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Flash Harry Thermoflex 4mm Torch-On Waterproofing Membrane (1m x 10m)
Original price was: R1 649,00.R1 200,00Current price is: R1 200,00.
The Flash Harry Thermoflex 4mm Waterproofing Membrane (1m x 10m) is a preformed, APP-modified bitumen membrane designed for professional torch-on waterproofing systems. It creates a strong, impermeable barrier that protects buildings and concrete structures against water penetration and long-term moisture damage.
Thermoflex is suitable for concrete roof decks, balconies beneath screeds or tiles, retaining walls, basements, water-retaining structures, planters and flower boxes. Its reinforced construction provides good dimensional stability, strength and resistance to normal movement within properly prepared substrates.
The 4mm membrane is supplied in rolls measuring 1 metre wide by 10 metres long. The manufacturer’s technical information describes the 4mm grade as weighing approximately 4.8kg per square metre, which gives an estimated membrane weight of about 48kg before packaging. Retail listings may show a packaged weight of approximately 52kg.
For the best installation, Thermoflex should be applied over the manufacturer’s compatible solvent-based primer. Flash Harry states that the primer should be allowed approximately three hours to dry before the membrane is installed. Where the membrane remains exposed to sunlight, the manufacturer recommends protecting it with a suitable bituminous aluminium coating rather than an ordinary acrylic roof paint.
Key Features
- 4mm APP-modified bitumen membrane
- Professional torch-on application
- 1m x 10m roll size
- Impermeable to water vapour
- Strong reinforced construction
- Good dimensional stability
- Excellent joint and overlap adhesion
- Resistant to mild acids and alkali solutions
- Suitable for horizontal and vertical waterproofing
- Designed for demanding structural applications
- Suitable for residential, commercial and industrial projects
The technical data reports tensile strength above 900 N/5cm, tear resistance above 300 N and elongation above 25% at 25°C.
Benefits
- Creates a durable waterproof barrier
- Helps prevent roof leaks and moisture penetration
- Protects concrete and below-ground structures
- Offers strong resistance to tearing and movement
- Provides reliable adhesion at joints and overlaps
- Suitable for new waterproofing and refurbishment work
- Helps extend the usable life of roof decks and structures
- Can be used as part of a professional multi-layer waterproofing system
Suitable Applications
- Flat concrete roofs
- Concrete roof decks
- Balconies beneath tiles or screeds
- Roof terraces
- Basements
- Retaining walls
- Water-retaining structures
- Planters and flower boxes
- Foundations
- Concrete slabs
- Podiums
- Box gutters
- Commercial and industrial roofing projects
These uses are consistent with the manufacturer’s listed applications for Thermoflex torch-on systems.
Technical Specifications
| Brand | Flash Harry |
|---|---|
| Product Range | Thermoflex |
| Product Type | APP-Modified Torch-On Waterproofing Membrane |
| Thickness | 4mm |
| Roll Size | 1m × 10m |
| Nominal Coverage | Approximately 10m² before overlaps, cutting and wastage |
| Colour | Black |
| Membrane Composition | APP-modified bitumen with reinforced composite carrier |
| Application Method | Professional gas torch application |
| Compatible Primer | Flash Harry Thermoflex solvent-based primer |
| Suitable Substrates | Properly prepared concrete, cementitious surfaces and approved timber substrates |
| Suitable Applications | Concrete roof decks, balconies, basements, retaining walls, planters, water-retaining structures and roof refurbishment projects |
| Water Vapour Permeability | Impermeable |
| Total Solids | 100% |
| Specific Gravity | Approximately 1.3–1.4 |
| Elongation | Greater than 25% at 25°C |
| Tensile Strength | Greater than 900 N/5cm |
| Tear Resistance | Greater than 300 N |
| Chemical Resistance | Resistant to mild acids and alkali solutions; not resistant to hydrocarbon solvents or diesel |
| Product Weight | Approximately 52kg packaged |
| Packaged Dimensions | Approximately 230mm × 280mm × 1000mm |
| Supplier Product Code | 9411101011 |
| Retail Product Code | 1078122 |
| UV Protection | Protect exposed membrane with a manufacturer-approved bituminous aluminium coating |
| Professional Installation | Required due to open-flame torch application |
Why Choose This Product?
Flash Harry Thermoflex is a well-established torch-on waterproofing membrane designed for applications where ordinary surface coatings may not offer enough protection. Its 4mm reinforced construction, impermeability and resistance to normal structural stresses make it suitable for demanding waterproofing environments.
The product is especially useful where customers need a professional membrane system for concrete roofs, balconies, basements, retaining walls or water-retaining structures. Correct surface preparation, compatible primer and experienced torch-on installation remain essential to the final performance of the system.
Looking for the right membrane for your project?
Compare the Flash Harry Thermoflex 4mm Waterproofing Membrane with the Axton Torch-On Waterproofing Membrane 4mm and the a.b.e Torch-On Waterproofing Membrane Black 4mm.
You can also browse the complete Torch-On Waterproofing Membranes category or learn more about RAB Group’s professional Torch-On Waterproofing Services for residential, commercial and industrial properties.
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We combine 18 years of waterproofing expertise, reliable workmanship, and professional service to deliver long-lasting roofing and protective coating solutions across South Africa.
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South Africa, 2040
South Africa, 2040
