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DuPont™ Tyvek Reflex - Reflective Breather Membranes

Tyvek Reflex is a vapour open underlay with a metallised surface that reflects radiant heat in summer and helps to reduce heat loss in winter. It can be used in timber frame walls as well as metal frames, masonry and internal insulation upgrades.

Get the wall U Value down to 0.22 and improve your thermal performance on a 140 mm STUD size using Mineral Batt at 0.032 along with Tyvek Reflex and DuPont™ AirGuard Reflective.

Product Functions

Tyvek Reflex - Internal and External Wall Reflective Membrane

With an emissivity value of 0.05 Tyvek Reflex is a vapour open underlay with a metallised surface that reflects radiant heat. It is entirely suitable for use in timber frame, metal stud, internal and external wall insulation applications.

The low emissivity surface (0.12) results in a highly reflective product (88%) for an improved thermal comfort and an enhanced airtightness of the construction.

Tyvek Reflex - Product PropertiesTyvek Reflex Insulating Breather Membrane, a low emissivity, insulating, membrane for external walls in timber-frame constructions

  • Wind-tight and water resistant but vapour-open
  • Low emissivity surface (0,12) results in highly reflective product (88 %) for improved thermal comfort
  • Enhances the airtightness of the construction
  • Lightweight, flexible and easy to install
  • Can be left uncovered for up to 4 months while retaining full performance
  • Long-term performance
  • Trusted performance and proven durability.
  • The first Reflective Breather Membrane for thermal management successfully installed in the UK since 2002
  • Suitable in timber frame walls as well as metal frames, masonry and internal insulation upgrades
  • Saves money with an Airtight and more Energy Efficient construction for the lifetime of the building
  • Fully BBA certified (No 90/2548) helps to meet requirements of Part L in England and Wales and of Scottish Technical Standard 6
  • Approved by UKTFA - covers Compliance with Codes & Standards

Tyvek Reflex - Product characteristics (nominal) ...


 High Density Polyethylene

 Roll Size

 1.50m x 100m

 2.40m x 100m

 2.70m x 100m

 Roll weight  13 kg  20.5 kg

 23 kg

 Mass per unit area

 84 gr/ m2

 UV exposure

 4 months

 Product thickness = Functional layer thickness

 220 µm



 Water vapour transmission (Sd)

 0.03 m

 CE marking


 BBA Certificate

 No 90/2548

Thermal Values

  • Structural timber stud dimensions are critical factors especially in prefabricated units and increasing stud depths is not always practical.
  • Despite this, stud sizes may need to be increased to accommodate more insulation in order to comply with the thermal regulations.
  • Tyvek Reflex can help to alleviate this due to the additional thermal resistance that it provides.
  • The thermal benefit provided by Tyvek Reflex compared to a standard breather membrane is demonstrated in below tables including the usage of the airtight vapour control layer DuPont™ AirGuard Reflective.

Product Price List and / or Add to Cart

Availability: Specialist product not so  readily available. Allow 1 - 9 working days for delivery

Price List: Tyvek Reflex  - Reflective Breather Membrane for Masonry and External Wall Upgrades

1. Click items below for pricing structure. 2. Click Tick-Box to select one or more items. 3. Click Add to Cart Button.

Our Prices are currently being revised please contact us for the latest prices

Rarely requested product sourced directly from manufacturer. Du-Pont Tyvek Double-sided Acrylic Tape, 50mm x 25m = 25lm - start at £16.12
Rarely requested product sourced directly from manufacturer. Du-Pont Tyvek Tape, 75mm x 25m = 25lm - start at £23.19
Less popular product commonly available at selected depots. Du-Pont Tyvek Metalised tape, 75mm x 25m = 25lm - start at £31.39

Tyvek Reflex - Price and Availability Advisory

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Availability relies on stock levels at closest depots and upon transport logistics to effect deliveries

Product Information and Certification

Links to manufacturer's information. Click to download in a separate browser window.

Dupont Tyvek Reflex Datasheet | Tyvek Reflex BBA Certificate

Priced on Application:

Generally, Products are readily available

Estimates for large quantity orders can be priced on application. Please contact us to discuss such matters.

Contact us directly for further information: Telephone 0333 8000 828  - Email: Click Here:

Contact Manufacturer

DuPont™ Tyvek

Tyvek Breather Membranes leading manufacturer of air and vapour building control layers

Unit 29, Hither Green Estate, Clevedon, North Somerset, BS21 6XU
Telephone: +44(0) 1275 337660
Facsimile: +44 (0) 1275 879 033
Web site:

Contact us

Insulation Online Limited

Sales Office only:39 Normandy Road, Worthing, West Sussex, BN14 7DX, UK

Telephone: 0333 8000 828


Web site: - we always deliver top quality products, competitive pricing and an efficient caring service