Tie Selection
The Helifix range of high performance masonry remedial wall ties and pinning ties includes the DryFix ResiTie, RetroTie, CemTie and BowTie systems.
Typically, the composition of the wall requiring repair, and the size of the cavity involved, will dictate which particular Helifix product will be required to provide a strong and durable solution.
Commonly, the DryFix system will provide the most suitable solution to the problems of wall instability and tie failure. On some occasions, however, such as where the problem involves a wall buit with a very large cavity or from a combination of very different building materials, a ResiTie or RetroTie wall tie solution may be required. Problems involving rubble-filled or deep masonry walls will typically require a CemTie solution, while problems involving the reconnection of bowed or bulging walls to floor joists will regularly require a BowTie solution.
The tables listed below provide further guidelines on how to choose and install these different wall tie and pinning solutions.
Table 1 lists the most appropriate remedial wall tie systems for situations involving standard cavity wall constructions with differing cavity widths.
Table 2 matches different wall tie and pinning systems to a selection of different wall constructions and remedial situations.
Table 3 outlines tie size specifications.
Table 4 details tie penetration and pilot hole requirements for different substrates.
Note. These tables provide a guide only and in some situations, a full site survey conducted by an engineer or building professional may be required to produce an accurate specification. Please contact the Helifix National Sales Office for assistance.
| TABLE 1 – Tie systems for standard cavity and brick veneer walls | ||||
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| Cavity Width | DryFix | RetroTie | ResiTie (8mm) | ResiTie (10mm) |
| <40mm |
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| 40mm-60mm (standard) |
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| <90mm |
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| 90-140mm |
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| 140-200mm |
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| >200mm |
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| Note: | Table 1 information is to be used as a guide only. Detailed specifications should be obtained from a suitably qualified professional. For assistance please consult the Helifix National Sales Office. | |||
| TABLE 2 – Tie systems for other common wall types and remedial situations | |||||
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| Toggle table content | |||||
| DryFix | RetroTie | ResiTie (8/10mm) | CemTie | BowTie | |
| Solid masonry |
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| Brick/Cavity/Concrete |
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| Brick/Cavity/Concrete Block |
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| Brick/Cavity/Block |
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| Rubble-filled, parapet and party walls |
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| Bowed Brickwork/Timber |
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| Note: | Table 2 information is to be used as a guide only. Detailed specifications should be obtained from a suitably qualified professional. For assistance please consult the Helifix National Sales Office. | ||||
| TABLE 3 – Tie size | |||
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| Toggle table content | |||
| Diameter | Length | Clearance Hole | |
| BowTie | 8mm | Parallel joists: Sufficient to drive 50mm into or through the second joist | 12mm |
| Perpendicular joists: Sufficient to drive 75mm into joist end grain | 14mm | ||
| CemTie | 8mm & 10mm | 50mm less than all the materials being tied |
8mm tie: 12-14mm (length up to 450mm) 16mm (length over 450mm) |
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10mm tie: 16mm (length up to 450mm) 18mm (length over 450mm) |
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| RetroTie | 8mm | Minimum 3/4 of near leaf thickness + cavity width + far leaf penetration* | In near leaf only* |
| DryFix | 8mm | Near leaf thickness less 10mm + cavity width + far leaf penetration* |
Not applicable – Pilot Hole required |
| ResiTie | 8mm & 10mm | Minimum 3/4 of near leaf thickness + cavity width + 55mm far leaf penetration |
10-12mm (for 8mm tie up to 450mm) 12-14mm (for 10mm tie up to 450mm) |
| Notes: | *Refer to Table 4. Standard tie lengths include: 155, 170, 180 195, 205, 220 245, 270 and 295. Longer cut lengths are available to order. The information provided in Table 3 is to be used as a guide only. Detailed specifications should be obtained from a suitably qualified professional. For technical assitance please consult the Helifix National Sales Office. | ||
| TABLE 4 – Tie penetrations for different substrates | |||
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| Toggle table content | |||
| Far Leaf Material | Penetration (mm) | Recommended Tie | Pilot Hole |
| AAC/Soft bricks <4.0 MPa | 95 |
8mm DryFix 8mm RetroTie |
Not required Not required |
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Standard brick/Natural stone Hollow concrete block |
60-70 |
8mm DryFix 8mm RetroTie |
5mm/6mm 5mm/6mm (Perc. drill) |
| Hard brick/Extruded brick | 45 |
8mm DryFix 8mm RetroTie |
6mm/6.5mm 6mm/6.5mm |
| High strength reinforced vibrated concrete | 35 |
8mm DryFix 8mm RetroTie |
6.5mm 6.5mm |
| Timber frame | 45 |
8mm DryFix 8mm RetroTie |
Not required* Not required* |
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Floor joist - end grain Floor joist - sidegrain |
45-70 70 |
8mm BowTie 8mm BowTie |
Not required* Not required* |
| Notes: | *5mm pilot hole optional in h/wood. Table 4 information is to be used as a guide only. Detailed specifications should be obtained from a suitably qualified professional. For technical advice please consult the Helifix National Sales Office. | ||