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DriStud FRU36 —Fire Retardant Synthetic Self Support/Heavy Weight Roof Underlay

DriStud FRU36 is a white synthetic tri-laminate roofing underlay that is water resistant, vapour permeable and fire retardant.

The FRU36 is a self-support/heavy weight, roof underlay. It is intended for use on new and existing buildings in wind zones up to and including 'Extra High', as defined in NZS 3604:2011.

Key Features
  • CodeMark Certified
  • Can be installed over timber and steel roof framing
  • Fire retardant
  • Self-support
  • Breathable
  • Absorbent
  • Durability: 50 years
  • Can be direct fixed behind all claddings
Scope of Use
  • DriStud FRU36 is intended for use on buildings designed in accordance with NZS 3604:2011 paragraph 1.1 and in wind zones up to and including ‘Extra High’.
  • DriStud FRU36 is designed to be used as a replacement for standard kraft paper roof underlay.
  • It can be installed over both timber and steel framing to ensure a dry roof cavity.
  • DriStud FRU36 can be used under: masonry tiles, metal tiles, profiled metal roof claddings. However, DriStud FRU36 must be fully supported with a corrosion resistant material where roof pitch is less than 10 degree.

Where CodeMark is to be relied upon, then all conditions of that certificate must be met. These are:

  • Must be installed in accordance with the DriStud FRU 36 Installation Guide Rev 1.
  • DriStud FRU36 may be installed over timber and steel roof framing.
  • The certificate covers the use of DriStud FRU 36 under: masonry tiles, terracotta tiles, metal tiles, profiled metal claddings, slate and composite panels.
  • DriStud FRU36 can span upto 1200mm.
Statement of Building Code Compliance

When specified and installed in accordance with the requirements of the Installation Guide, DriStud FRU 36 roofing underlay will comply with the following provisions of the NZ Building Code:

  • Clause B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, h)
  • Clause B2 Durability: B2.3.1(a), B2.3.2(b) (15 years)
  • Clause C Protection from Fire: C3.4(c)
  • Clause F2 Hazardous Building Materials: F2.3.1
Other Performance Attributes
  • The manufacture of DriStud FRU36 is ISO9001:2008 certified by Q.A. International Certification Limited (No. QAIC/KR/6001-A) issued on 20 January 2015.
  • TCL Hunt is also ISO9001:2008 certified by International Certifications (No. C32413) issued on 5 December 2013.
B1 Structure compliant
B2 Durability compliant
C Protection from Fire compliant
Protection from Fire
F2 Hazardous Building Materials compliant
Hazardous Building Materials
Product Technical Statement
CodeMark Certificate

CM70021 [2019]

Installation Guide

Products include DriStud wall and roof underlays, Window Flashing Tape, Vent NZ passive ventilation system and Proctor construction membranes.

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