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DriStud RU24 — Synthetic Self Support Roof Underlay

DriStud RU24 is non-fire retardant self-supporting black faced synthetic roofing underlay.

It is a tri-laminate consisting of engineered synthetic materials and it is water resistant and vapour permeable. DriStud RU24 must not be installed where fire retardant roof underlay is specified.

Key Features
  • CodeMark certified
  • Self supporting
  • Can be installed over timber and steel roof framing
  • Breathable
  • Absorbent
  • Durability: 50 years
  • Can be direct fixed behind all claddings
  • Fire Retardant Index: 9
  • Easier and quicker to install with 150mm laplines
Scope of Use
  • Intended for use on new and existing buildings in wind zones up to and including ‘Extra High’, as defined in NZS 3604:2011.
  • DriStud RU24 is designed to be used as a replacement for self-supporting kraft paper roof underlay. It can be installed over both timber and steel framing to ensure a dry roof cavity. 
  • DriStud roofing underlays must be installed with all writing and imagery facing out and with as minimal a number of overlaps as possible.
  • Where overlaps are unavoidable a lap of 150 mm minimum must be used.
  • DriStud RU24 must not span more than 1.2 m between adjacent supports.
  • DriStud roofing underlays must be installed as described in paragraph 8.1.5, E2/AS1.
Limitations on Use
  •  DriStud RU24 must not be installed where Fire Retardant roof underlay is specified. 

Statement of Building Code Compliance

If designed, installed and maintained in accordance with the conditions of the CodeMark Certificate, DriStud RU 24 roofing underlay will comply with the following clauses of the New Zealand Building Code: 

  • B1 Structure: B1.3.1, B1.3.2. With respect to B1.3.3, (a), (h).
  • B2 Durability: B2.3.1 (a), B2.3.2 (b).
  • F2 Hazardous Building Materials: F2.3.1

Will contribute to compliance with;

  • E2 External Moisture: E2.3.1, E2.3.2, E2.3.7 (a), (b), (c).
Other Performance Attributes
  • The manufacture of DriStud RU24 is ISO9001:2008 certified by Q.A. International Certification Limited (No. QAIC/KR/6001-A) on 20 January 2015.
  • TCL Hunt is also ISO9001:2008 certified by International Certifications (No. C32413) on 5 December 2013.
B1 Structure compliant
B2 Durability compliant
E2 External Moisture compliant
External Moisture
F2 Hazardous Building Materials compliant
Hazardous Building Materials
Product Technical Statement
CodeMark Certificate DriStud RU22, RU24, FRU36 & FRU38 Roof Underlays

Version 1. 13 Nov 2023

Installation and Operation

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

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