Permo Forte Breathable Felt

Klober Permo Forte 145 Breathable Roof Membrane

The Klober Permo Forte 145 is the strongest breathable roofing membrane in Klober’s specialist range, designed to provide superior protection for pitched roofs while allowing moisture to escape. Ideal for both cold and warm roof applications, this four-layer, vapour-permeable membrane features a built-in reinforced safety grid, offering added strength and reliability during installation and throughout the roof’s life.

Advanced Breathable Technology

Permo Forte 145 is engineered to control condensation effectively, ensuring that moisture vapour can escape while preventing water ingress. Its low resistance (LR) design conforms to BS 5250, making it a reliable solution for pitched roof ventilation and moisture management.

Durable and High-Performance

Four-layer, reinforced membrane with built-in safety grid Tear-resistant, lightweight, and flexible for easy installation Water penetration resistance: W1 Tensile strength: 430/370 N/50mm (MD/CD) Nail tear strength: 320/340 N (MD/CD) Elongation: 20/15% (MD/CD) Fire rating: EN 13501-1: E Temperature resistance: -40°C to +80°C

Practical Applications

Permo Forte 145 can be installed in both fully supported and unsupported roof systems, making it suitable for a wide range of pitched roof projects. It is effective in all wind zones (with appropriate headlap and batten gauge) and is compatible with battened or taped headlaps, providing versatility for both new builds and refurbishments.

Product Details

Brand: Klober Colour: Light grey Weight: 145 g/m² Width & Length: 1.5m x 50m (75 m²) or 1.1m x 55m (60.5 m²) Packaging: Pallet quantities – 20 rolls (1.5m x 50m), 24 rolls (1.1m x 55m) Guarantee: 10-year manufacturer guarantee against defects

Approvals & Standards

BBA approved (cold vented / warm non-vented / cold non-vented) NSAI approved CE & UKCA marked Manufactured to BS EN 13859-1:2010

Frequently Asked Questions

1. What makes Permo Forte 145 different from standard breathable membranes?

Permo Forte 145 features a **four-layer construction with a built-in reinforced safety grid**, making it stronger, more tear-resistant, and safer to handle than standard membranes.

2. Can this membrane be used for both cold and warm roof systems?

Yes. Permo Forte 145 is suitable for **cold, warm, vented, and non-vented roof applications**, offering versatile performance for a variety of roof types.

3. How does it help with condensation?

Its **vapour-permeable design** allows moisture to escape from the roof structure while preventing water ingress, effectively reducing the risk of condensation build-up and protecting timber and tiles.

4. Is Permo Forte 145 compliant with building standards?

Yes. It is **BBA approved, NSAI approved**, CE/UKCA marked, and manufactured to **BS EN 13859-1:2010**, ensuring compliance with UK and European roofing regulations.

Check out our full range of roofing supplies.

Browse more breathable felts available online.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.