Universal Vapour Permeable Underlay
Verified by manufacturer 14 days ago
BBA Agrément Certificate
Certificate type
BBA Agrément Certificate
Certificate type
BBA Agrément Certificate
Certificate type
Low resistance, lightweight, vapour permeable underlay used as part of a roofing or vertical cladding system.
Application
Suitable for use as a vapour permeable underlay.
Description
Universal Vapour Permeable underlay is a high-performance, breathable roof membrane using a multi-layer bonding process of polypropylene laminates. The underlay is a strong, durable, easy-to-install under-tile layer suitable for warm or cold roof applications.
Features and benefits:
- BBA approved.
- UV resistant.
- High tensile and tear strength.
- Integrated tape system for sealing underlay laps.
- Provides a vapour-permeable underlay system with wind-uplift resistance.
- Unrestricted usage in wind zones 1–5, and fully compliant with BS 5534.
- No need to increase laps to coincide with tile batten courses, minimising cost.
- No need to use an additional ‘fly’ batten to secure laps.
- Printed guidance lines provide a visual reference to ensure sufficient lap to the British Standard.
- Ensures that the underlay is laid consistently and straight.
General information
Color | Red |
Finish | Textured |
Material | Polypropylene |
Shape | Rectangle |
Length | 50000 mm |
Width | 1000 mm |
Height | 0.6 mm |
Warranty description | 15 year |
Uniclass | |
CAWS | H65/235 Vapour-permeable underlay H67/24 Vapour-permeable underlay H64/22 Vapour-permeable underlay H60/22 Vapour-permeable underlay P10/65 Breather membrane H91/305 Vapour-permeable underlay H60/235 Vapour-permeable underlay H65/22 Vapour-permeable underlay H61/22 Vapour-permeable underlay H61/235 Vapour-permeable underlay H67/290 Vapour-permeable underlay H64/307 Vapour-permeable underlay P10/320 Breather membrane H62/235 Vapour-permeable underlay |
SKU Code | MA33150 |
Specification data - Vapour-permeable sheets
Standard | To BS EN 13859-1 and BS EN 13859-2. |
Class (minimum) | W1. |
Third-party certification | British Board of Agrément (BBA) certificate. |
Performance criteria | |
Water vapour properties | Water vapour resistance: 0.145 MN·s/g. |
Fire performance | Reaction to fire: To BS EN 13501-1, Class E. |
Tensile properties | Tensile strength in machine direction: before artificial ageing: (400 ± 80) N/50 mm, after artificial ageing: (≥50%) N/50 mm. Tensile strength in cross machine direction: before artificial ageing: (260 ± 50) N/50 mm, after artificial ageing: (≥50%) N/50 mm. |
Material | Polypropylene. |
Form | Non-woven. |
Weight (minimum) | 170 g/m². |
Thickness (minimum) | 0.6 mm. |
Elongation | Longitudinal direction: 80%. |
Tear resistance | Longitudinal direction: 190 N. |
Sustainability data
Country of product manufacture | United Kingdom |
Material | Polypropylene |
Expected Life | 60 year |
Product certifications
BBA Agrément Certificate
BBA - MARLEY UNIVERSAL VAPOUR PERMEABLE UNDERLAY FOR USE IN COLD NON-VENTILATED ROOFS
BBA Agrément Certificate
BBA - MARLEY UNIVERSAL VAPOUR PERMEABLE UNDERLAY FOR USE IN TIMBER FRAME CONSTRUCTION
BBA Agrément Certificate
BBA - MARLEY UNIVERSAL VAPOUR PERMEABLE UNDERLAY FOR USE IN WARM NON-VENTILATED AND COLD VENTILATED ROOFS
Literature
Marley Roofing Accessories Brochure