Breathable membrane A product brochure is available from Kingspan for its new Nilvent non-microporous breathable membrane for unventilated pitches roofs. The brochure provides advice for specifiers, contractors, stockists and users on typical design details and considerations, sitework and product data. According to Kingspan, the Nilvent is more breathable than conventional micro-porous underlays and easy to clean and install. It has …