Thor Helical® Australia

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Updated: May 8, 2019

Crack Stitching Brick Corner Repairs

Thor Helical 6mm reinforcement bars may be pre-bent at 90 degrees so they can be used as concealed straps for stitching cracks at a corner of a building.

Vertical cracks are common at corners of masonry buildings. These fractures can occur for a variety of reasons including thermal/moisture movement. Perpendicular walls may expand towards each other in the direction of the corner, causing rotation of the brickwork and eventual cracking in the masonry near the corner. Alternatively, fractures can occur because of differential movements in a wall, for example where a bulging flank wall meets a straight and stable corner.

Reinforcing External Corners With Crack Stitching Bars

A series of helical bars, bent at a right angle, are bonded into slots with Thor WHO-60 polymer modified grout.

The bars form layers of concealed reinforcement for stitching cracks at a corner of a building, wrapping around the corner to improve buttressing.

Stitching Cracks At A Corner Of A Building With Long Drive Pins

Alternatively, a series of long drive-in helical wall ties are driven from the corner of a building into both flanking walls to form a succession of perpendicular tie straps. The wall ties corkscrew into small pilot holes when driven with the impact action from a rotary hammer-drill. The tie grips the brickwork along the entire length of the helix to provide a tension strap that reconnects and strengthens masonry adjacent to the cracked corner.

For more information www.thorhelical.com.au