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BowTie

Retrofit ties for restraining bowed walls through joist ends

BowTie Retrofit Helical Tie

BowTie is a long stainless steel retrofit helical tie used for stabilizing bowing / bulging walls, without any external plates, by securing and anchoring them to internal floor and ceiling joists.

Standard BowTies are recommended when installing into joist ends.

The BowTie range can be used as a wall-diaphragm anchorage in seismic upgrades. Download the Design Guide for more information.

Components

Drill bit for clearance hole
BowTies
Power support tool
Hand support tool

Used to stabilize bulging walls by securing and anchoring them to internal floor and ceiling joists
Standard BowTies are recommended when installing into joist ends
BowTie HDs are recommended when installing into parallel joist sides
Mechanically connects floor joists or roof beams
Provides stiffness without the need to install noggins or additional bracing

BowTie

1. Mark the positions of the joists on the external wall.
2.Drill clearance holes (normally ½”), through the masonry only, in line with the centre of the joists.
3. Clean out the hole to clear any dust or debris.
4. Fit the power support tool into an SDS rotary hammer drill and insert the BowTie.
5. Drive the BowTie (off hammer) into the joist to the required depth (3″ minimum).
6. Fit the sleeve over the tie and push it to the back of the hole in the masonry (use the support tool)
7. Inject Helifix HeliBond grout into the hole to fill it completely.
8. Make good all holes at the surface with brick dust or matching mortar or leave ready for any decoration.

1. Mark the position of the joist centre on the external wall and then drill a clearance hole (normally ½”) through the wall (and first joist if parallel to the wall). Clean out the hole.

2. Fit the BowTie Support Tool to an SDS rotary hammer drill, insert the BowTie and drive it into joist end to the required depth – at least 3″ (or through the second joist if parallel).

3. Fit the plastic sleeve over the BowTie and use the support tool to push it to the back of the hole in the masonry (in the outer wythe in a cavity wall).