The following sites could be useful in informing you how to use Viblock products:
Cement and Concrete Association of New Zealand: www.cca.org.nz
New Zealand Concrete Masonry Association Inc: www.nzcma.org.nz
New Zealand Masonry Trades Registration Board (Inc.): www.mtrb.org.nz
New Zealand Master Masonry Trades Federation Incorporated: www.mmtf.org.nz