Butynol is one of New Zealand's most widely used waterproofing membrane systems. Developed specifically for NZ conditions, it has been protecting homes and buildings across the country for decades.

Whether you are maintaining an existing Butynol roof or considering it for a new project, this guide covers everything you need to know about Butynol roofing systems.

What Is Butynol Roofing

Butynol is a synthetic rubber membrane made from butyl rubber. It is manufactured in New Zealand and is BRANZ appraised, making it one of the most trusted waterproofing products in the country.

The membrane is supplied in rolls and is installed by bonding it to a prepared substrate using a solvent-based adhesive. Seams and joints are overlapped and sealed using the same adhesive system, creating a continuous waterproof layer across the roof surface.

Butynol is available in several colours and thicknesses to suit different applications. It remains flexible across a wide temperature range, which makes it well-suited to New Zealand's variable climate.

Benefits of Butynol Membranes

BRANZ Appraised

Butynol is independently tested and appraised by BRANZ, New Zealand's leading building research association. This gives homeowners confidence in the product's performance and durability.

Proven Track Record

Butynol has been used across New Zealand for over 40 years. Its long history provides real-world evidence of its reliability in NZ conditions.

Easy to Repair

Butynol repairs are straightforward — patches can be bonded directly to the existing membrane using the same adhesive system. This makes maintenance and spot repairs cost-effective.

Flexible in All Temperatures

Butynol remains flexible even in cold conditions, which prevents cracking and splitting. This is important for properties exposed to frost and significant temperature swings.

Cost-Effective

For residential projects, Butynol is often the most cost-effective membrane option. It provides reliable waterproofing at a competitive price point.

Made in New Zealand

Butynol is manufactured locally and designed specifically for New Zealand conditions, including UV exposure, rainfall patterns and building code requirements.

Common Butynol Roof Repairs

Like all waterproofing systems, Butynol roofs can develop issues over time. The most common repairs we carry out include:

Seam Failure

The adhesive bond between overlapping sheets can deteriorate over time, allowing water to enter beneath the membrane. Seam repairs involve re-bonding or patching the affected area.

Blistering and Bubbling

Trapped moisture or adhesive failure can cause blisters in the membrane surface. Small blisters can be patched, while widespread blistering may indicate a larger issue.

Puncture Damage

Physical damage from foot traffic, fallen branches or maintenance work can puncture the membrane. These are typically repaired with bonded patches.

Flashing and Upstand Failure

The membrane around penetrations, walls and parapets is particularly vulnerable. Failed flashings are a common source of leaks in Butynol roofs.

Shrinkage and Pulling

Over time, the membrane can shrink slightly, pulling away from edges and flashings. This creates gaps that allow water ingress.

If your Butynol roof is leaking, our team can diagnose the issue and carry out professional repairs. Contact us for leaking roof repairs in Auckland.

When Butynol Roof Replacement Is Needed

While Butynol roofs can last 15–20+ years with proper maintenance, there comes a point where replacement is more cost-effective than ongoing repairs. Signs that your Butynol roof may need replacement include:

Multiple active leaks across different areas of the roof
Widespread seam failure or delamination
Significant shrinkage causing the membrane to pull away from edges
Extensive blistering or bubbling across the surface
The membrane has become hard, brittle or cracked
Previous patch repairs are no longer holding
The roof is over 20 years old and showing signs of general deterioration

When replacement is needed, we can install a new Butynol membrane or recommend an alternative system like TPO depending on your property and budget.

Butynol Roofing Systems Explained