HYDRA Roof Underlay
HYDRA Roof underlay is a premium Tri-laminate, Synthetic, Fire Retardant, Absorbent, Breathable, Self-Supporting Roofing Underlay. Suitable for all roof types including concrete and clay tiles, pressed metal tiles and profiled metal roofing.
Features & Benefits:
- Breathable, self-supporting, synthetic underlay
- Fire retardant, flammability index of ≤5 as per AS1530
- UV Exposure 14 days
- 100% recyclable
- Tri-laminate offers high strength & lightweight
- GripSpot provides a slip resistant walking surface
- HYDRA Breathable Barrier Layer prevents water but allows for transfer of moisture vapour
- HYDRY Technology bottom layer is designed to absorb moisture in the roof space
- Suitable on timber and steel frame
- Suitable with pressed metal & masonry tiles
- Suitable with profiled metal roofing
- Suitable in all Wind Zones stated in NZS 3604 up to and Including, extra high
- Forms part of the Marshall Weatherization System
- BRANZ Appraised # 1071 (2019)
Available in 1250mm x 20m & 1250mm x 40m
Frequently Asked Questions
What is HYDRA Roof Underlay used for?
It's a tri-laminate, synthetic, fire retardant, breathable, self-supporting roofing underlay suitable for concrete and clay tiles, pressed metal tiles, and profiled metal roofing, on both timber and steel frame.
What wind zones is HYDRA Roof Underlay rated for?
It's suitable in all wind zones stated in NZS 3604, up to and including extra high.
Is HYDRA Roof Underlay fire retardant?
Yes, with a flammability index of ≤5 as per AS1530.
How long can HYDRA Roof Underlay be exposed before roofing goes on?
It has a 14-day UV exposure rating, shorter than the wall underlays in the range, so roofing needs to follow reasonably promptly.
Does HYDRA Roof Underlay provide traction during installation?
Yes. HYDRA Roof Underlay includes GripSpot technology, with an embossed upper facer that gives enhanced traction over framing. It is also a self-supporting underlay, so it stays in place across the framing while roofing is installed.
How does HYDRA Roof Underlay manage moisture?
The HYDRA Breathable Barrier Layer stops water getting in while letting moisture vapour escape, and the HYDRY Technology bottom layer absorbs moisture within the roof space.
What sizes does HYDRA Roof Underlay come in?
Hydra Roof Underlay comes in 1250mm x 40m rolls.
Is HYDRA Roof Underlay BRANZ appraised?
Yes, BRANZ Appraisal #1071 (2019), and it forms part of the Marshall Weatherization System.