Roofshield is a tried and tested type of roofing underlay; it is the first choice for many roofing contractors, and there are many reasons why. It is a vapour and air-permeable underlay (VPU) for pitched roofing. Roofshield has remained unchanged in specification for over 25 years, yet is consistently able to meet and exceed the evolving demands of the roofing industry.   

Condensation Control

With a Roofshield on your building, it is virtually impossible for condensation to form. This is due to the exceptional air permeability and ventilation it provides. Condensation control to this degree is a great way to ensure that your building doesn’t suffer from damp, or mould. This goes against the specification of many buildings and other VPUs which are constantly becoming more and more airtight; though this is beneficial in terms of energy performance, condensation and damp can be extremely detrimental to the health of those in the building and its structural integrity. The benefits of Roofshield for condensation control are especially apparent for complex pitched roofing, which Roofshield allows to breathe without the need of secondary venting or air gaps.


Roofshield underlays are breathable roofing felt; it is air and vapour permeable, which means that with a roofshield underlay, you don’t need any extra ventilation for your pitched roofing. Roofshield is accepted by the NHBC for use without ventilation, even for cold-pitched roofing, where the debate on how best to ventilate has been an ongoing one.

It is now an accepted fact that not all roofing underlays are the same; an airtight underlay will not give you ventilation, whereas the air-permeable Roofshield underlay will do.

Water Resistance 

Despite the Roofshield membrane being able to allow air and vapour to travel through, it doesn’t allow water through. It is highly water resistant and hydrophobically treated in order to make sure that water stays out of your building by preventing leaks by adding a secondary barrier to the rain. The strength of Roofshield against extreme weather conditions means that it is used in some of the harshest climates in the world, such as Antarctica and Canada.

BBA & NSAI Certified

There is an increased focus on building regulations and ensuring that quality materials are used for building. Using Roofshield is a good way to work towards this. Roofshield is certified by a number of respected bodies such as BBA, which is the British Board of Agreement, and the certification indicates a high quality and reliable product. Roofshield was also the first ever roofing membrane to be certified for use in non-ventilated cold-pitched roofing.

Roofshield is also NSAI-certified, which is the National Standards Authority of Ireland and the official standards body for Ireland.

No Need for a Vapour Control Layer

A Vapour Control Layer, or VCL, is a layer on the inner part of a building which prevents moisture flow through the walls, flooring or roofing. It is often put in place to reduce condensation, and this is not needed for buildings for Roofshield. Roofshield is the only VPU that the BBA trusts enough to explicitly state that a VCL is not needed for buildings with Roofshield.

Roofshield is a highly trusted name within the roofing industry, and it is a great way to reduce issues related to condensation and lack of ventilation, whilst being highly water resistant. Roofshield is an excellent addition to pitched roofing to keep your building dry and ventilated, even in the most adverse of weather conditions. If you would like to find out more, or get a quote from our expert roofing team, then get in touch with S&J today!