This renovation in Auckland saw an increase in the home’s footprint from 95m² To 170m². The project involved re-roofing the building to bring together new and existing sections of the home, replacing aged concrete tiles with modern long-run roofing. To protect the roof from the elements, HYDRA Roof Underlay from Marshall Innovations was specified — a new high-strength underlay that offers exceptional weather resistance.

An essential component of the Marshall Weatherization System, The HYDRA Roof Underlay is a breathable self-supporting tri-laminate roof underlay that is fire retardant and can withstand UV exposure up to 14 days. Living up to its name, the HYDRA underlay features an absorbent bottom layer designed to absorb moisture in the roof space and a HYDRA breathable barrier layer that prevents water but allows for the transfer of water vapour. The top layer of HYDRA has GripSpot technology which provides additional traction for those working on the roof, creating a safer work place.

For the homeowners, who aimed to reduce construction waste as much as possible for their build, another advantage was that the HYDRA underlay is 100% recyclable — meaning it will not contribute to waste at end of life.

As HYDRA is a new product, Marshall Innovations made sure to support the design team at Assemble with comprehensive documentation to ease the council consent process. “They sent all the information through to us promptly including a completed spec section as well as supporting manufacturers documentation,” says Tim de Beer, Assemble. “Getting all the information that council are going to ask for straight off the bat saves us a lot of back and forth.”

The Marshalls team also provided additional support for both the design team and installers. “They came and did a presentation in the office where they explained the technical side of how HYDRA works, and someone from Marshalls went to site to do a demo for the builders to ensure they were installing the product correctly,” says Tim. “This shows their quality assurance which is really important to us too.”

The HYDRA Roof Underlay was installed by Relay Roofing who liked the light weight and strength of the underlay as well as the straightforward installation. “The HYDRA underlay feels more sturdy than other underlays,” says Leon Caddy, Relay Roofing. “The quality of the material just felt better, it seemed quite sturdy and it looked a lot more breathable as well. It was the first and only time I’d used HYDRA and I thought it was the best underlay I’d come across.”

Installed in conjunction with Marshall’s wall wrap, the HYDRA Roof Underlay contributed to providing complete weather protection for the newly renovated home — ticking all boxes for the homeowners, design team and roofers.