All of Viking Roofspec's CertainTeed asphalt shingles range (20 year warranty through to 50 year warranty) can now be regarded as a lightweight roofing system when used in conjunction with the Viking SuperStrand Sarking substrate.
This is achieved through the performance and structural integrity of the wide-spanning 16.3mm thick Strand Sarking, which even when installed with the thickest shingles, performs equal to a lightweight roof.
Item 7.3 of the Strandsarking BRANZ Appraisal 891 states:
"Roof systems incorporating Strand Sarking weighing up to 25kg/m² may be considered as a Light Roof for design in accordance with NZS 3604."
SuperStrand Sarking is a strand board specifically designed as a substrate for asphalt shingles in New Zealand, and it offers a number of advantages. It is H3.1 treated, exceeding the minimum requirement. It does not require a tongue and groove edge, making it faster to install, and with a 3.6m long sheet, it provides a more pristine finish.