Roofing & Cladding Feature
Maintenance & Refurbishment
Protect Fulmetal RediRoll ridge ventilator designed for mono ridge applications
One size does not fit all
John Mellor of Glidevale Protect explains why specification matters in roofing membrane and ventilation products.
performance credentials. Required in virtually all tile and slate pitched roof construction, an underlay
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should be designed as a true hidden protector, operating as the secondary line of defence to the roof tiles, offering weather defence against wind driven rain or snow, and wind uplift resistance to the loading pressures applied to the structure in accordance with BS 5534. However, with the roofing underlay often specified in isolation, the integral link between the type of membrane specified and the controlled ventilation strategy that needs to be employed to manage condensation risk is often forgotten. Roofing underlays and ventilation must work simultaneously to deliver a
full solution that provides a watertight structure and avoids condensation build-up within the roofspace, ultimately leading to a healthy indoor living environment. The choice of underlay for any pitched roof impacts the amount of ventilation required to eliminate harmful condensation, so selecting a manufacturer well versed in offering the appropriate guidance along with an array of solutions is paramount. Choice is the all-important factor here rather than a ‘one size fits all’
pecifying pitched roofing underlays for new build or refurbishment projects is often a confusing subject with so many options available on the market, each offering a variety of technical attributes and
approach, with the membrane an integral component as part of the overall solution. Even if there are cost restraints for the overall roof package, using the cheapest membrane without factoring in additional ventilation requirements may result in problems and expensive structural repairs. Getting it right first time means homes can be future-proofed, maintaining their property values and ensuring reduced maintenance costs.
VENTILATION AND STANDARDS The need to ventilate within housing has never been more important. With the onset of climate change and the ongoing commitment by the UK Government to bring all greenhouse gas emissions to Net Zero by 2050, energy efficiency is top of the agenda with Building Regulations set to become more onerous by lowering U-value notional targets. As well as updates to Building Regulations Approved Document Part L
(conservation of fuel and power) and Part F (ventilation), as recently announced by the Government after the initial consultation process, changes are also expected in 2021 to BS 5250, the code of practice for control of condensation in buildings. Uplift improvements to these regulations in 2021 form the transition to the Future Homes Standard, set to vastly improve energy efficiency in new build properties, which will be introduced by 2025. Additionally, the recent new
www.housingmmonline.co.uk | HMM February/March 2021 | 33
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