The VapR-free product is suitable for both warm and cold pitched roofs without the need for roof space ventilation.

It is a multi-layer laminate film composite, made of polyolefin materials, which results in a pitched roof underlay that has high vapour permeability, which is also highly water resistant.
Suitable for commercial and domestic buildings, it is the ideal roof underlay for both tiled or slated, warm and cold pitched roofs.

There is a great debate in the industry as to whether we need to ventilate cold pitched roofs or not. The BBA issued a questions and answers paper in April 2004 which clearly states that you do not need to ventilate:

Providing the roof system is considered as a whole from ceiling to roof tiles;

Assuming that the roof tile underlay used is breathable;

As long as the underlay has been approved for use in an unventilated cold pitched roof.

VapR-free – Vapour Permeable roof tile underlay has BBA accreditation. To see this document in full please refer to the downloads section below.