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NBS Source


Suitable for timber walls, metal frame systems, masonry and internal insulation upgrades.


A durable, lightweight, breathable Single layer membrane with enhanced water resistance and airtightness that provides long-lasting protection against the elements.

Features and benefits:

  • Durable, lightweight and flexible.
  • Easy to install.
  • Wind-tight and water-resistant.
  • UV-resistant.
  • Increased energy efficiency.
  • Provides air and moisture management for commercial and residential buildings.
  • Long-term performance.
  • BBA-approved and CE-marked.

General information








100 mm


1.4 mm

2.7 mm


15 year


Pr_25_57_10_94 Vapour-permeable sheetsPrimary


H20/10 Sheet cladding

H20/150 Sheet cladding

H20/155 Sheet cladding

H21/10 Vertical timber weatherboarding

H21/110 Vertical timber weatherboarding

H21/111 Horizontal timber weatherboarding

H21/115 Vertical timber weatherboarding

H21/116 Horizontal timber weatherboarding

H21/130 Breather membrane

H21/15 Horizontal timber weatherboarding

H21/20 Breather membrane

H30/350 Breather membrane

H31/280 Breather membrane

H92/120 Rainscreen cladding

P10/320 Breather membrane

P10/65 Breather membrane

Specification data - Vapour-permeable sheets


To BS EN 13859-2.

Performance characteristics

Water resistance.

Air tightness.

Class (minimum)






Third-party certification

British Board of Agrément (BBA) Certificate.

Weight (minimum)

58 g/m².

Thickness (minimum)

0.175 mm.


Tyvek® Acrylic Tape.

Single-sided tape for sealing overlaps and making good around penetrations, pipes and windows. Recommended for all Tyvek membranes. Made of Tyvek and acrylic adhesive for durable and long-lasting bonding.

Tyvek® Butyl Tape.

Double-sided butyl-based sealant, used to seal fixing penetrations in a Tyvek membrane, and form a moisture and airtight seal between a Tyvek membrane and most commonly used building materials. Tape is compatible with brickwork, blockwork, masonry, timber, metalwork and most plastic products.

Tyvek® Double Sided Tape.

Double-sided acrylic tape for sealing laps in Tyvek membrane and bonding to smooth surfaces. Excellent adhesion properties under extreme conditions. Strong initial tack.

Tyvek® FlexWrap EZ.

Narrow width, high performance and heavy duty adhesive tape with good flexibility. The pleated Tyvek® base layer allows the tape to be formed around small and complicated penetration details. Developed to provide sealing against water penetration and achieve efficient vapour and air-tightness.

Tyvek® FlexWrap NF.

High performance flexible self-adhesive flashing tape. It provides excellent watertight adhesion to all Tyvek® breather membranes around non-straight penetrations such as dormers, door sills, chimney breasts, pipe penetrations and any custom shapes.

Third party certifications

  • 90/2548

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