Remedial Wall Ties
Remedial Wall Ties
Remedial wall ties are installed when the existing ties have become corroded and can no longer carry out their function. Ie. to hold the two skins of the masonry cavity wall together. This is a non-destructive repair. The new helical ties are installed by drilling a pilot hole through the outer skin of brick then using specialist equipment, self tapping them in to hold the two skins of masonry together again. The ties used for wall tie replacement can also be used to pin arches.
Lateral Restraint Bars
Lateral Restraint Bars
Lateral restraint bars are used to stabilise walls that have become unstable by tieing them back to the floor joists and using the floor as a diaphragm.
Lateral restraint bars are installed by drilling through the masonry at joist level then screwing the helical bars into the joists. They are then permanently anchored to the masonry using a resin compound.
Tension Ties
Tension Ties or Masonry Ties
Tension ties or Masonry Ties are used to prevent walls that are separating from separating any further. Holes are drilled through the damaged area in a set pattern and the ties are installed using specialist equipment. The ties are a length of helical bar that is encapsulated in grout in the installation tool. Once installed the grout is pumped in to fill voids and grout the tie in place. These ties are also used to 'hang' masonry arches from masonry beams that have been installed over the arches as part of the arch strengthening works.
Crack Stitching
Crack Stitching
Crack stitching is used for vertical cracking in walls once the cause of the cracking has been determined and actions taken to prevent further movement if deemed necessary. Crack stitches are installed into the bed joints across the cracks. The bed joints are cut out and a helical bar is grouted in place thus stabilising the crack. The remaining depth of the bed is then re-pointed in mortar to match the colour of the existing mortar as closely as reasonably possible.
Masonry Beaming
Masonry Beaming
Masonry beaming is creating a structural beam within the masonry by installing lengths of ‘helibar’ at a set spacing and using the existing masonry to create a beam. This method is used where subsidence has been a problem and can be used in conjunction with underpinning.
