Tyvek supro is certified by the bba as a low water vapour resistance type lr underlay. Product description dupont tyvek supro is a durable water resistant membrane that is reinforced with a laminated polypropylene nonwoven. Dupont tyvek supro roof underlay an underlay is a key component of the roofing structure and provides an important element in the weather tightness of a roof cladding system.
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