isoweld®
Precision Induction Welding
The isoweld® fastening system uses induction welding to secure single ply membranes to dedicated stress plates, delivering a non-penetrating fastening solution. The innovative system increases installation efficiency, ensures security, and reduces overall project costs.
50%
Potential fewer fasteners
Cost savings advantage
3s
Welding time
Fast welding, speedy installation
20%
Potential savings
On the total install cost
40m+
Square meters
Successfully installed worldwide
The benefits of isoweld®
The Isoweld induction welding machine provides multiple benefits for efficient and high-quality welding.
Efficiency
- Induction welding achieves secure welds in as little as 3 seconds, significantly speeding up installation
- Membrane-compatible wheels improve roof manoeuvrability and productivity
Security & Reliability
- Search and Find functionality keeps the tool aligned on the plate and prevents welding if misaligned to avoid incorrect or partial welds
- Mechanical fixing supports pull-out testing and wind-load calculations
Ergonomics
- Height-adjustable handles support an ergonomic working position and reduce the need to bend down
- Improved installer comfort helps to reduce strain and supports productivity
Cost Efficiency
- Field-fixed positioning enables even fastener spacing without membrane penetration and may require up to 50% fewer fasteners
- Single membrane width with no cover strips reduces welding and material costs
See isoweld® in action
See the future of induction welding in action with a full introduction video and a real-world isoweld® B case study.
What is isoweld®?
The isoweld® system uses induction technology to weld single ply membrane to dedicated stress plates, securing it to the roof deck. The innovative system increases efficiency, ensures security and saves on cost.
The isoweld® system comprises of:
isoweld® induction tool
A user-friendly and ergonomic stand-up induction welding tool.
It contains integrated safety and security features, such as search & control functions, temperature & power compensation, quick & simple calibration process, ensuring proper and correct welds.
Hand welding tool
This has a flexible 6m cable, for use in narrow, vertical and tight roof spaces. It's used in conjunction with the isoweld® induction tool.
Magnet set
Set of 10 magnetic heatsinks, which are positioned on the waterproofing membrane over the FI-P stress plate to apply pressure and to dissipate heat. Extension rods included for working in an up-right position.
SFS Load distribution Plates
The FI-P-6,8 is suitable for an all-metal fixing application, whilst the FI-P-16,0 is usable with the FI-R-20 sleeves. There are 3 versions of the SFS load distribution plates, in 3 distinct colours, designed to be suitable with PVC, TPO & EPDM membrane types.
SFS FI-R-20 Sleeves
SFS FI-R-20 sleeves are from temperature resistant polyamide, making it suitable in induction welding applications. The FI-R-20 sleeves are designed with a low profile, to help prevent ghosting and has an optimised tip for easier installation.
SFS High Performing Fastener
SFS have a large range of fasteners compatible with the Isoweld® fastening system, available for all substrates.
The isoweld® fasteners and stress plates are covered under our Flat Roofing ETA-23/0859, our isoweld® EPD and FM approved options are available.
The isoweld® system utilises the benefits of mechanically fixing, whilst provides a non-penetrating fixing solution to the membrane.
What is induction welding?
Induction welding is an alternative flat roof fixing method for securing PVC, TPO and EPDM membranes. Flat roofs must withstand high wind loads, as such the secure attachment of thermal insulation and single ply membrane to the substrate is critical. Induction welding uses high-frequency electrical currents to heat metal plates, fusing them to the membrane itself.
Its speed, precision, and versatility make it a preferred fixing method for many installers.
How does isoweld® work?
To install use the isoweld system with a streamlined, repeatable approach, follow this 3 step process.
01
Position the membrane
The single-ply waterproofing membrane is placed over the specially coated load distribution plates which are secured to the substrate via a fastener or fastener/sleeve combination.
02
Heat the plate
An isoweld® tool is placed on the single-ply waterproofing membrane directly over the load distribution plate and heats the load distribution plate to a predefined temperature.
03
Secure the bond
Once the welding process has been completed, a magnet heatsink is placed onto the single-ply waterproofing membrane over the load distribution plate, securing the bond.
New Advancement
Introducing isoweld® B
Innovation is at the core of SFS, we are continuing to find new ways to advance our technology and improve our customer's experience. Isoweld® is no exception, with 2025 seeing the launch of the next generation of isoweld® technology: isoweld® B.
The first of its kind, isoweld® B is powered by batteries, providing users with a cordless option.
