Klober Permo Forte Vapour Permeable Membrane 1.5m x any length in metres.
One of the very premier products on the market.
Extremely thick and heavy duty but Breathable. If you live in an exposed area or just want the thickest Membrane then this is the one.
The Rolls Royce of breather Membranes
Permo® forte is an extremely strong 4-layer vapour permeable underlay with a built-in safety grid. It is suitable for all pitched roofs.Allows the roof structure to breathe, weathertight.