STRUCTURAL REPAIR.
There are many different reasons for cracking in masonry structures. These problems can be overcome by using various combinations of Helical Systems masonry reinforcement products, which can also be utilised in new build situations.
The following illustration shows a typical two storey semi-detached property of solid wall construction with a later cavity wall extension.
CemFixes are installed with HeliGrout into clearance holes drilled to the required depth through the external walls and into the party walls
BowFixes are inserted through clearance holes in the masonry and power driven directly into the joist ends. They are then load tested before being bonded into the masonry with HeliResin or HeliGrout.
CemFixes are installed with HeliGrout into clearance holes drilled through the near leaf and at least 75mm into the far leaf. The density of the ties will vary depending on site conditions.
Slots are chased out on the internal wall into the corner. Angled holes of approximately 10mm diameter are drilled from the corner into the external wall. A HeliTie Bar is then inserted into the hole and grouted with HeliGrout.
A Helical Masonry Beam is inserted above the lintel and extended 500mm beyond the opening. Angled CemFixes are inserted through the lintel and into the beam above.
Where cracks are less than 500mm from an external corner or a reveal, at least 100mm of HeliTie Bar should be bent around the corner and bonded into the return wall or bent and fixed into the reveal.
BowFixes are inserted through clearance holes in the masonry and first joist, then power driven directly into the second joist. They are then load tested before being bonded into the masonry with HeliResin or HeliGrout.
Parallel lengths of HeliTie Bar are bonded with HeliGrout into chased out slots in the mortar beds between 1 and 14 brick courses apart and extended 500mm beyond each side of the opening to create a masonry beam. This beam not only spreads the building loads but also reinforces the masonry. - A masonry beam restrains bowing. The presence of a stairwell and the absence of joists prevent BowFixes from being used in this instance.
- A masonry beam spreads vertical loads where cracking has taken place.
Lengths of HeliTie Bar extending 500mm either side of the crack are inserted into mortar beds with HeliGrout.
The HeliTie Masonry Beam uses parallel lengths of HeliTie Bar bonded with HeliGrout into chased out slots in the mortar beds between 1 and 14 brick courses apart and extending 500mm beyond each side of the opening.
One point HeliTies are inserted using a hand tool or power support tool and, depending on site conditions, bonded with HeliResin or HeliGrout. Should site conditions prevail, the HeliTie can be driven into both leaves through a small pilot hole.
Ground Screws can be used to provide additional ground support for a structure. A masonry beam is inserted above to spread loads. Reinforcement and grout are inserted into the Ground Screw. A load test is carried out on site and, if required, additional lengths can be added. Once the required load is attained, the Ground Screw can then be capped with reinforcement and concrete. The Ground Screws can also be used as a method of support for earth retaining walls.
Slots are cut in the outer leaf every 450mm along the movement joint and a length of HeliTie Bar inserted. The HeliTie Bar is fixed on one side of the joint and sleeved on the other side along the whole length of the joint allowing normal movement but preventing lateral movement.
HERE IS A TYPICAL INSTALLATION OF GENERAL CRACK STITCHING CARRIED OUT BY OURSELVES.
ANOTHER APPLICATION CARRIED OUT BY OURSELVES
VERTICAL CRACK STITCHES
FINISHED RENDER PERFECTLY MATCHED
WHEN PAINTED UNNOTICEABLE
FINISHED PRODUCT
IF YOU WOULD LIKE A QUOTATION FOR STRUCTURAL RE-INFORCEMENT WORKS PLEASE CONTACT US BY CLICKING THE FOLLOWING LINK CONTACT US OR TELEPHONE OUR OFFICE ON 01872271615 THANKYOU. 
