Open State Cavity Barrier

ARC Open State Cavity Barrier consists of a mineral wool core with an intumescent layer pre-fixed, encapsulated in a polythene wrap. It is fixed to the inner substrate using the appropriate fixings outlined in the table below. Do not remove the polythene wrap, or the factory fitted screws inside the wrap. These are integral to the function of the product and should remain for its life span.

» Ensure all necessary components are to hand.

» Fold the fixing brackets in accordance with fixing specifications table A1 on the datasheet

» Fix the fixing brackets to the inner leaf. Use appropriate non-combustible fixings for the substrate, taking note of the spacing information in table A1. Consider the bracket positions to avoid a clash with the screws pre-fixed inside the barrier

» The vertical leg of the brackets should be fixed so that they extend above the cavity barrier

» Push fit the cavity barrier onto the brackets, ensuring the brackets penetrate the barrier centrally through its 82mm depth

» Ensure the rear face of the barrier is tightly fitted against the inner substrate without gaps. The surface of the inner substrate must be true and even

» Individual lengths should be butt jointed tightly together with no gaps. Ensure both the rock mineral wool and intumescent components are butted together tightly

» At the extreme end of a run, or at corners, the end of the cavity barrier must tightly abut the substrate with no gaps