Drive Fix Remedial Helical Wall Tie Kit
Our Drive Fix Remedial Helical Wall Tie Kit contains the following products suitable for wall areas of between 200 – 230m2 allowing for doubling up density around window and door reveals. Tie density is normally calculated at 2.5 ties per m²:
- 100 x Drive Fix Ties 8mm x 195mm or 220mm
- 1 x SDS Adaptor Tool
- 2 x SDS Plus Carbide Tipped Drill Bits. 1 x 6mm x 160mm and a choice of either a 6mm x 310mm or 6mm x 450mm.
Drive Fix Remedial Wall Tie Kit offers the following options:
A quantity of 100 Drive Fix Remedial Helical Wall Ties in 8mm diameter by 195mm or 220mm long.
The installation process requires that a 6mm diameter pilot hole is drilled first into the brick to accept the Drive Tie which is hammered into the brick using the SDS Adaptor Tool provided with the kit.
Note: The diameter of the pilot hole is between 5.5mm – 6.5mm for 8mm Drive Ties but which is also determined by the nature of the host material.
Our Kit includes as standard a 6mm x 160mm SDS Plus drill bit with the optional choice of either a 6mm x 310mm or a 6mm x 450mm SDS Plus drill bit if you need to achieve an embedment depth of over 50mm for a 220mm long tie.
We recommend the shorter 6mm x 160mm drill bit is used to reduce ‘whip’ when using the longer drill bit.
This kit is great value for builders, damp proofers and wall tie contractors working on smaller jobs to an area of between 20 – 40m².
Drive Fix Helical Remedial Wall Ties are ideal for walls with a render finish.
If the wall is rendered, pebble dashed or coated with anything, this will reflect on the method of installing the wall ties and the type of remedial tie. For starters, is the material sound? Drilling causes vibration and may shake loose or crack old render. Could there be services or pipes under the coating, a metal detector should help here. The use of a remedial cavity wall tie designed for mechanical expansion should be avoided, because without extreme care and many aborted holes, some of these will inevitably be drilled near the edge of a bed joint, where post-torsion expansion can ruin the fix, see below), leaving the wall tie useless and a waste of time and money. Mechanical expansion ties work by exerting expansive force outward, through the brick or stone; rather like a rawlbolt. If the material cannot take these stresses, the material fails and the fix is compromised. Thus most manufactures of these wall ties recommend the wall ties are fixed ‘centre of brick’ to ‘centre of brick’, which is hard when the brick is hidden behind render (not to mention the inner leaf which is always hidden).
So if render is present, non-expansive type wall ties should be selected such as; resin bonded wall ties in both skins; Helifix ResiTie, or combined resin/friction fix, such as the Helifix RetroTie (friction fix inner leaf, which can be tested independently of the outer), followed by resin fix in the outer leaf.