South London Bowing Wall Repairs

Bowing Wall Repairer For South London

A bowing or bulging wall is not a cosmetic problem. It is a structural one.

When the outer “leaf” or layer of a brick wall begins to move outward, whether slowly over years or more visibly in a short period, it means the masonry has lost restraint, and the movement will continue until the cause is addressed.

Action Wall Ties has repaired bowing walls across South London for over 30 years. Gable walls, front elevations, flank walls on terraces, rear extensions, etc. AWT’s surveyors see every variation of this defect every week across London’s SE and SW postcodes.

Whatever the cause, there is little we have not encountered and resolved.

Signs That a Wall is Bowing or Bulging

Bowing or bulging may develop gradually, and the early signs are easy to miss or dismiss. By the time the movement is obvious from the street, the wall has already been shifting for some time.

Have an AWT survey carried out if you notice any of the following:

• A wall face that appears convex or curved when viewed from the side or from across the street
• Horizontal cracking through the mortar bed joints at regular intervals up the wall
• Cracking at the junction between a gable or flank wall and the main structure of the building
• A gap opening between the wall and the roof structure, soffit or fascia above
• Vertical cracking at the corners of the building where the bowing wall meets a return wall
• Internal cracking corresponding to the location of the movement on the outer face
• A structural engineer or surveyor has noted wall tie failure or inadequate lateral restraint in a report
• The wall leans measurably when a plumb line is used to check it

Any of these symptoms warrants a professional assessment. Bowing walls do not stabilise on their own.

Why Walls Bow in South London Properties

South London’s housing stock covers a long sweep of construction history, and bowing walls occur across all of it and for overlapping reasons.

For solid brick properties, such as the Victorian and Edwardian properties found across South London, the most common cause is inadequate restraint. This may be due to deficiencies in the original building work or due to failures as the brickwork ages, such as de-bonded brickwork.

Across the Victorian terraces of South London, gable/flank wall bowing is one of the most common structural referrals AWT receives from surveyors and structural engineers.

Gable and flank walls, the large, uninterrupted side walls of terraced and semi-detached houses are particularly vulnerable. They lack window openings that would otherwise provide intermediate restraint, and they are often exposed to prevailing weather on their outer face.

For cavity wall properties, from the 1920s through to the 1980s, the most common cause is failure of the original metal wall ties. With age and corrosion, the wall ties lose the ability to hold the inner and outer leaves of the cavity wall together. Without the proper restraint, the outer leaf of brickwork, now effectively freestanding, begins to bow outward under its own weight.

In South London’s post-war low-rise blocks, inadequate wall tie density at the time of construction, below what is now understood to be the minimum, means walls that appeared stable for decades are now showing movement as the original wall ties approach the end of their service life.

The low-rise blocks of flats can also suffer from bulging or bowing brickwork due to concrete boot lintel issues, a lack of expansion joints or concrete frame shortening.

Other causes include thermal and moisture movement, loss of restraint at floor or roof level, and the removal of internal elements that previously provided lateral support to the wall.

How Action Wall Ties Repairs Bowing Walls in South London

AWT does not apply a standard fix. Every bowing wall repair begins with a survey – a physical assessment of the wall, the cause of the movement, the extent of the bow, and what is needed to stabilise it permanently.

The survey report sets out findings and recommendations clearly, including costs.

Depending on what the survey establishes, AWT’s repair methods for bowing walls include:

• Installation of stainless steel lateral restraints anchored through the wall into floor joists, ring beams to tie the wall back to the building frame and prevent further movement
• Remedial wall tie installation, replacing corroded ties with stainless steel resin-bonded or grouted ties to restore the structural connection between the inner and outer leaves of brick
• Bed joint reinforcement (BJR) – stainless steel helical bars installed into the mortar joints to create a reinforced beam within the wall, distributing loads and resisting further movement
• Crack stitching – where the bowing has caused cracking through the masonry, BJR stitching bars reconnect the fractured sections structurally
• Brickwork repairs and repointing – reinstatement of damaged mortar joints and individual brick replacement where the movement has caused localised spalling or loss of pointing
• Realignment of the outer leaf using AWT’s specialist equipment before restraint installation
• Concrete boot lintel repairs
• Remedial expansion joints
• Installation of Cintech sock anchors

The aim is always the same: permanent stabilisation of the original masonry without unnecessary demolition or rebuilding.

Industry-Leading Expertise You Can Have Confidence In

Decades of experience mean something when the person assessing your wall has seen the same defect in a hundred different properties across South London. AWT’s surveyors are not generalists.

They work in this discipline every day, which is why they can identify the root cause of bowing quickly and accurately, and why the repair specification they produce is right for your property, not a generic response.

AWT’s quality assurance covers three things that matter to South London homeowners:

• Continuous training. Every member of AWT’s team receives training from internal experts and from the manufacturers of the specialist equipment and materials used on site
• Recognised industry membership. AWT holds WTIF registration and works to BS EN ISO 9001 standards, providing independent verification of competence
• 25-year warranty offered on every project, providing long-term assurance on the repair works

S. Epstein of Ebco, a high-end contractor who has worked with AWT across multiple client properties, describes what distinguishes AWT as ‘the quality and care of the workmanship and an ability to find innovative solutions to complex problems that have saved clients both time and money’.

That is the standard AWT applies to every bowing wall repair in South London.

South London Areas Covered for Bowing Wall Repair

AWT covers all South London postcodes for bowing wall surveys and repairs. Properties seen regularly include:

• Lewisham, Catford and Deptford (SE4, SE6, SE8, SE13, SE14)
• Southwark, Bermondsey and Peckham (SE1, SE5, SE15, SE17)
• Lambeth, Brixton and Stockwell (SW2, SW4, SW9, SE11)
• Herne Hill, Tulse Hill and West Norwood (SE24, SE27)
• Greenwich, Blackheath and Charlton (SE3, SE7, SE9, SE10)
• Dulwich, Forest Hill and Sydenham (SE21, SE22, SE23, SE26)
• Wandsworth, Tooting and Balham (SW12, SW17, SW18)
• Streatham and Norbury (SW16, CR4)
• Bromley, Beckenham and Crystal Palace (BR1, BR2, SE19)

Not listed? Call 01227 721255 – AWT covers all South London postcodes.

Related Defects AWT Identifies During a Bowing Wall Survey

A bowing wall survey regularly uncovers related masonry defects that would continue to cause problems independently. AWT identifies and resolves all of the following:

• Cavity wall tie failure – where corroding ties are both causing the bow and have structurally compromised the wall as a whole
• Failing lintels -rotating or dropping timber, concrete, brick or steel lintels above openings in or adjacent to the bowing section of wall
• Cracking and dropping brickwork – localised masonry failure within the affected wall panel
• Spalling brickwork and failed pointing – where the movement has opened joints and allowed moisture ingress that accelerates further deterioration
• Corroded embedded mild steel arch bars and support angles within the bowing wall section that are expanding and driving cracking from within

Resolving all identified defects in a single programme of work reduces scaffolding cost, minimises disruption and eliminates the need for a return visit.

Book a Free Bowing Wall Survey in South London

If a wall on your South London property is showing signs of bowing, bulging or movement, the right step is a survey by a specialist. AWT’s surveyors will assess the full extent of the defect, identify the root cause and provide a clear written report with recommended works and costs.

Call: 01227 721 255

Email: enquiries@actionwallties.co.uk

Or use the contact form on the Contact Us page. AWT covers all South London postcodes and will arrange a survey at a time that suits you.