Glidevale Protect Viking Air - Air Open Underlay

Glidevale Protect Viking Air is a new, premium type 'LR' roof underlay with high air and vapour permeability, for use in warm and cold pitched roof constructions, helping to avoid the risk of harmful condensation without the need for additional ventilation as permitted by the NHBC for a cold roof construction. Designed with market leading air permeability at 50 Pascals to BS EN 12114, the underlay also achieves wind uplift resistance to Zones 1-4* at 345 mm batten gauge to BS 5534, ensuring wide coverage across the UK and throughout Ireland.

*Meets Zones 1-4 at 345 mm batten gauge (resistance to wind pressure 1569 Pa) without the need for additional counter batten or integral tape. Achieves unrestricted use for wind uplift Zones 1-5 at 310 mm batten gauge (2121 Pa) or when installed on sarking board.

Features and benefits:

• Superior airflow permeability –>78 m³/m²/hr at 50 Pascals to BS EN 12114.
• Hydrophobically treated underlay which provides additional water shedding qualities and water penetration resistance.
• Highly vapour permeable with a performance better than required in BS 5250. 
• Completely watertight with >1.0 m head of water resistance.
• Does not generate nuisance noise under wind loading.
• BM TRADA independently certified and CE marked for added reassurance in specification.
• Achieves Zones 1–4 at 345 mm batten gauge (1569 Pa) wind uplift resistance to BS 5534. 
• Achieves unrestricted use for wind uplift Zones 1-5 at 310 mm batten gauge (2121 Pa) or when installed on sarking board.
• Tough and durable, yet easy to cut and handle, with flexibility at low temperatures.
• Helps to avoid condensation risk within the roof space in accordance with BS 5250 and NHBC requirements.
• Can be used in cold roof construction without additional roof space ventilation as permitted by NHBC.