Klober Permo Forte 145 Breathable Roofing Membrane 1.5m x 50m
Choose maximum strength and long-term protection with the Klober Permo Forte 145 Breathable Roofing Membrane. As Klober's strongest breathable roof membrane, this premium four-layer underlay combines exceptional durability, waterproof protection and outstanding vapour permeability to help create a healthier, longer-lasting roof structure.
Unlike standard breathable membranes, Permo Forte 145 incorporates an integrated reinforcing grid within its four-layer construction. As a result, it offers significantly greater resistance to tearing, accidental damage and foot traffic during installation. Furthermore, the reinforced design provides additional safety for roofing professionals while maintaining excellent flexibility across the roof.
Moreover, the membrane allows moisture vapour to escape from inside the roof while preventing wind-driven rain and snow from entering the building. Consequently, it helps minimise condensation, protects insulation performance and reduces the risk of timber decay throughout the roof structure.
Designed for both supported and unsupported installation, Klober Permo Forte 145 performs exceptionally well in warm roof and cold roof constructions. Therefore, it provides one versatile solution for new-build developments, roof refurbishments and demanding roofing projects across all UK wind zones when installed in accordance with current guidance.
Why Choose Klober Permo Forte 145?
Professional roofers need a membrane that delivers exceptional strength without compromising breathability. Therefore, Klober developed Permo Forte 145 to provide maximum durability alongside excellent moisture management.
Furthermore, the membrane achieves outstanding tensile strength of 430N/50mm longitudinally and 370N/50mm transversely, while also offering exceptional nail tear resistance. Consequently, it withstands the demands of busy construction sites far better than many standard roofing membranes.
In addition, Permo Forte 145 carries full BBA Approval, CE Marking and complies with BS 5534 requirements for pitched roofing underlays. Therefore, architects, builders and roofing contractors continue to specify it for high-performance roofing systems throughout the UK.
Key Features & Benefits
- Klober's strongest breathable roofing membrane
- Premium four-layer reinforced construction
- Built-in reinforcing safety grid
- Excellent tear and puncture resistance
- Waterproof while remaining vapour permeable
- Helps reduce harmful roof condensation
- Suitable for warm and cold roof applications
- Can be installed fully supported or unsupported
- UV stable for up to four months
- Lightweight yet exceptionally durable
- BBA Approved low resistance membrane
- CE Marked
- Suitable for all UK wind zones when correctly installed
- Professional roofing performance
- 10-year manufacturer guarantee
Installation Advice
Firstly, install the membrane horizontally across the rafters with the printed side facing outwards. Next, overlap each course in accordance with BS 5534 and Klober's installation recommendations. Then, secure the membrane using counter battens and tiling battens before completing the roof covering.
Furthermore, ensure all laps remain correctly sealed where required, particularly in exposed locations. Consequently, the membrane will provide optimum weather protection, condensation control and long-term roofing performance. Additionally, always follow the current manufacturer's installation instructions and Building Regulations.
Trusted Klober Quality
For decades, Klober has supplied innovative roofing ventilation and roofing membrane systems trusted by contractors throughout the UK and Europe. Furthermore, Permo Forte 145 forms part of Klober's Specialist Membrane range, offering the highest level of strength and durability within the collection.
Whether you are constructing a new roof or upgrading an existing roofing system, Klober Permo Forte 145 delivers outstanding waterproof protection, exceptional tear resistance and reliable long-term performance for even the most demanding roofing projects.









