Rollforming Services' 40mm Roof Purlins are a direct replacement for timber purlins. They are lightweight, dimensionally stable, accurate and straight. They expand and contract at the same rate as steel roofing products in extreme temperature changes. They can be fitted to both timber and steel trusses with Type 17 Teks. Ideally suited to timber framed homes, steel framed homes, steel framed buildings and carports.