Render Pinning
Special short tie for securing separated and unstable render
Render Pinning Installation
1. Drill a small pilot hole through the render and into the backup material, to a pre-determined depth, using a rotary percussion drill (3-jawchuck type).
2. Load the pin into the special insertion tool fitted to an electric hammer drill (SDS type)
3. The tie is power driven into position until the outer end of the tie is automatically recessed below the face of the masonry by the insertion tool.
4. The entry hole is finished over with matching materials or sealed as required.
Applications
- Special short versions of DryFix are available for re-pinning separated, unstable and potentially dangerous loose render.
- This situation is particularly prevalent throughout SE Asia where buildings are often coated with a hard render, keyed to the back-up material by means of a splatter dash application, which is then painted or covered with small tiles to achieve a waterproof finish.
- Typically the render is 20-65mm thick but this can vary greatly between 12mm and 80mm. Breakdown of the bond between the render and back-up material can occur for various reasons but once delaminated it is likely to become increasingly unstable, resulting in cracks and bulges. These in turn increase water penetration while wind loads tend to loosen the render even further. Mosaic tile finishes can easily become loose and fall away.
- Installed in the same way as standard DryFix ties, re-pinning is a far simpler and more cost-effective method of stabilising the render than traditional solutions such as hacking off and re-rendering or chemical anchoring with large pins. (See 1988 report by Frank Jones).
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