From a single leaking bathroom to a full balcony re-waterproof, we do it properly the first time across Thornleigh – licensed, certified and guaranteed for 7 years.
Thornleigh NSW 2120
Need dependable waterproofing in Thornleigh? Our licensed team provides expert Thornleigh waterproofing for houses, apartments, townhouses and commercial buildings. We repair leaking bathrooms, balconys, laundrys and more using proven membrane systems, with every job backed by a written 7-year warranty.
Like much of the upper North Shore and Hornsby area, Thornleigh is a mix of family homes on leafy streets to units. Whatever the building, water finds the weakest point – a cracked grout line, a failed door sill, a blocked outlet or an unsealed joint – and the damage often shows up a long way from where the water gets in.
Because we hold Waterproofing Licence 36763C and certify our work to Australian Standards, our waterproofing is recognised by insurers, certifiers and strata committees – and it’s covered by a written 7-year warranty.
From inside the bathroom to the roof and below ground, we waterproof it all in Thornleigh. These four services are the ones we’re asked for most often.
Showers & en-suites
Most bathroom leaks start at the same few weak points: cracked grout, a poorly sealed floor waste, or a membrane that stops short at the wall. We find exactly where water is escaping and fix it – with tile injection when the tiles are sound, or a new membrane when they’re not.
Terraces
Balconies fail at the door sill, the drain and the balustrade fixings. Once water gets past the membrane it stains the ceiling below, lifts tiles and leaves white efflorescence on the soffit. We strip and re-waterproof balconies in Thornleigh with UV-stable external membranes to AS 4654.
Laundries
A laundry needs the same protection as a bathroom. We seal the floor, perimeter upturns and penetrations properly so water from machines, tubs and mopping can’t reach the structure.
Retaining walls
Basements, garages and retaining walls hold back wet soil every day. Without a working membrane and drainage, water pushes through walls, slabs and joints. We waterproof Dincel, block and retaining walls on new builds in Thornleigh and repair seepage in existing basements.
Remedial roof membranes for homes, apartments and commercial buildings, built to handle UV, heat and heavy downpours.
Long box gutters overflow inside when their lining fails. We seal gutters and outlets to keep water on the outside.
Positive and negative-side membranes for lift pits that sit below the water table, on new builds or as a remedial fix.
Concrete and screed floors waterproofed for wet areas, ground floors and commercial spaces where water must stay out of the slab.
Shower leaking but tiles still solid? Resin injected through the grout lines can seal it in a day, without a full renovation.
Garden beds built against walls and over slabs are a common hidden leak. We waterproof and drain them properly.
Brick walls, parapets and chimneys sealed against rising and penetrating damp to stop salt damage, flaking render and mould inside.
Pool and spa waterproofing that stops water escaping into the surrounding ground, paving and structure.
Our inspection finds the real source of a leak first, so you only pay to fix what's actually failing.
Every Thornleigh job is done under Waterproofing Licence 36763C, so the work is recognised by insurers, certifiers and strata committees.
A free written quote that explains what’s wrong, the system we’ll use and the price – no surprises when the job is done.
Our waterproofing comes with a 7-year written warranty – long after the tiles go down, we still stand behind the work.
Water rarely shows up where it gets in. A free inspection traces the leak to its source before we quote, so you pay to fix it once.
Wet areas are waterproofed to AS 3740 and outdoor areas to AS 4654, and you receive a compliance certificate when we finish.
We work for homeowners, landlords, builders, strata managers and businesses across Thornleigh and nearby suburbs.
Water damage gets more expensive the longer it runs. If you notice any of these, book a free inspection.
The bond has failed because the bed underneath is wet.
Water is sitting behind tiles or inside the wall cavity.
A bathroom, balcony or roof above is leaking through the slab.
Efflorescence means water is moving through the masonry.
Water is wicking out of a wet area into the timber next to it.
Groundwater is getting past below-ground walls or joints.
How every waterproofing job in Thornleigh runs, from first call to final certificate.
We visit your Thornleigh property and trace the leak to its source.
A written, itemised quote with no obligation.
Proper preparation first – cracks repaired, corners and joints reinforced – then the membrane goes on.
We test, hand over the compliance certificate and register your 7-year warranty.
From homes and units to commercial buildings, we cover every part of Thornleigh NSW 2120 and the surrounding upper North Shore and Hornsby area. Call to book a free inspection at a time that suits you.
AB Sydney Waterproofing 24 Copeland St, Liverpool NSW 2170 0449 725 455 avo.bghdoean@gmail.com
Yes. We waterproof family homes on leafy streets to units throughout Thornleigh NSW 2120 and the surrounding upper North Shore and Hornsby area. Call 0449 725 455 to book a free inspection.
Yes. We apply a certified membrane to AS 3740 before tiling and provide a compliance certificate for your records, your builder and any future sale.
Most balcony leaks start at the door sill, the drain or the balustrade fixings, where the membrane has cracked or was never properly detailed. We find the failure point and re-waterproof the balcony properly.
It depends on the size of the area, how much damage the leak has caused and the membrane system needed. Every job starts with a free inspection and a written, itemised quote, so you know the exact price before work begins.
Yes. We work for homeowners, landlords, builders, owner-builders, strata managers and businesses, and supply the certificates and warranties each of them needs.
The most common reasons showers and bathrooms leak, and the early warning signs to look for.
Read MoreWhy balconies fail at the door sill, drain and balustrade, and how the right membrane stops it.
Read MoreThe quiet signs a laundry is leaking, and how to fix it properly.
Read MoreBook a free inspection and written quote from licensed waterproofers.
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