These products act to secure two leaves of a cavity wall to each other allowing them to act as one structurally. They incorporate some mechanism in their design to prevent the passage of moisture across the tie.
Cavity ties are tested to BS EN 845-1 and rated according to their strength allowing the correct ties to be selected for the situation they are being used in. Ties with PART E Type A approval are tested for resistance to the passage of sound and suitable for use in party walls.
Ties are manufactured from grade 304 stainless steel for good long term resistance to corrosion.