Onduline Appoints New National Specification Manager

21 July 2026

John Alderman headshot

Onduline Building Products has strengthened its commercial team with the appointment of John Alderman as National Specification Manager.

John brings more than 30 years of construction and roofing industry experience to the business, having previously held roofing sales and specification roles with organisations including Marley, SIG Roofing and Surespan.

Working closely with architects, consulting engineers and roofing contractors, John has overseen projects from initial specification through to completion, giving him a strong understanding of the technical and commercial requirements needed to successfully deliver roofing solutions.

New National Specification Manager

Having worked with Onduline products throughout his career, John was already familiar with the manufacturer’s portfolio, particularly its ISOLINE LOW LINE sub-roof system for low-pitch roofing applications.

In his new role, John will focus on expanding Onduline’s specification pipeline by strengthening relationships with architects, specifiers, roofing contractors and tile manufacturers. Working closely with the wider team, he will help convert more specifications into completed projects while supporting the continued market growth of ISOLINE LOW LINE and Onduline’s heritage refurbishment portfolio.

John Alderman said: “I’ve known Onduline and its products for many years, so when the opportunity came up to join the business it was one I was excited to pursue. The company has built an outstanding reputation, particularly in the low-pitch roofing market, and I’m looking forward to working with the team to grow our specification activity, develop new relationships and help deliver more projects across the UK.”

Paul Duffy, Managing Director at Onduline Building Products, added: “John’s extensive experience across specification, sales and project delivery makes him a fantastic addition to the team. He has an excellent understanding of the specification process and the relationships needed to turn opportunities into successful projects.

“As we continue to invest in growing our specification business, expanding our heritage portfolio and increasing the reach of ISOLINE LOW LINE, John’s knowledge and expertise will play an important role in achieving those ambitions.”

>> Read more about Onduline in the news

Share article

Check out the latest issue

125 July-August 2026

Sign Up to
Roofing Today

Stay up to date with all of the latest news from Roofing Today by signing up to our weekly Bulletins…