Finding the best waterproofing in Invercargill starts with knowing whether the job is a flat roof, a deck, a basement or a wet area, because each calls for a different membrane system. Waterproofing in Invercargill has to cope with heavy rain, high humidity and groundwater, so the contractors below install torch-on, Butynol, TPO and rubber membranes, tanking systems and deck coatings for homes and commercial buildings. Extreme Roofing’s membrane division and CS Roofing Southland both run from Invercargill, while Christchurch-based Membrane Masters Roofing travels south for flat roof and deck work.
1Extreme Roofing (Extreme Membrane)
Extreme Membrane is the waterproofing division of Extreme Roofing, a Southern roofing group with an Invercargill branch alongside its Cromwell and Dunedin offices. The team installs membrane systems from the ground up, covering below-ground tanking, trafficable deck membranes, wet areas and flat roofs, and also carries out leak detection and crack injection. It suits homeowners, builders and commercial clients who need one contractor for several different waterproofing problems.
Services
- Torch-on and single-ply flat roofing membranes
- Peel-and-stick tanking systems for below-ground walls
- Trafficable membranes for decks and balconies
- Wet area waterproofing
- Leak detection and crack injection
Highlights
- Works with Viking Roofing System, Sealco, Equus, Allco, Ardex, GAF and Sika membranes
- Member of the Roofing Association of New Zealand
- Licensed Building Practitioners
- SiteWise Gold health and safety status
Location & Contact
Name: Extreme Roofing (Extreme Membrane)
Address: Invercargill
Phone: 03 263 4125
Website: extremeroofing.co.nz/membranes
2CS Roofing Southland
CS Roofing Southland is an Invercargill roofing company based on Ettrick Street, and rubber membrane is one of its core service lines alongside metal re-roofs and new build roofs. The team lays waterproof rubber membrane on flat and low-pitched roofs and decking areas for residential and commercial buildings across Invercargill and wider Southland. It is a practical choice for a property owner who wants a membrane roof or deck handled by a local roofer that also looks after spouting and cladding.
Services
- Rubber membrane for flat and low-pitched roofs
- Rubber membrane for decking areas
- Re-roofs, roof repairs and maintenance
- Spouting, downpipes and fascia
Highlights
- Over 40 years of roofing in Invercargill and Southland
- Licensed Building Practitioners and Roofing Association members
- Site Wise Gold and Site Safe members
- Owned by founder Keith Ivey and director Shaun Harris
- Free measure and quote
Location & Contact
Name: CS Roofing Southland
Address: 24 Ettrick Street (Bond Street end), Invercargill
Phone: 03 218 4394
Website: csroofingsouthland.nz
3Membrane Masters Roofing
Membrane Masters Roofing is a membrane roofing specialist with its main office in Christchurch, and it travels to Invercargill, Dunedin and Queenstown for waterproofing work. The team focuses on Butynol and TPO membranes, deck and balcony waterproofing, internal gutters and warm roofs, and uses torch-on applications for tanking and damp proofing on commercial jobs. It suits owners of older Invercargill homes with failing flat roofs or rubber-lined gutters, as well as builders and architects on new projects.
Services
- Butynol and TPO membrane roofing
- Deck and balcony waterproofing
- Internal gutter repairs
- Warm roof installation
- Torch-on tanking and damp proofing
Highlights
- Authorised applicator for Bituflame, Viking, Sealco, Nuralite and Ardex
- 14 years of professional roofing experience
- Also handles asbestos roof removal and emergency roof repairs
Location & Contact
Name: Membrane Masters Roofing
Address: Christchurch (services Invercargill)
Phone: 021 022 09522
Website: membranemasters.co.nz/Roofing-Invercargill
Waterproofing in Invercargill at a Glance
| Business | Highlight |
|---|---|
| Extreme Roofing (Extreme Membrane) | Works with Viking Roofing System, Sealco, Equus, Allco, Ardex |
| CS Roofing Southland | Over 40 years of roofing in Invercargill and Southland |
| Membrane Masters Roofing | Authorised applicator for Bituflame, Viking, Sealco, Nuralite and Ardex |
How to Choose the Right Waterproofing in Invercargill
- Match the system to the job: a flat roof, a trafficable deck, a basement wall and a shower each need a different membrane, so ask which system the contractor recommends and why.
- Check applicator approval: membrane warranties usually depend on installation by an applicator approved by the manufacturer, such as Ardex, Viking or Sealco.
- Ask about producer statements: consented work normally needs a PS3 from the installer, so confirm one will be supplied before work starts.
- Look for Licensed Building Practitioners: restricted building work on roofs and decks must be carried out or supervised by an LBP.
- Consider the climate: Southland’s rain and humidity punish poor detailing, so ask how outlets, upstands and internal gutters will be handled.
Frequently Asked Questions About Invercargill Waterproofing
What types of waterproofing membrane are used on Invercargill roofs and decks?
The most common systems are torch-on bitumen membranes, synthetic rubber membranes such as Butynol, and single-ply membranes such as TPO. Decks that people walk on need a trafficable membrane or a membrane protected by tiles or timber, while basement walls use tanking systems applied below ground.
Do I need a building consent for waterproofing work?
Replacing a membrane roof or waterproofing a deck is often building work that needs consent, particularly where the deck is a roof over a living space. Check with Invercargill City Council before work starts, and ask your contractor what documentation they will provide.
How do I check a waterproofing contractor is a Licensed Building Practitioner?
Search the public Licensed Building Practitioners register by name. It shows each practitioner’s licence class, such as roofing or external plastering, and whether the licence is current.
What is a PS3 and why does it matter?
A PS3 is a producer statement in which the installer confirms the work was done to the manufacturer’s specification and the Building Code. Councils usually ask for one before issuing a code compliance certificate for consented membrane or wet area work, and buyers and insurers often ask for it later.
How long does a membrane roof or deck last?
A correctly installed and maintained membrane can last for decades, but lifespan depends on the system, exposure and how well drainage outlets are kept clear. The Building Performance site sets out the Building Code durability requirements that membranes are expected to meet.
Can a leaking membrane be repaired rather than replaced?
Many leaks come from a failed joint, outlet or upstand rather than the whole sheet, so a contractor can often locate and repair the fault. If the membrane has aged and is cracking across large areas, replacement is usually the better long-term option.
Where can I find waterproofing in Invercargill near me?
Invercargill has membrane contractors based in the city, and specialists from elsewhere in the South Island also travel south for flat roof and deck jobs. Most will visit a site anywhere in Invercargill and across wider Southland to measure and quote.
Is basement waterproofing different from deck waterproofing?
Yes. Below-ground tanking has to resist water pressure from the soil side, so it uses different membranes and detailing from an exposed deck or roof. Ask a contractor whether they install tanking systems specifically before booking basement work.
How We Chose the Best Waterproofing in Invercargill
Every business in this guide was found by searching for waterproofing in Invercargill, then checked against what the business publishes itself: its own website, or where it has none, its official social or booking page. Names, addresses and phone numbers come from those pages rather than a directory feed, so what you see here is what the business says about itself. We also check that each one is still trading and is actually based in or genuinely serving Invercargill, rather than a national operator running a local landing page. A business we can’t confirm from its own pages is not listed.