|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.|