DuPont™ Tyvek® Supro


DuPont™ Tyvek® Supro Roof Underlay

Drawing from more than 20 years of international manufacturing experience in the field of construction, DuPont™ Tyvek® Supro is a roof underlay that has been proven worldwide to be durable and to perform in extreme environments.


DuPont™ Tyvek® Supro Roof Underlay

An underlay is a key component of the roofing structure, and provides an important element in the weather tightness of a roof cladding system. The underlay acts as a secondary barrier to water ingress from the external environment while also helping to control internally generated moisture. Their function in terms of building durability is important and their on-going performance needs to be preserved to guarantee the life of the building


Features & benefits

Feature Benefit
Functional layer of high density polyethylene (HDPE) interwoven fibers
  • Functional layer of high density polyethylene (HDPE) interwoven fibers Provides a robust, durable and UV resistant underlay to stand up to the rigours of construction.
  • Vapour permeable
  • Allows vapour to pass through the membrane minimising the build-up of condensation
  • Synthetic composition
  • Can be exposed to adverse conditions during installation without affecting future durability or performance
  • Flame retardant
  • Will not support combustion

    Physical properties

    Method Unit Value
    Duty Classification Table 1 AS/ aNZS 4200.1:2017 - Extra Light
    Vapour Permeability ASTM E96 µg/N.s > 3.5
    Vapour Resistance ASTM E96 MN.s/g < 0.3
    Vapour Control Classification ASTM E96 - Class 4
    Emittance AS/NZS 4201.5 - Non-reflective
    Water Barrier AS/NZS 4201.4 - Water barrier
    Absorbency AS/NZS 4201.6 - Unclassified
    Resistance to Dry De-Lamination AS/NZS 4201.1 - Pass
    Resistance to Wet De-Lamination AS/NZS 4201.2 - Pass
    Shrinkage AS/NZS 4201.3 % 100
    Electrical Conductivity Classification AS/NZS 3100 - non-conductive
    Folding Endurance (MD) AS/NZS 1301.423 - pass
    Folding Endurance (CD) AS/NZS 1301.423 - pass
    Mechanical Strength - -
    Tensile (MD/CD) AS 1301.448 kN/m 6.3 & 5.0
    Edge Tear (MD/CD) TAPPI T470 N 305 & 254
    Burst Strength AS2001.2.19 N 356
    Flammability Index AS/NZS 1530 Part 2 - ≤ 5
    Weight / Width - gsm/mm 145/1500
    Length - m 50
    Area - m2 75

    An underlay needs to:

    • Resist water and air penetration from above

    • Facilitate water vapour transmission from within by retaining and releasing condensed water as required

    • Protect insulation – thus promoting energy efficiency

    The long-term performance of any underlay (Kraft or synthetic) can be highly dependent on the environmental conditions it is exposed to within the roof cavity. Condensation and moisture related issues can be managed by careful consideration of the roof design, ventilation used and climatic conditions of the area. Refer to the DuPont™ Tyvek® Supro technical datasheet for specific requirements.

    Tyvek® Supro Metal - Protect Your Roof with a Metal Roofing Underlay.

    DuPont™ Tyvek® Metal is a roofing drainage underlay which drains away the condensation that can build up beneath the cladding on standing seam metal roofs.

    Tyvek® Metal roofing underlay is vapour-permeable, yet water-resistant and airtight. When used in combination with genuine Tyvek® accessories it can help to reduce condensation, improve overall airtightness, add thermal efficiency, and protect structural integrity.

    Besides allowing condensation beneath stainless steel, aluminium, copper, and zinc roofs to drain away, Tyvek® Metal also reduces sound transmission such as rain clatter, and minimises material stress by permitting a degree of movement between the cladding and the timber beneath.

    Key Benefits of DuPont™ Tyvek® Metal

    • Water-resistant

    • Airtight

    • Vapour-permeable

    • Allows movement and reduces material stress by providing separation between metal sheets and timber substrate.

    • Reduces rain clatter and sound transmission.

    Fitting Tyvek® Metal

    Tyvek® Metal roofing drainage underlay is fitted beneath standing seam metal sheet roofs and the underlying timber boarding. The use of 150mm wide timber boarding with 2mm gaps between is recommended.