This CPD gives an overview of pitched roof design considerations and regulations in the UK and Ireland, along with discussing the type of construction membranes used as pitched roof underlays and the effect their performance has on design. It also discusses the implications of hygrothermal focused roof design on the overall building energy performance. By the end of the CPD you should have a greater understanding of:
- Roof types outlined in BS5250:2021 Code of Practice
- Different roof types and associated hygrothermal strategies
- Pitched roof underlay types
- The effects of membrane properties on design requirements
- Factors affecting pitched roof moisture control
Our team of construction professionals are available to deliver our range of educational CPD Seminars in person or via an online meeting, at a time and date that fits your schedule. There is a live Q&A session after the presentation.
Proctor Air® is the result of this quarter century of experience on sites and on drawing boards, listening and responding to the challenges faced by the industry.
The next evolution of roofing underlay technology; Proctor Air has been developed and manufactured to our precise specifications and requirements. This ensures the on-site performance of our material mirrors the off-site performance, while a 15 year warranty ensures peace of mind for any project, now and in the future.
Hydrophobic additive in all three layers of this next generation product amplifies water holdout, and this, alongside an air permeability of 35 m³/m².hr.50Pa and an Sd-value of 0.02m means Proctor Air delivers robust and dependable performance.
Proctor Air has a Hydrostatic Head of water of over 1m as recommended by NFRC Technical Bulletin 6. It is good practice not to leave the underlay exposed longer than necessary. Under BS 5534, Proctor Air can be used in Wind Zones 1-4 at maximum 345mm battens centres without additional tape. At the same time, it reduces the risk of issues occurring in roof spaces due to poorly installed VCLs or ventilation, since neither is needed.
This means Proctor Air can be specified on all roof types not just without low- and high-level ventilation, or a vapour control layer, but with confidence.