Bulletproof membrane roofing for over 50 years.
|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|
|Design Fall (excluding gutters) (A)
||1:40||1:60||1:60 Confirm no ponding areas||1:60||1:40||1:40|
|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 1:80. Nuralite to 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 fall of 1:80.
For design purposes, a minimum 1:40 finished fall should be assumed for plywood and metal substrates or 1:60 for concrete.
If lower falls are required Nuralite will issue a Producer Statement following detailed analysis of the roof including its size, location, overall and local deflection, direction of falls, etc.
|B)||Other metal tray systems may be used as a substrate with specific approval by Nuralite which is provided on a case by case basis.|
|Fall ratio||Slope angle||% Slope||Rise in mm over 1m|
|1 : 120||0.5°||0.8%||8|
|1 : 100||0.6°||1.0%||10|
|1 : 80||0.7°||1.3%||13|
|1 : 60||1.0°||1.7%||17|
|1 : 40||1.4°||2.5%||25|
|1 : 38.2||1.5°||2.6%||26|
|1 : 28.6||2.0°||3.5%||35|
|1 : 19.1||3.0°||5.2%||52|
|1 : 14.3||4.0°||7.0%||70|
|1 : 11.4||5.0°||8.7%||87|
In a Nuratherm warm roof situation ventilation is unnecessary as the insulation is designed to encapsulate the entire roof system.
If using a cool roof system then yes cross flow ventilation is required. Ventilation of timber roof spaces, particularly skillion roofs, has always been recommended by Nuralite to assist with removal of interstitial moisture and mitigate high temperatures in the ceiling cavity.
The method for creating cross flow ventilation is a design consideration. A practical and unobtrusive way is using soffit vents. Alternatively we supply a purpose designed Nuravent which is installed on the roof itself. Nuravents
It is a warranty requirement that the roof has a full inspection by an approved applicator every five years. This should provide peace of mind that the system is performing well.
Cleaning, Maintenance and Repair
Location, traffic level, effective drainage, and service use will dictate maintenance requirement.
Once a year the roof should be inspected and, if necessary, swept clean and washed down with a hose and broom, not water blasted.
Particular attention should be paid to areas where ponding water is present. Ponding water causes dirt buildup and can lead to the premature breakdown of coating systems.
As with any coating system, Nuraply 3P with Nuracolour will require recoats during the life of the Nuraply 3P system. Depending on environmental factors and the quality of the roof maintenance programme the coating will need recoating between every 5 and 10 years.
Redressing the NURACOLOUR Gel surface requires cleaning, followed by a new application of NURACOLOUR RECOAT.
Nuraply 3PM membranes have been independently tested to meet NZ standards for potable water collection.
For Nuraply 3PM a glaze coating is recommended which will require replacement during the life of the building.
In accordance with Health Department guidelines, we recommend installing a filter and using a first flush diverter so that only clean water is collected.
Nuraply 3PM has CodeMark certification, the highest certification possible in New Zealand. The CodeMark ensures the systems are consented by Councils if specified in accordance with the Nuralite Install Manuals.
As well, BRANZ has provided an independent verification of the Nuraply 3P(M) and Nuratherm systems, and the Joyce Group has reviewed the Nuradeck system.
All reports have concluded that the respective systems meet or exceed the requirements of the Building Code.
Nuralite roof systems have a long life expectancy. However, at some point it is worthwhile considering tiding it up with a coating system or "rebirthing" it by laying a fresh membrane system over the existing one.
We also strongly recommend considering insulation at this point. Nuratherm can be installed over the existing membrane to bring the entire roof system up to modern standards.
The document "Nuralite Sheet Membrane & Nuraply 80 - Care, Maintenance & Rebirthing" (PDF 589KB) tells you everything you need to know. Contact Nuralite if you would like a representative to come and discuss your options.