Thomas Armstrong Ltd, a MiTek truss and Posi-Joist manufacturer based in Cumbria, recently designed and supplied an impressive roof system to one of its timber frame projects utilising Posi-Rafter Cassettes.
Case Study: Posi-Rafter Cassettes

Thomas Armstrong Ltd, a MiTek truss and Posi-Joist manufacturer based in Cumbria, recently designed and supplied an impressive roof system to one of its timber frame projects utilising Posi-Rafter Cassettes.
We are very pleased to announce the launch of a brand new brochure to promote the Posi-Joist and Posi-Rafter metal-web joist system! The brochure has up to date information along
DWB Hull, a licensed MiTek roof truss and Posi-Joist manufacturer, recently supplied specially designed Posi-Rafters to form the roof for a large domestic extension. Bespoke end details were incorporated into the