Brick wall ties are used in buildings with cavity walls. They are mainly used to connect the two leaves of a cavity wall together, enabling the two parts to act as a single unit. It is not visible after the completion of a structure. The partition strap plays an essential role in strengthening the stability of a building.
Partition strap has a similar role as Rosin core solder which is used to join two pieces of metals or wires. Poorly installed straps on walls lead to severe structural issues that include crumbling of outer masonry leaf, masonry cracks, or moisture penetration. They are manufactured from corrosion and fire-resistant materials and include drip formation to avoid passage of water to the inner leaf.
It performs five primary functions:
- Transfer lateral loads
- Offers a connection
- Allows the in-plane movement to lodge differential movements or in some cases restrict differential movements
- Provides horizontal structural reinforcement
- Delivers longitudinal continuity
The standard installation procedure is initiated into the leaves during construction. The confirming straps have efficiently tied leaves, it should be pressed down, bordered by fresh mortar and never be propelled into a pre-built joint. They are installed with a minute fall in the outer leaf rather than an inner leaf as it could offer a path for moisture to cross the cavity. The leaking system should be pointed downward and installed near the centre of an open cavity.
Cavity wall straps are selected on various factors. The standard spacing of straps should be 900 mm horizontally and 450 mm vertically. If additional ties are required, they are installed within the 225 mm of the jambs of any openings.
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