Viking developed WarmSpan2 to answer the NZBC’s H1 (5th edition) requirements for doubling insulation values and rising costs of construction. This engineer-tested system, exclusive to Viking Roofspec, saves cost on overall material and labour while providing an R-value of R6.7 within the lowest possible height build-up for an H1- compliant warm roof.
WarmSpan2 is a complete roof assembly with prescribed joist spacings and substrate-types included in its specification. Listed from the bottom-up, these are the system’s fundamental components:
Structural Supports (max. 900mm centres for ply substrate; 1800mm centres for steel tray)
17mm T & G Plywood (H1.2 minimum treatment) or Steel tray substrate (ST7, ST900, or Metcom 7)
Self-adhered Vapour Barrier (Self-sealing SBS bitumen)
PIR – Rigid insulation panels (foil-faced PIR board)
Viking Insulated Plugs and Fasteners
Coverboard
One of Viking’s CodeMark Membrane Systems (Enviroclad or Viking Torch-On)