Sealco Polyurethane - Starflex Mono

Starflex Mono is a single-component, elastic polyurethane liquid membrane for the seamless re-roofing, waterproofing of roofs, terraces, and balconies. Manufactured in Italy, it is moisture-curing, cold-applied, and flame-free — making it a safe and straightforward replacement for torch-on and heat-applied systems.

Starflex Mono is an iconic product in the seamless waterproofing sector, synonymous with quality and reliability. Its advanced formulation and long track record in the market make it a proven choice for protecting structures against water ingress and atmospheric attack — on new roofs and in remedial re-coating applications alike. Sealco currently stocks Starflex Mono membrane and Starflex primer.

Properties:

Single-component — no mixing required
Moisture curing — cold applied, no flame or heat
High elasticity and crack-bridging capability
Seamless, continuous waterproofing membrane
Excellent adhesion to concrete, bituminous sheath, PVC, tiles, and metal
Permeable to water vapour
Resistant to water stagnation and UV rays
Low VOC — reduced environmental impact
Apply by brush, roller, or airless spray
Application temperature: +5°C to +35°C (RH < 85%)
Operating temperature range: -40°C to +80°C

Uses

Flat and low-pitch roof waterproofing
Terraces and balconies
Re-coating and restoration of existing membrane roofs
Waterproofing under tiles
Roof gardens
Wet areas
Asbestos encapsulation
Concrete, bituminous sheath, PVC, tile, and metal substrates

Certifications

CE1504
UNI14891
ETAG005
BroofT4
Cam Compliant
LEED credits
Asbestos encapsulation
Under-tile certified

Features and advantages

Cost-effective re-roofing

Starflex Mono can be applied directly over existing membranes — bituminous, PVC, TPO, and others — without removal. Clean, prime if required, and apply. No need to open up the roof or disturb the existing structure.

Single-component — no mixing

Ready to use straight from the pail. Moisture curing means no catalyst, no mixing ratio errors, and no wasted product. Simplifies preparation and reduces the risk of application failures on site.

Excellent adhesion to most substrates

Bonds directly to concrete, bituminous membranes, PVC, metal, and tiles — in many cases without a primer. Where a primer is recommended, PRIMER 0130 R is available from Sealco.

Cold applied — no flame, no heat

Unlike torch-on membranes, Starflex Mono is cold applied and flame-free. This makes it safer on occupied buildings, over insulation layers, and in confined or sensitive environments where open flame is a risk.

High elasticity and crack bridging

The elastic polyurethane formulation accommodates structural movement and bridges cracks in the substrate. Maintains flexibility at low temperatures, making it suitable for New Zealand's varied climate conditions.

Certified up to 25-year durability

CE certified to EN 1504 and ETAG 005. Holds UNI 14891 approval and BroofT4 fire rating on cement substrates. System durability certified up to 25 years. The Italian manufacturer has been manufacturing waterproofing membranes in Italy since 1955.

Coating quantity calculator

Enter your roof area and select your desired warranty period to estimate how much Enduris 3500 you will need.

https://www.sealco.co.nz/ge-enduris

Starflex — Coating Calculator

Estimate how much Starflex you need. Metric (kg).

Roof area (m²)

Total area of the roof surface to be coated.

Metal roof?

Yes

Select Yes for corrugated or profiled metal — adds 15% for surface profile.

Warranty period

15-year warranty

Starflex is specified at 16 m² per 24.5 kg pail coverage rate.

Theoretical

kg needed —

24.5 kg pails —

kg per m² —

Practical

kg needed —

24.5 kg pails —

kg per m² —

Theoretical= minimum kg based on a coverage rate of 16 m² per 24.5 kg pail (1.53 kg/m²). Practical adds a 20% allowance for surface texture, wind loss, and coating remaining in equipment. Metal roof adds 15% for profiled surface area. Results are estimates only — always confirm quantities with your supplier before ordering and follow local building code requirements.

Installation Steps

The standard reinforced system for roofs and terraces. Always use Startex reinforcement fabric for full waterproofing performance. For detailed method statements refer to the brochure.

1

Substrate preparation

2

Primer application

Apply PRIMER 0130 R (universal single-component rapid primer) to the existing substrate. Coverage approximately 100–200 g/m² depending on porosity. Wait for overcoating time (minimum 60 minutes).

3

First coat of Starflex Mono

Apply first coat of Starflex Mono liquid membrane at a minimum of 0.7 kg/m². Lay STARTEX NW non-woven fabric onto the wet coat and press with an unloaded roller to embed fully.

4

Second coat

Apply second coat of Starflex Mono liquid membrane at a minimum of 0.7 kg/m². Allow to cure.

5

Final coat

Apply a final coat of Starflex Mono at a minimum of 0.6 kg/m². Minimum total membrane consumption: 2.0 kg/m² (without finish coat).

6

Protective finish (recommended)

Apply an aliphatic polyurethane UV-protective finish coat (STARFLEX MONO TOP or POLISTAR line) at 150–400 g/m² for UV protection and colour. Contact Sealco to discuss finish options.