Leaking roof? We'll fix it properly and warrant it for years.
RTT Sealant is a licensed waterproofing contractor. We seal commercial and large roofs with a cold-applied liquid rubber membrane that holds for years and costs a fraction of what re-roofing would.
Free, no-obligation quote
Tell us about the roof and we'll give you a fixed price — usually within one business day.
- Free on-site assessment
- Fixed, transparent pricing
- Response within 1 business day
No obligation. Your details stay private.
Which best describes you?
RTT does the work for you. Tell us which one you are and we'll point you the right way.
Property owner / manager
You've got a leaking or ageing commercial roof and need it fixed once, properly, with a warranty.
Get a free site assessment →Trade / referral partner
Plumber, roofer or builder with a client whose roof leaks? Refer it to us. We do the work, you look good.
Make a referral →Solar PPA installer
Every panel fixing is a penetration. We seal them all before install, then maintain them for 20 years.
Talk PPA waterproofing →Just want to DIY it yourself?
Smaller job and happy to apply it? Shop the same Australian-made product, delivered to your door.
A leaking commercial roof only gets more expensive
Left untreated, a failing membrane quietly drains money and creates liability. The longer it runs, the more it costs to fix.
Damage compounds silently
Structural water ingress, soaked insulation, and ruined fitout accumulate long before the ceiling stain shows.
OH&S & tenant disruption
Internal slip hazards, damaged stock, and disrupted tenants turn a roof problem into a business problem.
Reactive repairs never end
Patch-and-pray callbacks keep recurring, and every emergency call-out costs more than a planned fix would.
A proven 4-stage system
Cold-applied. No open flame. Minimal disruption to tenants and operations.
Surface preparation
High-pressure water blast strips rust scale, contaminants and loose material for a clean substrate.
Liquid rubber membrane
Seamless cold-applied elastomeric layer over seams, penetrations, box gutters and detail areas.
Geo textile detailing
Reinforcement embedded at screws, joints and penetrations, which are the weak points where leaks start.
NetZero reflective topcoat
UV protection and heat reflection that weatherproofs the roof and cuts internal energy costs.
The safe choice for a job that can't fail
Years experience
On major Australian commercial roofs since 2008.
Public liability
Full cover on every job, every site.
Licensed #1242527
Class: Waterproofing. Fully accountable.
Warranty
Documented, with scheduled inspections.
25,000+ m² delivered on major Australian roofs
Shopping centres, airports, government facilities and telco infrastructure.
Optus Rosebery
5,000 m²AMPOL Refinery, Brisbane
1,000 m²Brisbane Airport — Box Gutters
200 lin. mDraculas
1,000 m²Dreamworld
2,000 m²Mooloolaba (Coles)
5,500 m²Reference contacts available on request, subject to client confidentiality agreements.
Trusted by the people who own the roofs
Facility managers, retail groups and government, in their own words.
"RTT Sealant completed major roof waterproofing and restoration projects at our facilities in Brisbane and Townsville. The projects were a complete success — not only does the roof look brand new with its bright white solar reflective finish, there are no more leaks into the buildings. Given the size and difficulty of the applications, the hard-working RTT Sealant team was up to the task. We look forward to working with them on future projects."
"RTT Sealant has completed numerous waterproofing projects for Australia Fair Shopping Centre in Southport, including sealing concrete cracks and expansion joints in the car parks as well as box gutters and ridge capping on the roof. I found the application team to be very accommodating and professional, and their products have proved to be very effective and reliable."
"The roof at Coorparoo Education Precinct was in need of replacement, but due to the cost of removing the roof-mounted air-conditioning units it wasn't possible within budget. Your roof coating solution eliminated the need for removal, and all roof leaks were fixed after the product was installed. The team was a pleasure to deal with — always professional and safe. We are very pleased."
From rusted & leaking to sealed & reflective
Drag the slider to compare a roof before and after the RTT Sealant system.
After
BeforeRecent commercial roof projects
Waterproofed and thermally coated with the RTT Sealant system across major Australian sites.
Three simple steps to a roof that lasts
No paperwork to start. Just a conversation, and we take it from there.
Request a quote
Send us a few details by form or phone. Takes under a minute.
Free site assessment
We inspect the roof, scope the work, and give you a clear no-obligation quote.
We deliver the job
From surface prep through to warranty, you deal with one team that owns the whole job.
Get your free, no-obligation quote
Tell us about the roof. We'll arrange an assessment and give you a fixed price, usually within a few days.
Before you ask
Will a coating really last, or do I need to re-roof?
Our cold-applied liquid rubber is a permanent membrane, not a patch. On a sound structural roof it restores full waterproofing for a fraction of what re-roofing costs, and we back it with a 10-year warranty (up to 20 years on PPA projects).
Are you licensed and insured for a job this size?
Yes. QBCC Licensed #1242527 (Class: Waterproofing) with $20M public liability cover on every site. Certificates are available on request.
Will it disrupt our tenants or trading hours?
The system is cold-applied with no open flame, so disruption is minimal. We coordinate around your operations and can stage works to keep the site running.
Do you only work on the Gold Coast?
We're Gold Coast based and have delivered projects across QLD, NSW, VIC and WA, including Optus Rosebery and Brisbane Airport. Tell us your location and we'll confirm scheduling.
How much does it cost?
Every roof is different, so we quote after a free site assessment. Pricing is transparent and line-itemed, and almost always well below the cost of re-roofing or repeated reactive repairs.