Liquid Membrane™️ Waterproofing Western Australia
Your Trusted Waterproofing Experts
At SEMCO Works, we harness advanced liquid waterproofing technology to provide easy solutions for home owners and surfacing professionals that meet Australian standards. Developed over three decades ago by expert engineers, Liquid Membrane is designed to be the only formula you need for all your waterproofing and anti-fracture needs.
Why Choose SEMCO Works?
30 Years of Experience
SEMCO technicians have been perfecting the Liquid Membrane™️ formula over three decades in the surfacing industry. It’s been tried and tested in the field, now supplied in 10 countries around the world.
Versatile Applications
Apply it over 15+ substrates — including tiles, concrete, plaster, and wood — for all types of waterproofing challenges. Fix leaking balconies, waterproof your garage, protect your roof from heavy rains and more.
User Friendly
Apply in just one day with 2-3 coats and a drying time under 45 minutes for each. Just use a roller or brush, and extra fabric reinforcement if needed. We have detailed installation guides with easy instructions for each substrate on our product page.
Multipurpose Solution
Achieve all your waterproofing needs and long-term anti-fracture protection in one product, designed to extend the lifespan of your surfaces both old and new.
Cost-Efficient
Get advanced performance at prices that fit your budget. Compared to other membranes on the market, Liquid Membrane™️ is cheaper per square metre and has the most efficient coverage.
Satisfaction Guaranteed
Our job isn’t done until you’re completely satisfied. We stand by our work and offer warranties to give you peace of mind.
EASY DIY APPLICATIONS
Seal any leaks and cracks with a seamless and durable watertight barrier, including direct application to tiles, wood, concrete, and more. A cost-effective solution for fixing water damage to timber decks, outdoor tiles, villaboard and more.
Waterproof Bathrooms & Showers
An affordable way to waterproof wet rooms, showers, or the entire bathroom in your next construction project. An average bathroom is 15m2, which would require one 4L bucket at only $195. Whether you’re preparing for bathroom resurfacing or just fixing a leak, apply straight over tiles, cement board, and more
Fiberglass & Concrete Pool Waterproofing
The most trusted waterproofing product for pool installations by surfacing professionals, from small plunge pools to olympic-sized swimming pools. Liquid waterproofing ensures full coverage in hard-to-reach areas like corners and edges. Can withstand pool chemicals, temperature fluctuations, and water pressure for a long-lasting, low-maintenance way to preserve your investment.
Rooftops & Gutters
If you have leaking rooftops or gutter damage, Liquid Membrane™️ provides long-lasting protection to avoid the costs of replacement. Safeguard your property from water damage with suitability for a wide range of rooftop materials, including metal and concrete.
Basements & Garages
Ideal for both preventative measures and repairing existing issues in basements and garages, including flood prevention for underground levels. Heavy duty and rated for load-bearing, Liquid Membrane™️ can withstand vehicle pressure for durable garage floor waterproofing.
WATERPROOFING FAQ
Liquid Membrane™️ Product Information
Where can I install SEMCO Liquid Membrane™️?
SEMCO Liquid Membrane can be installed directly over a wide range of existing surface materials, across both internal and external areas. The most common applications are leaky balconies, waterproofing pools, showers, rooftops, basements and garages.
The substrates you can apply it over include:
- Concrete
- Wood
- Fiberglass Pools & Concrete Pools
- Stone
- Tiles
- Render / Interior & Exterior Cladding
- Metal & Aluminum
- Plaster, Villaboard & Cement Sheeting
- MDF
- Bricks
- Asphalt
Does SEMCO Liquid Membrane™️ meet Australian Standards?
Yes, our SEMCO Liquid Membrane has been tested according to Australian standards and is certified for Internal (AS4858) and External (AS4654.1-2012) applications.
How does the SEMCO Liquid Membrane™️ differ from other waterproofing membranes?
Compared to rubber and silicone-based membranes, SEMCO Liquid Membrane has much better adhesion and resistance strength, faster drying times, and can be applied to almost all hard surfaces internally and externally (including UV exposure). In comparison to similar waterbased formulas on the market, it has an elongation up to 1300% before break — while others only have 800%.
What is the coverage of SEMCO Liquid Membrane™️?
A little goes a long way with SEMCO Liquid Membrane™️. Each litre provides 2-3m2 of coverage at 2 coats (with a depth of 0.75mm each coat). Coverage may vary depending on porosity of the substrate.
Is SEMCO Liquid Membrane waterproofing expensive?
Liquid Membrane is professional-grade waterproofing made affordable for everyone, at only $13.50 per m2 based on 10L bucket. For reference, if an average bathroom is 15m2, this would require just one 4L bucket at only $195. For larger areas, 18.9L of SEMCO Liquid Membrane™️ costs $601 and has a coverage of 50-60m2 for two coats — working out at only $12 per square meter.
Can new surfaces such as tiles be applied on top of Liquid Membrane waterproofing?
Definitely! You can apply the SEMCO Liquid Membrane™️ directly on your existing substrate as a primary waterproofing layer before applying the new surface. For tiles, you can apply your mortar/thin-set directly on top of the dry Liquid Membrane.
Can I paint over SEMCO Liquid Membrane™️?
Yes, absolutely! We recommend a urethane based or water based acrylic paint if you wish to paint over the SEMCO Liquid Membrane™️
Where can I buy Liquid membrane?
Our SEMCO Liquid Membrane is only sold online via this website, with delivery Australia-wide.
What does SEMCO Liquid Membrane™️ look and feel like when dry?
This product dries hard with a semi-gloss finish. You can choose from a wide range of colours, including a semi-clear finish.
Can I use SEMCO Liquid Membrane™️ for my driveway?
Yes, you can apply Liquid membrane as a waterproofing application and then apply 3 coats of SEMCO Titan Shield over for trafficable durability.
Can SEMCO Liquid Membrane™️ be installed inside a pool?
Yes, you can apply our Liquid Membrane to concrete and fiberglass pools following our pool installation method. For fiberglass pools we recommend sanding it with 60 grit sand paper and using Prep B.
Liquid Membrane™️ Waterproofing
Installation Tips
How do I ensure the Liquid Membrane™️ has bonded to the surface I apply it to?
To ensure that the SEMCO Liquid Membrane has bonded to the substrate, we recommend doing a pull test. This is where you place a piece of tape anywhere on the membrane and pull it off. If the membrane does not come off, then that signifies that it has fully bonded.
Can the SEMCO Liquid Membrane™️ be used as a finished surface that I can walk on?
If you're installing our Liquid Membrane as a finish coat, the membrane needs to be sealed using our SEMCO Titan Shield Gloss.
Before installing SEMCO Liquid Membrane™️, what surface preparation needs to take place?
Before installing, make sure you follow the installation procedures based on the surface you're applying our Liquid Membrane onto. You can find our surface preparation matrix by clicking here.
Why does my SEMCO Liquid Membrane™️ discolour when getting in contact with water?
Product discoloration is a clear sign that the SEMCO Liquid Membrane™️ has not fully cured, yet however it will not affect its waterproofing capabilities. It is important to stick within the recommended preparation, re-coating times and thickness per coat. Any deviation may cause an exponentially prolonged drying and curing times. If you have already filled up the pool/fountain with water, drain it and allow curing to happen. If in doubt reach out to customer service via call, email or live chat.