Existing wall ties are located using a metal detector to find their pattern and density, inspection holes are then drilled to view a sample of the ties using a high intensity boroscope. Where necessary sample ties may be removed for more detailed analysis. All sample holes / disturbed mortar joints being made good during the survey.
If the survey results indicate corroded or insufficient ties the report will recommend a suitable replacement strategy.
Description of Replacement
The stainless steel ties used are reliable Double Mechanical Precision Pre-Torqued Tie that sets new standards in replacement wall ties. Its unique special coated black stainless steel precision limited torque nut combined with the precision modified stainless steel bar provides a fixing system which permits:
- Rapid continuous fixing to both inner and outer leafs
- Ensures inner leaf fixes to pre-torqued level before outer leaf engages
- Pre-torqued setting reliably produces pull out figures of over 2.5 kilo newtons
- Independent pull testing of the inner leaf AFTER fixing into the wall allows any or every tie to be pull tested on the inner leaf after initial fixing if required.