Design Floating Decks Over Waterproofed Flat Roofs

Elevate your outdoor living potential with floating decks that protect your roof and deliver seamless, usable space above.

1

Outdoor Living – Add attractive, usable outdoor areas over flat roofs and podiums.

2

Membrane Protection – Preserve waterproofing integrity beneath the deck.

3

Level Access – Create flush transitions for better usability and compliance.

Why Floating Decks Are Ideal for Usable Roof Space

In urban New Zealand settings where backyard space is limited, membrane decks and rooftop terraces and podiums provide fresh-air retreats, social areas or even private gardens. A floating deck transforms a flat roof from a functional surface into a highly desirable outdoor living area.

These spaces add property value, increase occupant amenity and support urban intensification.

Unlike trafficable membranes, which can degrade under continuous foot traffic, floating decks protect the membrane while enhancing outdoor living. This dual functionality is especially beneficial for apartment buildings and high-value developments looking to maximise the liveable footprint.

Pedestal Options and Materials That Support Long-Term Durability

Modern floating decks are supported by proprietary pedestal systems that sit directly on the membrane without adhering to or penetrating it. These systems distribute weight evenly and allow the deck to be perfectly level, regardless of the fall in the waterproofing layer.

Pedestals can support timber decking or large-format pavers, and their modular design makes them easy to adjust or replace. This not only simplifies installation but also ensures ongoing access for maintenance or inspections - an essential requirement under NZ Building Code clause E2.

Nuragrid for Nurajacks

Innovative grid system suitable for large podium areas, public spaces, rooftop bars and even stylish backyards.

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Nuraply TPO

Single-ply Nuraply TPO membrane provides watertight integrity for low-slope roofs and decks. For architectural smooth clean lines.

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Nuraply 3PM

Durable bitumen membrane for flat roofs and decks. Nuraply 3PM offers double-layer waterproofing with a textured mineral chip finish.

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Nurajacks

Adjustable pedestals for deck construction. Nurajacks provide wind resistance, slope correction and acoustic buffering.

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Key Compliance Details: Balustrades, Load Ratings and Access Requirements

All elevated decks above 1 metre must comply with NZ safety regulations, including secure balustrades, minimum live loads and provisions for drainage.

Correct upstand heights and clearances must be provided at cladding interfaces to prevent water ingress.

Floating decks are a best-practice approach for ensuring Building Code compliance while achieving premium design outcomes. They also help mitigate acoustic impact noise - making them ideal for multi-unit residential areas.

FAQs

What is a floating deck system and how is it installed?

A floating deck system sits above a waterproof membrane on adjustable pedestal supports. It does not penetrate the membrane, preserving waterproofing integrity. Decking or pavers are laid on the pedestals, which can be adjusted to create a level surface. This system is ideal for creating usable space while allowing access to the membrane for inspection and maintenance.

What are the advantages of using pedestal supports for floating decks?

Pedestal supports provide height adjustability, even load distribution and protect the membrane beneath. They simplify installation over sloped roofs and decks and allow easy access for future membrane inspection. Their modular nature makes them ideal for retrofits and commercial rooftops where drainage and upstand clearance are critical.

How do I maintain waterproofing when adding a floating deck?

To maintain waterproofing, the deck should not fix into the membrane. Use non-penetrating pedestals, ensure proper upstand heights and allow for drainage access. Periodic inspection of the membrane and outlets is necessary, and the deck system should allow easy removal of individual pavers or boards for maintenance.

How do I ensure proper drainage beneath a floating deck?

Ensure the roof membrane is laid with appropriate fall toward drains. Ensure pedestals are used to support decking and pavers so water flow is not impeded. Incorporate inspection openings and design for clear water paths around upstands and across the membrane to outlets. Use geotextile filters if gravel is used in surrounding build-ups.

Is a floating deck suitable for homes in high-wind zones?

Yes, but additional anchoring or heavier paver options may be required. Wind uplift should be assessed and the deck designed to remain secure under local wind conditions. Special fixing options or supporting grids may be used to further restrain the pavers.

Related Webinars

Part 2 of our Nuragrid series as we take a deeper dive into compliant podium systems. This session will cover key considerations for public spaces - including wind uplift, stone adhesion, integrated services, and landscaping elements.

The Smarter Way to Support Pavers with Nuragrid Part 2

Discussing a deeper dive into compliant podium systems with technical drawings and Revit files.

Presented by Shane Clarke, Scott Squire (Nuralite) & Sam Meares (Nurajack).

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Discover how the Nuragrid system provides a smarter solution for raised decking - offering superior safety, versatility, durability and ease of installation.

The Smarter Way to Support Pavers with Nuragrid

Discussing how the Nuragrid system provides a smarter solution for raised decking.

Presented by Shane Clarke (Nuralite), Lewis Olding (Nurajack) and Rob Hill (Picnicka).

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