.
Most waterproofing fails before a single tile is laid. A single coat where the Standard needs two. A "we will seal it" with no system named. A membrane straight over a dusty, cracked substrate with no bond breaker at the junctions. Worst of all, no flood test, so nobody knows it leaks until the ceiling below it starts to stain. By the time you can see the problem, the membrane is under the tiles, the operator is long gone, and the warranty was never in writing.
Sealline started in 2010 after years cutting other people's failed waterproofing out of bathrooms and balconies. The founding idea was simple: write the quote so the Standard, the membrane system and the coats are impossible to hide, and put an honest by-the-m² range on the screen so an owner knows roughly what a bathroom or a balcony costs before booking anyone. The area, the Standard it meets, the system and the product, the number of coats, the prep and any strip-out, the flood test and the certificate. Each one a line. Put next to a cheaper quote, ours does not look dearer. It looks complete.
I would rather lose the job to an honest per-m² price than win it by sealing over a problem I cannot warrant. The wet areas I win on a quote that names the Standard are the ones still dry in ten years.
Today we waterproof internal wet areas to AS 3740, balconies and decks to AS 4654, roofs and podiums, basements and retaining walls, planters and water features, plus the remedial leak repairs in between, across Brisbane, with no travel surcharge within 30km of Murarrie. Every job is diagnosed first, built to the Standard, flood-tested, and warranted in writing.
Four things we will not compromise on.
We put the price on the screen
Waterproofing is the area by the m², by what is being waterproofed, by the system and the coats, so we show you an honest by-the-m² range named to the Standard before you book anyone. Then we inspect and pin the exact figure. We would rather lose a job to a fair number you can see than win it by hiding behind "every job is different, contact us".
It is built to the Standard, every time
AS 3740 inside a wet area, AS 4654 outside on a balcony, deck or roof. The coats the Standard needs, not one where it asks for two. The bond breakers at the junctions, the upturns to height, and the fall to drain set right. The Standard is what stops a membrane leaking, so it is the part we will not cut.
We name the system and the coats, never "we will seal it"
Cementitious, liquid-applied or sheet, the actual product named on the quote, and the number of coats stated. Not a vague lump sum that hides a single-coat surface seal behind a round number. You know exactly what membrane you are paying for before you sign, not after the tiles go down.
The leak is diagnosed before it is fixed
The stain is rarely under the leak, because water tracks along the structure and shows up somewhere else. So we trace where it is really getting in first, then quote the fix that holds, not the cheapest-looking one. Fixing the cause once is cheaper than sealing the symptom and watching it come back.
Who we are the right waterproofer for, and who we are not.
We would rather lose a job to a fairer fit than win one we will both regret. Here is who Sealline suits.
If you want the cheapest number on the street and you do not mind a single coat sealed over the junctions, we are probably not your waterproofer. If you want a job priced honestly by the m², built to AS 3740 or AS 4654, the membrane system and the coats named, flood-tested and certified, and the whole thing in writing with a 10-year membrane workmanship warranty, that is the whole business.
Licensed, insured, and happy to prove it.
Insurance
Public liability to $20M
Certificate of currency available before we start.
Licensed
QBCC licensed waterproofing
Built to AS 3740 inside and AS 4654 outside, flood-tested, and the compliance certificate issued.
Guarantee
10-year membrane workmanship
In writing, with exclusions named.
Method
QBCC Licensed Waterproofing
Licence 0000000
Method
Accredited membrane applicator
Manufacturer-accredited system, warranted
Waterproofing of wet areas is a licensed trade in Queensland: it needs a QBCC licence, and a licensed waterproofer is the one able to flood-test and issue the compliance certificate to AS 3740 or AS 4654. Sealline Waterproofing holds the licence and carries public liability insurance, so you are covered if anything goes wrong on site. Sealline Waterproofing is a composite reference site, so the licence numbers, ABN and contact details above are illustrative placeholders, not a real operator. On a live build these are the real, verifiable credentials of the business. Always ask to see the licence and the certificate before the tiles go down.
A small crew, not a call centre.
Dane Whitlock
Founder & lead waterproofer
Fifteen years cutting other people’s failed waterproofing out of bathrooms and balconies across Brisbane, the last decade watching the same shortcuts cause the same leaks: one coat instead of two, no bond breaker, no flood test. Started Sealline in 2010 to do it to the Standard, name the system on the quote, test it, and put the warranty in writing, every job.
“I would rather lose the job to an honest per-m² price than win it by sealing over a problem I cannot warrant. The wet areas I win on a quote that names the Standard are the ones still dry in ten years.”
Priya Naidu
Remedial & leak-detection lead
Runs the leak diagnosis and the remedial work, the shower re-seals and the balcony make-goods. Finds where the water is really getting in before anyone quotes a fix, because sealing the spot under the stain just wastes your money.
Sam Erickson
Quotes & scheduling
Runs the site inspections, builds the itemised quotes named to the Standard, and books the work. The reason you get a written quote within a business day and a call back when you say you want one.
What happens from first call to certificate.
Inspect and diagnose
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.
Strip out and prepare
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.
Detail the junctions
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.
Apply the coats
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.
Flood test
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.
Certify and hand over
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.
Want a waterproofing quote you can actually read? Start by pricing it.
Tell us what you need. We’ll book a walkthrough and send a quote with the work itemised, not just a number.