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 1.2 m between adjacent supports.