Tyvek® Reflex


A heat reflective membrane that helps to improve thermal efficiency by reflecting radiant heat in summer and reducing convective heat loss in winter. As a strong, water-resistant breather membrane with a metallized surface, it is suitable for use in any wall system that requires secondary protection from external moisture. The low emissivity membrane is particularly effective in lightweight wall construction such as timber or metal frame systems and is also popular for masonry and internal insulation upgrades. It's airtight and water resistant, yet vapour-open, properties help to create an energy efficient construction that lasts the lifetime of the building.


  • Reflective breather membrane for timber/ metal frame and masonry wall systems.
  • High thermal performance due to low emissivity surface, provides 0.54 thermal resistance.
  • Keeps building cool inside by blocking 91% of radiant heat in summer.
  • Lightweight, flexible, easy to install.
  • Can be left uncovered for up to four months while retaining full performance.
  • Trusted performance and proven durability.
  • Fully BBA, BRE and TRADA certified; approved by UKTFA – covers compliance with codes and standards.
  • CE marked.

General information


Smooth reflective




Water resistant, breathable, strong, low emissivity


Polyethylene metallised




100 x 0.48, 100 x 1.5 and 100 x 2.7 m


10 years

Uniclass 2015

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

H30/10 Fibre cement

H30/110 Fibre cement

H92/120 Rainscreen cladding

M30/265 Building paper

P10/320 Breather membrane

P10/65 Breather membrane

Specification data - Vapour permeable sheets

Product Reference

Tyvek Reflex

Roll size

0.48 x 100 m

1.50 x 100 m

2.7 x 100 m



Tyvek® FlexWrap NF

Tyvek® Metallised Tape

Tyvek® Butyl Tape

Tyvek® Double Sided Tape

Standard product features

Mass per unit area:

84 g/m2.

UV exposure:

4 months.


220 µm.

Water vapour transmission (Sd):

0.03 m.



Product Options


- Tyvek® Metallised Tape:

Single sided tape composed of an acrylic adhesive on a metallised Tyvek carrier. For sealing laps in metallised Tyvek® membranes and making good around penetrations, pipework, windows and door openings. Roll size: 75 mm x 25 m.

- 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. Roll size: 50 mm x 25 m.

- 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. Roll sizes: 20 mm x 30 m, 50 mm x 30 m.

- Tyvek® FlexWrap NF:

A stretchable and flexible tape made up of three components: a crimped DuPont™ Tyvek® top sheet providing a water tight layer, the butyl mass as an adhesion layer and a paper release liner. 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. Roll size: 2280 mm x 22.9 m.

Digital objects

Platform Compatible Version Certified to




Revit 2016


Download now from NBS National BIM Library


Third party certifications

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