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Vapour Permeable Roof Underlay

Integrated tape system for sealing underlay laps
Provides a vapour-permeable underlay system with superb wind-uplift resistance
Unrestricted usage 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
Provides a visual reference to ensure sufficient lap to the British Standard
Ensures that the underlay is laid consistently and straight

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Description

Marley Universal Vapour Permeable underlay is a high-performance, breathable roof membrane for use in a range of pitched roof constructions.

Complete with an integrated tape system, this underlay provides and effective wind barrier with unrestricted usage across all UK wind zones (BS 5534).

Manufactured using a multi-layer bonding process of polypropylene laminates, the underlay is an ultra-strong, durable, and easy-to-install under-tile layer that is suitable for warm or cold roof applications.

Function & Compatibility

Each underlay is manufactured using the latest materials and processes, and each incorporates a number of useful features that assist in ensuring installation that is not only correct, but also compliant with the latest British Standards.

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For use in warm non-ventilated roofs and cold ventilated roofs

Download BBA certification

For use in cold ventilated roofs

Material	PP 3 layers
Weight	170 (-10+10)
Resistance to water penetration	W1
Batten gauge	<250 (Zone 1-5) <354 (Zone 1-5)
Adhesive tapes	1
Tests	CE, BBA, IBA approved
Tensile strength (N/50mm)
Before artificial aging	MD 400 (-80) CMD 260 (-50)
After artificial aging	MD > 50% CMD > 50%
Elongation (%)
Before artificial aging	MD 80 (-20)% CMD 100 (-22)%
After artificial aging	MD > 50% CMD > 50%
Tear resistance	MD 190 (-50) CMD 190 (-60)
Flexibility at low temperature	-60^oC
Equivalent air layer thickness (Sd)	0,029 (+/-0,01)
Reaction to fire	Class E (When tested to EN11925-2