- Cordless battery-powered operation
- Same welding performance as mains-powered unit
- Enhanced mobility for large roof areas
- Quick-change battery system
- Integrated digital temperature control
- Lightweight ergonomic design
Compatible product for use with isoweld®
Carbon Steel isoweld® Stress plate
- Carbon Steel material
- Stress plates suited for PVC, TPO and EPDM membranes
- Compatible with the FI-R-20n sleeve
- ETA-23/0859, FM Approved and EPD approval.
FI-R-20
- Heat resistant material
- ETA-23/0859, FM Approved and EPD approval.
- Optimised sleeve tip for reduced penetration force
- Universal Sleeve design for various applications and combination
BS-S-4,8
- Stainless steel quality A4, 1.4401, AISI 316
- Optimised shape of the bi-met drill tip, for effective drilling
- High pull-out values with asymmetric fastener thread
- ETA-23/0859 and EPD approval.
isoweld®
Precision Induction Welding
The isoweld® fastening system uses induction welding to secure single ply membranes to dedicated stress plates, delivering a non-penetrating fastening solution. The innovative system increases installation efficiency, ensures security, and reduces overall project costs.
50%
Potential fewer fasteners
Cost savings advantage
3s
Welding time
Fast welding, speedy installation
20%
Potential savings
On the total install cost
40m+
Square meters
Successfully installed worldwide
The benefits of isoweld®
The Isoweld induction welding machine provides multiple benefits for efficient and high-quality welding.
Efficiency
- Induction welding achieves secure welds in as little as 3 seconds, significantly speeding up installation
- Membrane-compatible wheels improve roof manoeuvrability and productivity
Security & Reliability
- Search and Find functionality keeps the tool aligned on the plate and prevents welding if misaligned to avoid incorrect or partial welds
- Mechanical fixing supports pull-out testing and wind-load calculations
Ergonomics
- Height-adjustable handles support an ergonomic working position and reduce the need to bend down
- Improved installer comfort helps to reduce strain and supports productivity
Cost Efficiency
- Field-fixed positioning enables even fastener spacing without membrane penetration and may require up to 50% fewer fasteners
- Single membrane width with no cover strips reduces welding and material costs
See isoweld® in action
See the future of induction welding in action with a full introduction video and a real-world isoweld® B case study.
What is isoweld®?
The isoweld® system uses induction technology to weld single ply membrane to dedicated stress plates, securing it to the roof deck. The innovative system increases efficiency, ensures security and saves on cost.
The isoweld® system comprises of:
isoweld® induction tool
A user-friendly and ergonomic stand-up induction welding tool.
It contains integrated safety and security features, such as search & control functions, temperature & power compensation, quick & simple calibration process, ensuring proper and correct welds.
Hand welding tool
This has a flexible 6m cable, for use in narrow, vertical and tight roof spaces. It's used in conjunction with the isoweld® induction tool.
Magnet set
Set of 10 magnetic heatsinks, which are positioned on the waterproofing membrane over the FI-P stress plate to apply pressure and to dissipate heat. Extension rods included for working in an up-right position.
SFS Load distribution Plates
The FI-P-6,8 is suitable for an all-metal fixing application, whilst the FI-P-16,0 is usable with the FI-R-20 sleeves. There are 3 versions of the SFS load distribution plates, in 3 distinct colours, designed to be suitable with PVC, TPO & EPDM membrane types.
SFS FI-R-20 Sleeves
SFS FI-R-20 sleeves are from temperature resistant polyamide, making it suitable in induction welding applications. The FI-R-20 sleeves are designed with a low profile, to help prevent ghosting and has an optimised tip for easier installation.
SFS High Performing Fastener
SFS have a large range of fasteners compatible with the Isoweld® fastening system, available for all substrates.
The isoweld® fasteners and stress plates are covered under our Flat Roofing ETA-23/0859, our isoweld® EPD and FM approved options are available.
The isoweld® system utilises the benefits of mechanically fixing, whilst provides a non-penetrating fixing solution to the membrane.
What is induction welding?
Induction welding is an alternative flat roof fixing method for securing PVC, TPO and EPDM membranes. Flat roofs must withstand high wind loads, as such the secure attachment of thermal insulation and single ply membrane to the substrate is critical. Induction welding uses high-frequency electrical currents to heat metal plates, fusing them to the membrane itself.
Its speed, precision, and versatility make it a preferred fixing method for many installers.
How does isoweld® work?
To install use the isoweld system with a streamlined, repeatable approach, follow this 3 step process.
01
Position the membrane
The single-ply waterproofing membrane is placed over the specially coated load distribution plates which are secured to the substrate via a fastener or fastener/sleeve combination.
