Protected Membrane Roofs Offer Flexibility and Efficiency

Commercial Building owners are increasingly looking to balance building construction costs with long term energy efficient and ecologically friendly design features.

Features such as green roofs and warm roofs, while often specified, are often excluded from final designs during the consent process. This is because architects are specifying traditional roofing membranes that are not designed or suitable for the application they are being used in, and New Zealand has been traditionally slow in taking up new technology and building practises that are common overseas. An example of this is the Protected Membrane Roof (PMR).

When it comes to low sloped roofs there are two basic systems, the membrane can be exposed or it can be protected. Most roofs in New Zealand are exposed membrane roofs, and while in some applications this is perfectly acceptable (or even a better solution), there are many cases where a PMR roof is a far better solution.

A good example of this is the ASB North Wharf building. Jasmax approached Allco Waterproofing to provide a specification, and it quickly became apparent that the client had very high expectations around energy efficiency and durability. After looking at traditional solutions it quickly became apparent that the best solution for the project was a PMR roof with ILD.

Some of the advantages that a PMR roof has over a traditional membrane roof are:

Long term cost savings
Longer time between tear offs
0 Degree pitch roofs (Hydrotech only)
Efficiency during construction
Greater design flexibility
Protection from trades (eg. HVAC)
Protection form wind uplift and UV
The membrane can also be ILD or flood-tested before insulating and ballasting
Can easily transition between stone ballast, pavers and green roof

Allco Waterproofing has a number of PMR solutions to suit every application including the world renown Hydrotech Monolithic Membrane.

View the Hydrotech Monolithic Membranes BBA testing certificate or download a Protected Membrane Roof paper on roof selection.

Hydrotech Monolithic Membrane

Allco Waterproofing Solutions

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Hydrotech Monolithic Membrane 6125 (MM6125) is a thick, tough, flexible, self-healing membrane for use in roofing applications.

1. Hydrotech (MM6125) membrane system has been assessed as a waterproofing membrane solution for use in cold roof and deck assemblies, and Protected membrane roof and deck (PMR) assemblies.

2. The system must always be protected as follows:

a) On PMR assembly: one of the following overlays must be installed over the insulation layer
- Pavers or floating timber deck on pedestals
- Ballast (graded stones)
- Green roof
- Concrete topping slab
b) On a trafficable cold roof/deck assembly: one of the overlays described in 2(a) must be used:
c) On a non-trafficable cold roof/deck assembly or where only maintenance related traffic is expected: the membrane must be protected with a layer of Hydroflex 30 or Casali Olympia.

Pavers or floating timber deck on pedestals
Ballast (graded stones)
Green roof
Concrete topping slab

3. The system will resist the effects of wind uplift likely to occur in practice. The effect of wind on the overlays described in 2(a) falls outside the scope of this certificate.

4. The system may be used on buildings within the following scope:

a) On new buildings or existing buildings in all exposure zones, excluding microclimates, as defined by NZS3604: 2011.
b) On reinforced concrete substrates with any pitch including zero pitch defined as less than 1:100/0.5, gutter fall must be maintained at a minimum of 1:100/0.5

See CodeMark certificate for full information.

If designed, used, installed and maintained in accordance technical literature and manufacturer's instructions Hydrotech Membrane (MM6125) System will comply with or contribute to comply with the following provisions of the NZBC:

Clause B1 STRUCTURE: Performance B1.3.1, B1.3.2, B1.3.3 (b), (c), (f), (g), (h), (m), (n), (q), B1.3.4 (b), (c), (d), (e)
Clause B2 DURABILITY: Performance B2.3.1 (a) where ballast, green roof or concrete topping slab are used and B2.3.1 (b) where not, B2.3.2 (b)
Clause E2 EXTERNAL MOISTURE: Performance E2.3.1, E2.3.2, E2.3.7 (b), (c)
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1

See CodeMark certificate for full information.

CodeMark

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