HYDRA Roof Underlay
- Appraisal number 1071
- Valid from
HYDRA Roof Underlay is a heavy duty, spun bonded, self supporting, fire retardant, non woven fabric laminated with a breathable coating for use under roof claddings. Marshall HYDRA Roof Underlay is coloured blue and printed with HYDRA logo on the top face and light blue on the bottom face.
HYDRA Roof Underlay has been appraised for use as a roof underlay on buildings within the following scope:
- the scope limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
- with masonry tile roof cladding; or,
- with metal tile and profiled metal roof cladding; and,
- situated in NZS 3604 Wind Zones up to, and including 'Extra High'.
HYDRA Roof Underlay has also been appraised for use on buildings subject to specific weathertightness design. Building designers are responsible for the building design and for the incorporation of HYDRA Roof Underlay into their design in accordance with the declared properties and the instructions of Marshall Innovations Limited.