Universal Vapour Permeable Underlay
Verified by manufacturer 5 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