Description. The ARC T-Barrier® achieves a zero U-value at the party wall junction by sealing the party wall cavity. This minimises the effect of thermal bypass as well as reducing flanking noise in the cavity. The ARC T-Barrier for Timber Frame provides a 1 hour fire integrity at the party wall junction and meets the Robust Detail's.. AIM Party Wall Fire Closers are semi-rigid Rockwool stone wool laminated to a polythene DPC. They have been designed to provide at least one hour resistance. 01293 582400;. * For cavities in excess of 100mm, please use the AIM Wall Cavity Barrier complete with Polythene DPC to either side of the party wall junction.

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Timber-frame party walls. Timber frame party walls are generally constructed of two independent wall frames positioned together; their function is to provide a protective barrier against the spread of sound and fire from one dwelling into the other. The two party walls are to maintain a 220 mm minimum diameter and must always include a 40 mm.. Party walls and fire barriers: Guide to roofs, walls and lofts. Running through the walls of most newer homes are firewalls and fire barriers. Designed to stop the spread of house fires between homes, firewalls protect you if your neighbour's home sets on fire. Fire barriers on the other hand, are hidden in internal walls and can stop a house.