SNZ - NZS/BS 1521
Specification for Waterproof building papers
|Publication Date:||1 January 1972|
This British Standard specifies the quality, workmanship, dimensions and performance requirements for two classes of waterproof building papers. Each class is divided into two grades and each grade into two type as follows:
1) Class A. For building purpose, such as for the prevention of draughts or the ingress of water damp-proof courses such as are normally required by building byelaws.
Class A papers are of two grades. They are:
a) Grade A1, having higher tensile strength and bursting strength test requirements.
b) Grade A2, having lower tensile strength and bursting strength test requirements.
2) Class B. For temporary purpose, such as for the protection of concrete during curing or as an underlay to concrete to prevent moisture being absorbed by the base.
Class B papers are of two grades. They are:
a) Grade B1, having a higher bursting strength test requirements.
b) Grade B2, having a lower bursting strength test requirement.
NOTE The titles of the British Standards referred to in this standard are listed on the inside back cover.