02
Heat the plate
An isoweld® tool is placed on the single-ply waterproofing membrane directly over the load distribution plate and heats the load distribution plate to a predefined temperature.
03
Secure the bond
Once the welding process has been completed, a magnet heatsink is placed onto the single-ply waterproofing membrane over the load distribution plate, securing the bond.
New Advancement
Introducing isoweld® B
Innovation is at the core of SFS, we are continuing to find new ways to advance our technology and improve our customer's experience. Isoweld® is no exception, with 2025 seeing the launch of the next generation of isoweld® technology: isoweld® B.
The first of its kind, isoweld® B is powered by batteries, providing users with a cordless option.
- Cordless battery-powered operation
- Same welding performance as mains-powered unit
- Enhanced mobility for large roof areas
- Quick-change battery system
- Integrated digital temperature control
- Lightweight ergonomic design
NBS Source Specification
View the full Isoweld® product specification directly from NBS Source, including technical data and compliance details for quick and easy referencing.
Compatible product for use with isoweld®
Carbon Steel isoweld® Stress plate
- Carbon Steel material
- Stress plates suited for PVC, TPO and EPDM membranes
- Compatible with the FI-R-20n sleeve
- ETA-23/0859, FM Approved and EPD approval.
FI-R-20
- Heat resistant material
- ETA-23/0859, FM Approved and EPD approval.
- Optimised sleeve tip for reduced penetration force
- Universal Sleeve design for various applications and combination
BS-S-4,8
- Stainless steel quality A4, 1.4401, AISI 316
- Optimised shape of the bi-met drill tip, for effective drilling
- High pull-out values with asymmetric fastener thread
- ETA-23/0859 and EPD approval.
Frequently Asked Questions
No. The isoweld® system is specifically designed to work with PVC, TPO, and EPDM single-ply membranes without penetrating the waterproofing layer.
Induction welding heats the specially coated stress plate beneath the membrane, causing the membrane to bond securely to the plate without piercing the waterproof layer. This maintains the integrity of the membrane while providing a secure bond to the roof deck.
The bond created through induction welding is strong, consistent, and engineered for demanding roof environments.
The system combines the structural reliability of mechanical fixing with a welded bond to the membrane, allowing designers to perform wind load calculations and pull-out testing in accordance with industry standards. The system is supported by ETA approval and a weld warranty, providing verified performance data.
No. The isoweld® system is designed to be simple and intuitive for roofing installers.
The stand-up welding tool includes integrated search, alignment, and calibration functions that guide the operator to the correct plate location and ensure proper welding temperatures. With training and support from SFS experts, most installation teams can become confident with the system quickly.
In many cases, isoweld® can significantly improve installation efficiency.
Secure welds can be achieved in as little as three seconds, and the field-fixed installation method can reduce the number of fasteners required by up to 50% in certain zones. The system also eliminates the need for cover strips and additional membrane welding, helping installers complete large roof areas more quickly.
Yes. The isoweld® system is particularly effective on large flat roof projects, where installation speed and consistency are critical.
Over 40 million m² of roofing worldwide has been installed using isoweld®, and contractors have reported significant time and cost savings on projects exceeding 3,000 m².
Not necessarily.
The latest generation isoweld®-B system is battery powered, eliminating the need for generators or long power cables on the roof. Batteries can be charged directly on site and swapped quickly using the quick-change battery system, allowing continuous installation with improved mobility.
Yes.
The isoweld®-B system delivers the same welding performance as the mains-powered unit, while providing the added benefits of cordless operation. This allows installers to maintain consistent welding performance while improving freedom of movement across large roof areas.
The system supports safer roofing installation in several ways:
- Stand-up installation reduces strain on installers
- Cordless operation reduces trip hazards
- Fewer materials and welds simplify the installation process
- Integrated tool controls help ensure correct welds
These features help improve installer comfort and support safer working practices on roofing projects.
No.
The isoweld® system integrates with a wide range of SFS fasteners suitable for steel, timber, and concrete substrates, allowing contractors to select the appropriate fixing solution for each project while benefiting from the efficiency of induction welding.
SFS provides training, demonstrations, and on-site support to help contractors adopt the system with confidence.
This includes tool setup, calibration guidance, and practical demonstrations to ensure installation teams can achieve consistent, reliable results from day one.
isoweld®-B combines several advantages in one system:
- Battery-powered cordless operation
- Fast three-second welding cycles
- Stand-up ergonomic installation
- Reduced fastener usage
- Consistent and reliable weld quality
Together, these features help contractors install large flat roofs faster, safer, and more efficiently.
Still have questions?
Contact our technical team →