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DriStud RU22 Roof Underlay
Description

DriStud RU22 is a 145 gsm, grey faced, self-support, synthetic roof underlay. It is micro porous, water resistant film that is laminated to two layers of non-woven spunbonded polyolefin. DriStud RU22 is non-fire retardant. DriStud RU22 can be used to line roofs, walls and ceilings.

DriStud RU22 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 RU22 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 RU22 can be used under masonry tiles, metal tiles and profiled metal roof claddings. However, DriStud RU22 must not span more than 1.2m between adjacent supports.

Key Features
  • CodeMark™ Certified
  • Self-supporting
  • Can be installed over timber and steel roof framing
  • Breathable & Absorbent
  • UV exposure: 7 days
  • Direct fix with absorbent and non-absorbent cladding including metal
  • Low cost synthetic underlay with FR Index of 9 (Non Fire Retardant)
  • DriStud RU22 can be used to line roof, wall and ceiling
Scope of Use
  • DriStud RU22 can be used to line roofs, walls and ceilings
  • DriStud RU22 may be installed over timber and steel roof framing.
  • DriStud RU22 can be used under masonry tiles, terracotta tiles, metal tiles, profiles metal claddings, slate, and composite panels.
  • DriStud RU22 can span up to 1200mm between adjacent supports. Where the span exceeds 1200mm a corrosion resistant mesh or alternative i.e. plastic strapping must be used
Limitations on Use
  • Must be installed in accordance with the DriStud RU22 Installation Guide
Statement of Building Code Compliance

If designed, installed, and maintained in accordance with all TCL Hunt Requirements, DriStud RU22 will comply with the following performance criteria of the NZ Building Code:

  • B1.3.1, B1.3.2, B1.3.3 (a), (h)
  • B2.3.1 (a), B2.3.2 (b) — F2.3.1
  • And will contribute to compliance for:
  • E2.3.1
  • E2.3.2
  • E2.3.7 (a), (b), (c)
CodeMark
CodeMark
Documents
CodeMark Certificate DriStud RU22, RU24, FRU36 & FRU38 Roof Underlays

CMNZ70021 (Version 1. 13 Nov 2023)

Additional Information

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

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