A vapour barrier or underroof for buildings

(19)

(11)

EP 1 296 002 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	11.02.2004 Bulletin 2004/07

(43)	Date of publication A2:
	26.03.2003 Bulletin 2003/13

(21)	Application number: 02021193.4

(22)	Date of filing: 24.09.2002

(51)	International Patent Classification (IPC)⁷: E04D 12/00

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

24.09.2001 DK 200101380

(71)	Applicant: Icopal A/S
	2730 Herlev (DK)

(72)	Inventor:
	Jensen, Eirik Sandberg 4000 Roskilde (DK)

(74)	Representative: Plougmann & Vingtoft A/S
	Sundkrogsgade 9 P.O. Box 831 2100 Copenhagen O 2100 Copenhagen O (DK)

(54)	A vapour barrier or underroof for buildings

(57) A film or foil of ethylene vinyl alcohol with a thickness of between 5 µm and 50 µm is used as a water vapour barrier or underroof (15) for buildings. At least parts of the opposite side surfaces of the film or foil are exposed to moisture of the ambient atmosphere. It is important that the vapour diffusion resistance of a vapour barrier is as low as possible under humid conditions and as high as possible under dry conditions. A film of ethylene vinyl alcohol has a very wide diffusion resistance range and provides a more durable vapour barrier or underroof as the material has excellent weather ability. Preferably, the film or foil of ethylene vinyl alcohol has a thickness of between 5 µm and 50 µm.

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