Can Strataflex be used outdoors?

Yes, Strataflex is suitable for both interior and exterior applications, including balconies, patios, and other wet areas exposed to the elements.

What surfaces can it be applied to?

It bonds to concrete, wood, stone, existing tiles, metal, and more. Always check that the surface is stable, clean, and properly primed before installation.

Is Strataflex suitable for high-movement areas?

Yes, Strataflex has excellent elongation and crack-bridging properties, making it ideal for areas with structural movement or temperature variation.

STRATAFLEX Waterproofing membrane

$40.70 - $40.70

$40.70 incl. GST

$40.70 - $40.70

$40.70 incl. GST

Overview

STRATAFLEX is a self-adhering waterproof sheet membrane designed for use under tiles in both internal and external areas. It’s a 1.0 mm thick elastomeric sheet that installs quickly over primed substrates, no curing time, no mess. 1 Roll is 13.5 SQM.

Quantity

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Features

Creates a watertight seal with integrated lap joints—no extra tapes or liquid layers required
1.0 mm thick, tear-resistant sheet handles structural movement and surface variation
Self-adhering installation with NAC TAC Primer—no additional adhesives needed
Ideal for high-use spaces like bathrooms, balconies, kitchens, and commercial flooring
Works over damaged, uneven, or previously tiled surfaces
Sheet format allows fast, consistent installation across large areas

Where to use it

Use it when you're working with:

Internal wet areas (bathrooms, laundries, kitchens)
External tiled areas (balconies, decks, terraces)
Commercial sites (restaurants, malls, office buildings)
Multi-residential housing or apartment projects
Renovations where substrates may be damaged or variable

How to use

Sheet Installation

Primer Required: NAC TAC Primer (must be fully dry to tack before application)
Installation:

Roll out STRATAFLEX over the primed surface
Remove the release liner and press firmly into place
Overlap each sheet by 50 mm using the built-in double-stick edge
Use a hand roller over seams for best results

Compatible Surface

Poured or precast concrete
Concrete backer board and lightweight screeds
Gypsum and patching compounds
Plywood, tongue & groove, and OSB (with correct gapping)
Existing tile, terrazzo, and VCT/VAT
Painted, sealed, or cracked substrates
Suitable metal surfaces

Appearance

Black flexible sheet with self-adhesive backing

Pro Tip

Use STRATAFLEX when both waterproofing and crack isolation are required—especially in areas with movement or irregular substrates. It speeds up installation while reducing the risk of future failures.

Downloads

Data Sheet Information Sheet Safety Sheet

Creates a watertight seal with integrated lap joints—no extra tapes or liquid layers required
1.0 mm thick, tear-resistant sheet handles structural movement and surface variation
Self-adhering installation with NAC TAC Primer—no additional adhesives needed
Ideal for high-use spaces like bathrooms, balconies, kitchens, and commercial flooring
Works over damaged, uneven, or previously tiled surfaces
Sheet format allows fast, consistent installation across large areas

Use it when you're working with:

Internal wet areas (bathrooms, laundries, kitchens)
External tiled areas (balconies, decks, terraces)
Commercial sites (restaurants, malls, office buildings)
Multi-residential housing or apartment projects
Renovations where substrates may be damaged or variable

Sheet Installation

Primer Required: NAC TAC Primer (must be fully dry to tack before application)
Installation:

Roll out STRATAFLEX over the primed surface
Remove the release liner and press firmly into place
Overlap each sheet by 50 mm using the built-in double-stick edge
Use a hand roller over seams for best results

Poured or precast concrete
Concrete backer board and lightweight screeds
Gypsum and patching compounds
Plywood, tongue & groove, and OSB (with correct gapping)
Existing tile, terrazzo, and VCT/VAT
Painted, sealed, or cracked substrates
Suitable metal surfaces

Black flexible sheet with self-adhesive backing

Pro Tip

Downloads

Data Sheet Information Sheet Safety Sheet

How to use guide or featured videos

Frequently Asked Questions

1. What is STRATAFLEX used for?
STRATAFLEX is a sheet-applied waterproofing membrane designed for use under tile in wet areas like bathrooms, balconies, kitchens, and commercial floors.

2. Does STRATAFLEX need a primer?
Yes, it must be installed over NAC TAC Primer. The primer ensures full adhesion and long-term performance, especially on porous or variable substrates.

3. Can I use STRATAFLEX over cracked or uneven floors?
Yes. STRATAFLEX can be installed over damaged or irregular surfaces, including cracked concrete and existing tiles. It also provides crack isolation.

4. Is STRATAFLEX suitable for exterior use?
Absolutely. It’s designed for both internal and external use—making it ideal for balconies, terraces, and other exposed tiled areas.

5. How are seams joined between sheets?
Each sheet has a 50 mm double-stick lap joint. Overlap the sheets and press them firmly to create a continuous, watertight seal. Use a roller for best results.

Shipping and Return Policy

At Surtec, we aim to make your experience as seamless as possible. Orders are processed efficiently through our Auckland branches and distributed nationwide via our growing logistics network. For any queries about delivery times, product availability, or returning an item, feel free to get in touch with our team. We're here to help you keep your projects moving.