Water Vapour Control Layers

Water Vapour Control Layers - EN 13970 & EN 13984

Systems of assessment and verification of constancy of performance (AVCP) are determined according to the table below given in EN 13970 and EN 13984 standards.

Product	Intended Uses	Level or Classes	AVCP system(s)
Water vapour control layers	Water vapour control layers subject to reaction to fire regulations	(A1, A2, B, C)*	1
		(A1, A2, B, C)**, D, E	3
		F	4
	Water vapour control layers	-	3
* Products/materials for which a clearly identifiable stage in the production process results in an improvement of the reaction to fire classification (e.g. an addition of fire retardants or a limiting of organic materials) ** Products/materials not covered by footnote (*) NOTE Because all products require initial type testing of water vapour permeability, the only systems which apply are 1 or 3. The inclusion of system 4 here indicates that no testing is required for reaction to fire Class F.

In general, the systems of assessment and verification of constancy of performance (AVCP) of waterproofing sheets to be used as a vapour control layer is defined as system 3. On the other hand; Only fire-related properties of vapour control layers with reaction to fire class F are evaluated within system 4. For products with reaction to fire class A1-E, reaction to fire under the influence of external fire and reaction to fire tests must be carried out by notified laboratories, while no fire test is required for class F products. Accordingly, the duties of the producers within the scope of system 3 are determined with the table given below in the EN 13970 and EN 13984 standards covering the relevant product groups.

Tasks		Content of the task
Tasks under the responsibility of the manufacturer	Factory product control (FPC)	Parameters related to all relevant characteristics of ZA.1.
	Initial type testing by the manufacturer	All relevant characteristics of Table ZA.1 except reaction to fire, watertightness and water vapour permeability
	Initial type testing by a notified test laboratory	Reaction to fire (A1, A2, B, C)**, D, E , watertightness and water vapour permeability

Tests Required to be Performed by Notified Laboratories: For these products included in System 3, the control activities of the notified test laboratory, under the responsibility of the producer, are limited to watertightness, water vapor permeability and reaction to fire. From this point of view, the tests that must be performed by the notified laboratory are limited to the following features. The manufacturer is responsible for the application of other tests given in the ZA.1 table. Standards and test methods for the release of dangerous substances are not yet available.