Glulam timber beam
Donaldson Timber Engineering
An open web joist is a composite timber and steel joist forming an open web design, which provides the lightness of timber yet with the strength of a steel web. Posi-Joists are ideal for flat and mono-pitched roofs, and help cater for thicker insulation, creating extremely energy-efficient buildings with low U-values.
Posi-Joists are lightweight, strong, easy to install and available in long lengths. The open web design means that using these joists can eliminate costly cutting and drilling when installing services, allowing you to incorporate modern ventilation and heat recycling systems which can help to achieve higher CSH levels. These joists also provide a very flexible design solution for building contractors - including for future modifications.