Enviroseal ProctorWrap High Tensile Roof


Enviroseal™ ProctorWrap™ High Tensile-Roof (HT-R) is a highly durable medium duty vapour permeable roof underlay for use in tiled, slate and metal roof applications.

Product Description

Enviroseal™ ProctorWrap™ HT-R is a UV stabilised tear resistant 3-ply spun bonded polyolefin membrane with reinforcement scrim for use in commercial and residential roofing applications. Enviroseal™ ProctorWrap™ HT-R offers a combination of durability and high water holdout without compromising vapour permeability to help protect the
building fabric and insulation from condensation and related problems such as mould, timber rot, corrosion and loss of thermal resistance.


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Enviroseal™ ProctorWrap™ HT-R shall be installed in accordance with AS/NZS 4200.2 Pliable Building Membranes and Underlays, Part 2 Installation Requirements, and with the printed face upwards.

For tile and slate roof applications, Enviroseal™ ProctorWrap™ HT-R should be laid horizontally across the rafters starting at the eaves with adequate drape to allow drainage of moisture, and secured in place with battens and/or counter-battens.

For metal sheet roof applications, Enviroseal™  ProctorWrap™ HT-R should be laid so it forms a continuous membrane over the entire area of the roof, allowing any water to drain down to the gutters.

On low pitch metal roofs, excessive draping of Enviroseal™ ProctorWrap™ HT-R between purlins can result in ponding which is unsatisfactory and should be avoided.It is preferable for Enviroseal™ ProctorWrap™ HT-R to be fully supported to give a clear drainage path. If not practical on low pitch roofs then laps should be taped using ProctorWrap™ SLS tape to prevent water ingress to the insulation below.


  • High water resistance
  • Medium duty
  • Highly durable
  • Non-perforated
  • Highly vapour permeable
  • Air tight
  • Superior nail seal performance
  • Soft facings reduce flapping noise



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Enviroseal ProctorWrap HT-R 
is available exclusively from 
CSR Bradford 1300 850 305



Enviroseal ProctorWrap HT-R



  Criteria   Result Result
  Duty Classification   Table 1 AS/NZS 4200.1:1994   Medium
  Vapour Permeability

  ASTM E96


  Vapour Resistance

  ASTM E96   0.25MN.s/g

  Vapour Barrier Classification

  ASTM E96


  Emittance   AS/NZS 4201.5   Non-reflective
  Water Barrier

  AS/NZS 4201.4



  AS/NZS 4201.6   Unclassified
  Resistance to Dry De-Lamination   AS/NZ 4201.1   Pass
  Resistance to Wet De-Lamination   AS/NZ 4201.2   Pass


  AS/NZ 4201.3


  Tensile Strength

  • Machine Direction (kN/m)
  • Lateral Direction (kN/m)

  AS 1301.448

  10.3 kN/m 
  7.9 kN/m

  Edge Tear Resistance

  • Machine Direction (N)
  • Lateral Direction (N)

  TAPPI T470

  505 N 
  397 N

  Burst Strength


  573 N

  Flammability Index

  AS/NZ 1530 Part 2    ≤ 5

  Allowable UV exposure prior to  
  completion of cladding

    2 months


Standard Sizes & Packaging 

Width Length  mper roll  Weight per roll
 1500mm  50m   75m2  18kg 

Enviroseal™ ProctorWrap™ Tape Range

When required to secure, join or seal Enviroseal™ ProctorWrap HT-R it is recommended to use the following
Enviroseal ProctorWrap accessory products in each of these applications.

 Application Product   Width  Length 
 Sealing joins Enviroseal ProctorWrap HighTack Tape  60mm  25m
 Sealing around penetrations ProctorWrap SLS Flexi 60mm 5m


Sample specification


Sarking underlay should be CSR Bradford Enviroseal™ ProctorWrap™ HT-R vapour permeable roofing underlay, tested to AS/NZS 4200,1:1994 standards, secured in accordance with product user guide. Bradford Enviroseal™ ProctorWrap™ HT-R should be laid under the roofing material and above the insulation to form a continuous membrane over the entire area of the roof, allowing any water to drain down to the gutters. On low pitched roofs if Enviroseal™ ProctorWrap™ HT-R is unsupported, laps should be taped with ProctorWrap™ SLS Tape to prevent moisture draining back into the insulation. Foil type sarkings do not comply with this specification.

Summary Specification:

  • Vapour permeability: No less than 4.0μg/N.s 
    (vapour resistance of no greater than 0.25MNs/g)
  • Water Barrier Classification: High
  • Duty classification: Medium
  • Burst Strength: > 500N 
  • Emmitance: Non-reflective











PH: 1800 174 900 



Proctor Group Australia


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