bay window bowing brickwork piers & dropping arches

The subject building is a traditionally built mid-terraced domestic Victorian / Edwardian house in South London on two floors below a pitched tiled roof.

 

Bowing brickwork piers and cracking, dropping and sagging of the structure around the bay window required urgent attention. Using equipment and methods designed by Action Wall Ties, the bay window was reinforced and repaired

 



Detailed Case Study

 

Defect

 

Action Wall Ties investigation reported distortion and distress with localised cracking to ground floor external spandrel brickwork and cracking and dropped key stones to the brick arches.


The slender brickwork columns to the ground floor had bowed outwards leaving a bow shaped space between the timber box window frame and the brickwork column that has been repeatedly re-pointed.


The bay window has a very large overhanging cill with supporting corbelled knees   

Causation

 

Action Wall Ties reported that movement noted was considered to be progressive due to a combination of ageing and ineffective, restraining of the slender brickwork columns and rotational effect of the overhanging cills culminating in the bowing out of the columns and the arches to spread, crack and drop cracking the supported spandrel brickwork above.

Solution

 

Action Wall Ties provide a value for money, long term solution that stabilises the brickwork and retains the existing appearance with the minimum impact on occupants and the environment.

 

Our remedial scheme involved the introduction Bed Joint Reinforcement Beaming, Lateral Restraints, Reinforcement to the brickwork columns and Grout tie injection together with concrete repairs to masonry cill all to reinstate the uniformity of the wall and providing restraint.

 

Action Wall Ties services are available to clients throughout  London,  Kent, Sussex & Essex.  



We provide temporary support to the underside of the ground floor brick arch key stones, remove the debris from the crack and lift the stones /arch back into a more level line with the adjacent brickwork.



As indicated with red double dotted lines on our proposal 1, we introduced two rows of twin stainless steel corded joint reinforcement forming a deep masonry composite beam.

 
As indicated with Green parallel lines on our proposal 1, to form the beam and reconnect the bay window elevational brickwork, To Accomplish this with AWT designed equipment enabling us to diamond drill through each elevation and chase into the main elevational brickwork and install  grouted helical bar.

 

The formation of continuous beams within the existing masonry should redistribute the upper storey loads, to a large extent, to those parts of the supporting structure, below which are best able to carry them while at the same time assisting in restraining diagonal cracking and bulging tendencies.

 

 

 

 

As indicated with Yellow stars on our proposal 1, in conjunction with the beams, we drilled for and screw direct into the timber floor joists 8mm stainless steel lateral restraints all resin bonded to the masonry.

 

As indicated with Green parallel lines on our proposal 1, to assist in elevating the rotation affect from the large cills we installed Grout ties vertically, drilling for and injecting grouted 8mm helical bar.

 

As indicated with Blue parallel lines on our proposal 1, we introduced a purpose fabricated steel reinforcing post fitted and fixed to the inside of the brickwork columns fixed with stainless steel resin bonded fixings





Action Wall Ties (AWT) are specialists in masonry reinforcement and repair, providing professional solutions to a wide variety of structural problems. Contact us on 01227 721 255, or email us.




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