Guaranteed Council
acceptance of
NZ's lowest flat
roof slopes.
New Zealand's
most specified
torch-on membrane
roof system.
designers for
over 40 years.
Contact our
dedicated team
of waterproofing
Proudly Kiwi
owned and
Tried and tested

Nuralite's CodeMark certification can take projects
to new levels.

With this certification, specifiers can now have confidence that the double-layer Nuraply 3PM, Nuraply 3PT/3PTM and Nuraply 3PG waterproofing system will readily gain Building Consent on substrates with falls as low as 1 degree.

What is CodeMark?

Previously torch-on membranes have been treated as 'alternative solutions' to demonstrate compliance with the Building Code. Often this has been a sticking point as Councils enforced different standards.


CodeMark certification is administered by the Ministry of Business Innovation and Employment (MBIE) and is the pinnacle certification for building products in New Zealand. By law, Councils must accept a CodeMark certified product provided it is designed and used within the scope of the CodeMark certificate.

Key Specification Points

Within the scope of our CodeMark certificate you may:

  • Have 1:40 (1.5 degree) falls on plywood substrates, supported by nogs and rafters at 600mm centres with 17mm ply for roofs, and 21mm ply for decks. This is a lower slope than E2/AS1 and saves money on framing timber and labour.
  • Have 1:60 (1 degree) falls on a concrete substrate - a slope that is half the E2/AS1 roof slope. The slope may be formed with a screed or using Enertherm tapered PIR boards for a quick and lightweight system.

View the CodeMark Certificate and Installation Manual for a full listing of uses and limitations. 

Lower Build Costs

Nuraply 3PM CodeMark can lower the cost of Flat Roofing in many ways:

  • It can allow a 50% saving on timber framing and labour costs, as on a plywood substrate framing is a 600mm centres compared to the standard of 400mm centres.
  • CodeMark speeds up build time. Instead of using concrete screeds and waiting for cure time, the slope may be formed using Enertherm tapered PIR boards for a quick and lightweight system.
  • The Nuratherm warm roof system on a metal tray will save costs. NPM900 is a significantly cheaper substrate than plywood. Combined with Enertherm insulation, a system is created that is more cost- effective and energy efficient than ever before.
  • No need to repitch tired old roofs. Subject to Nuralite review, we may approve slopes to 1:80 if it can be established that these falls will be achieved following installation of the new membrane.
Nuralite's double-layer Nuraply 3PM, brings all the benefits of a bulletproof waterproofing system, with slopes as low as 1:60 (1 degree). And all of this security and slope design flexibility comes for a similar budget to lightweight, single layer alternatives.
  Cold Roof Warm Roof (Nuratherm)
Substrate Plywood Concrete Existing Substrates Concrete with Tapered Boards or Flat Enertherm
Plywood with Enertherm
NPM900 or approved metal tray (B) with Enertherm
Minimum Finished (Constructed) Falls
1:80 1:80 1:80 1:80 1:80 1:80
Recommended Design Fall (excluding gutters) (A)
1:40 1:60 1:60 Confirm no ponding areas 1:60 1:40 1:40
Gutters 1:100 1:100 1:100 1:100* 1:100 1:100
Substrate Comments Using 17mm (roofs) or 21mm (decks) plywood, rafters at 600 centers, nogs at 600 centers. Create required slope with a screed. Wait for concrete and screed to cure. Confirm substrate is sound *Minimum fall available using tapered boards is 1:60. Nuralite can assist with tapered board layout.
Create required slope in the plywood Create required slope in the NPM900

A)    For the purpose of this Certificate roofs must have a minimum finished constructed fall of 1:80. To provide for construction tolerances it is recommended (but not required) that for design purposes, a 1:40 fall should be used on plywood and metal substrates or 1:60 for concrete.
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