A leaking flat or low-slope roof rarely fixes itself — it tracks along the deck and shows up far from the source. Goliath Coatings provides expert roof leak repair and membrane roofing across Auckland, finding the real cause and resealing the roof with a watertight TPO, EPDM or torch-on system built to last.
Roof leak repair that finds the actual cause
Effective roof leak repair starts with diagnosis, not guesswork. We inspect the membrane, flashings, upstands, penetrations and drainage to find where water is actually getting in — often a failed lap, a cracked upstand or a blocked outlet rather than the obvious wet patch inside. Then we use a repair or recover that fixes the cause, so the leak does not simply return after the next downpour.
The membrane systems we install
We work across the main flat-roof technologies and match the system to the roof: TPO and PVC single-ply for durable, heat-welded seams; EPDM rubber for long-life flexibility; and torch-on bitumen membranes for robust, multi-layer waterproofing. Each is fully bonded or mechanically fixed, with detailed flashings at every penetration and upstand — the details are where most roofs fail, so that is where we focus.
Repair, recover or replace
Not every leaking roof needs replacing. Where the membrane has life left we repair and reseal; where it is widely failed we recover over the top or strip and replace. We give you the honest call and a clear scope, so you spend on what the roof actually needs rather than a blanket re-roof.
The products and systems we use
We waterproof commercial flat and low-slope roofs with the membrane the building calls for. For single-ply we install Viking Enviroclad TPO, NZ’s most-installed TPO with heat-welded seams, and Viking Epiclad EPDM rubber for large roofs with decades of NZ track record. Where a torch-on system is specified we use Nuralite Nuraply 3PM, NZ’s most-specified double-layer bitumen membrane, and we also install weldable PVC such as Sika Sarnafil and Ardex WPM 715.
Why choose Goliath Coatings
Flat-roof waterproofing and leak repair are a core specialty. We waterproof commercial flat and low-slope roofs with the membrane the building actually calls for, and trace existing leaks back to the real source instead of just patching the symptom. Free on-site assessment, one-business-day response, and 5-star Auckland reviews.
Roof leak repair FAQs
Q: How do you find where a roof is leaking?
A: We trace it back from the inside and inspect the membrane, flashings, penetrations and drainage on the roof — the entry point is usually well away from where the water shows up.
Q: Can you repair my roof or does it need replacing?
A: Often a targeted repair or recover is enough. We assess the membrane honestly and only recommend full replacement when the roof is widely failed.
Q: Which membrane is best for a flat roof?
A: It depends on the roof — TPO, EPDM and torch-on each have strengths. We match the system to your roof, budget and access.
Q: Which is better — TPO, EPDM or torch-on?
A: It depends on the roof. TPO (Viking Enviroclad) suits most commercial roofs, EPDM (Epiclad) suits large simple roofs, and torch-on (Nuraply 3PM) suits complex detailing — we use to the roof, not a one-size answer.
Q: What determines the cost?
A: Roof size, access, and the condition of the existing membrane or coating. That is exactly why the assessment is free — we find the real cause first, then give you a firm, itemised quote before any work starts.
Q: Is the work guaranteed?
A: Yes — our workmanship is guaranteed and we install proven systems from leading suppliers. Goliath Coatings is fully insured, Tōtika accredited and Site Safe certified.