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Tie Selection

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Tie Selection


The following tables provide some general guidelines on how to choose and install an appropriate Helifix wall tie or pinning solution. Note that in some situations, a full site survey conducted by an engineer or building professional may be required to produce an accurate specification.

Table 1 indicates the most appropriate remedial wall tie system 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.

Ties, substrates and cavity width

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.

TABLE 1 – Tie systems for standard cavity walls (e.g. brick cavity and brick veneer)

Cavity Width

DryFix

RetroTie

ResiTie (8mm)

ResiTie (10mm)

<40mm

 

 

 

40mm-60mm (standard)

 

 

 

<90mm

 

 

 

90-140mm

 

 

140-200mm

 

 

 

>200mm

 

 

 

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.

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TABLE 2 – Tie systems for other common wall types and remedial situations

 

DryFix

RetroTie

ResiTie (8/10mm)

CemTie

BowTie

Solid masonry

 

 

Brick/Cavity/Concrete

     

Brick/Cavity/Concrete Block

   

Brick/Cavity/Block

     

Rubble-filled, parapet and party walls

         

Bowed Brickwork/Timber

         

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.

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TABLE 3 – Tie size

 

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)

     

10mm tie:
16mm (length up to 450mm)

18mm (length over 450mm)

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)

*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.

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TABLE 4 – Tie penetrations for different substrates

Far Leaf Material

Penetration (mm)

Recommended Tie

Pilot Hole

AAC/Soft bricks <4.0 MPa

95

8mm DryFix

8mm RetroTie

Not required

Not required

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*

Floor joist - end grain

Floor joist - sidegrain

45-70

70

8mm BowTie

8mm BowTie

Not required*

Not required*

*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.

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