Winstone Wallboards Ltd is New Zealand's largest manufacturer and marketer of gypsum plasterboard, drywall systems and associated products. The company has been operating since 1927 and manufactures plasterboard systems under the iconic GIB ® brand name. GIB ® plasterboard is made up of naturally occurring gypsum, 100% recycled paper, and a small quantity of other ingredients. All 13mm GIB ® plasterboard carries Environmental Choice New Zealand certification. Other environmental performance initiatives include promotion of architectural practices to encourage the design of healthy and sustainable buildings. Development of products and services to support better use of existing material reuse and recycling (e.g. Local manufacture in Auckland and Christchurch, GIB ® cut-to-length service to reduce waste and site-waste recycling into compost) and support of NZGBC industry initiatives.