Durability and treatment
JJI-Joists are untreated and when used in a Service Class 1 or 2 environment, the European Technical Assessment (ETA) certificate advises that the joists can be expected to have a service life in excess of 50 years.
JJI-Joists are also available with preservative treated timber flanges. This allows their use in Use Class 2 conditions in accordance with BS EN335-1, and Hazard Class 2 conditions in accordance with NHBC. This treatment does not affect the structural properties of the JJI-Joist. Please note a minimum order quantity will apply.