Cromar 3B Bonding Felt 36kg (20 m × 1 m) is a heavy-duty bitumen-impregnated roofing felt designed for use as a bonding underlay in built-up roofing systems on flat or low-slope roofs. It is typically applied over suitable decking such as timber or concrete and bonded using hot bitumen or cold adhesive to create a durable intermediate layer that improves waterproofing performance and adhesion between roofing layers. The product is suitable for refurbishment and new roofing installations where a strong, tear-resistant reinforcement layer is required. However, it should not be used as a standalone waterproofing layer or final cap sheet, and it is not suitable for steep pitched roofs or areas with heavy foot traffic unless protected by additional roofing layers. Installation should be carried out on clean, dry substrates and in appropriate weather conditions, as moisture, frost, or extreme temperatures can affect bonding performance.
Cromar 3B Bonding Felt 36kg 20 x 1m
£68.98 inc. VAT
£57.48 ex. VAT
- Brand: cromar
- Manufactuer: cromar
Cromar 3B Bonding Felt 36kg (20m x 1m) is a high-performance, traditional roofing felt designed for use as a bonding layer in multi-layer built-up roofing systems. Manufactured with a strong fibre base and saturated with high-quality bitumen, it provides excellent durability, flexibility, and weather resistance. The 3B grade felt is specifically intended to be bonded using hot bitumen, helping to create a secure and reliable waterproof barrier when used alongside other roofing layers. Supplied in a convenient 20m x 1m roll weighing approximately 36kg, it offers consistent coverage and easy handling for professional roofers working on flat or low-slope roofing applications.
Cromar 3B Bonding Felt is a durable bitumen-saturated roofing felt designed primarily for use as a high-performance intermediate or top layer in multi-layer built-up roofing systems on flat or low-pitched roofs. It is commonly bonded with hot or cold bitumen to create a waterproof barrier that protects roofing structures from moisture penetration and weather exposure. The felt can be used in domestic, commercial, and outbuilding roofing projects, including garages, sheds, and extensions, where reliable roof reinforcement and long-lasting weatherproofing are required. Its heavy-duty construction helps improve roof strength, flexibility, and resistance to tearing, making it suitable for both new roofing installations and refurbishment work.
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| Elementlength | |||||||
| up to 1,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
up to 2,5 m |
up to 3,5 m |
up to 4,5 m |
|
| Type of window frame material |
Minimum witdth of joints for a butled mounting b in mm |
Minimum witdth of joints for a inner mounting b in mm |
|||||
| Hard PVC (white) | 10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Hard PVC and PMMA (dark) (colour extruded) |
15 | 20 | 25 | 30 | 10 | 15 | 20 |
| Hard PUR integral foam | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Wood-aluminium-window | 10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (bright) |
10 | 10 | 15 | 20 | 10 | 10 | 15 |
| Aluminium-plastic sandwich frame (dark) |
10 | 15 | 20 | 25 | 10 | 10 | 15 |
| Wooden window frame | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
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