Bed Joint Reinforcement Beaming

Bed Joint Reinforcement Beaming

Victorian property in Hampstead, NW3. Three-storey bay windows with pulling away outward movement, dropping brickwork (all with previous failing repairs) and bowing side flank wall. Repaired using bed joint reinforcement beaming, lateral restraints, crack stitching, and resin bonded ties.

case study 56e199d5b84726.15696458 - Bed Joint Reinforcement Beaming

The subject building was a substantial Victorian end-of-terrace domestic residence in North West London.

Structural Problems

Outward movement to the gable wall, patress plates and tie bars were noted, which indicated that a previous attempt to restrain the outward movement had been made. No significant cracking was noted. Also, a steel band to the front bay window on the first and second floors was found to be heavily corroded and delaminating.

Causation

The movement noted is progressive, attributable to historic subsidence (downward movement) compounded by outward movement due to ineffective or inadequate restraining to the main elevational walls and the bay window, allowing the brick arch to spread and drop and the brickwork above to crack.

debonded brickwork bulges 1.3 - Bed Joint Reinforcement Beaming

Structural Solutions

AWT’s remedial scheme was to introduce bed joint reinforcement beaming, lateral restraints, crack stitching and resin bonded ties – adding tensile strength and restraint and thus reinstating the brickwork’s integrity and the uniformity of the wall.

After installation, pointing was raked out, reinstated and tinted to match the existing (see coloured remedial works on our proposal picture).

case 5 a - Bed Joint Reinforcement Beaming

case 5 b - Bed Joint Reinforcement Beaming

1. Bed joint reinforcement:
The introduction of two rows of twin cord reinforcement, forming a deep masonry beam – as indicated with red double dotted lines on our proposal images.

2. Lateral restraints:
In conjunction with the beam, 8mm stainless steel lateral restraints were introduced and screwed directly into the timber floor joists’ end grain or into the side grain, all resin bonded to the masonry – as indicated with yellow stars on our proposal images.

3. Crack stitching:
To stitch localised cracks, single 8mm stainless steel corded joint reinforcements were introduced – as indicated with red single dotted lines on our proposal images.

4. Wall ties to de-bonding brickwork:
Wherever possible, we drilled for and resin bonded 6mm stainless steel remedial ties to the centre of a brick. We then re-pointed the disturbed areas with a coloured sand and cement mixture – as indicated with blue line on our proposal plan images.

5. Making good and pointing:
We then raked out the existing mortar and repaired with new coloured sand and cement mortar to approximately 20mm in depth.

AWT operatives are highly skilled in traditional building methods and always attempt to match replacement bricks, pointing styles and mortar colour to be sympathetic with the existing building.

High Quality Structural Repairs

The photo below shows the completed structural repairs 14 years after the project was completed. Unlike the previous repairs by traditional builders, AWT’s structural repair techniques got to the root of the problem.

AWT provide long lasting, cost effective structural repairs so you can enjoy your home.

Bed joint beaming - Bed Joint Reinforcement Beaming

Read our frequently asked questions about bay window structural repairs.

Action Wall Ties (AWT) based in Kent are specialists in masonry reinforcement and repair covering London, Kent and the whole South East area. AWT provide professional solutions to a wide variety of structural problems. Contact us on 01227 721 255, or email us.

Bowing gable wall 1950s style two-storey semi

1950s Semi with Bowing Gable Wall

Bowing gable wall to a 1950s style semi-detached house in Sittingbourne, Kent. Remedial wall ties, isolating the existing ties, bed joint reinforcement beaming, crack stitching and lateral restraints.

case study 572c74b2d05cb8.37806035 - Bowing gable wall 1950s style two-storey semi

The subject property in Swale, Kent, comprised a 1950s style two-storey semi-detached house of cavity brickwork construction.

Problem – Gable wall bowing & cracking

The gable wall: The right side gable wall had a visible outward bulge at the centre of the wall at first floor level and significant cracking was noted (no corresponding internal cracking was present). The front elevation external skin was rebuilt after suffering damage in a hurricane. No downward movement at DPC level was noted.

An AWT investigation with a metal detector and an endoscope revealed that the wall ties viewed to the right side gable wall and rear elevations were mild steel vertical twist ties, all in a similar heavily corroded condition and showing signs of de-laminating.

Horizontal cracking, lifting and opening up of joints were noted at irregular intervals on the right side and rear elevations, with corroding ties clearly visible.

Discussion

Right side elevations: We believed that the movement was progressive, due to ineffective and/or inadequate restraining, and not attributable to significant subsidence.

Wall ties: Our opinion, in accordance with the Building Research Establishment’s recommendations, was that the symptoms noted above were likely to be representative of the majority of the cavity wall ties to the right side, and the main rear elevation suffering from corrosion.

It was believed that the building’s right side and main rear elevation would benefit from remedial wall ties and the isolation of the existing ties.

The Ridgeway - Bowing gable wall 1950s style two-storey semi

Structural Repair Solution

AWT completed a remedial scheme providing a viable repair by introducing remedial wall ties, isolating the existing ties, then employing bed joint reinforcement beaming, crack stitching and lateral restraints.

Remedial wall ties and isolation of existing ties: Our operatives undertook remedial wall tie treatment to the right side and main rear elevations in accordance with AWT’s wall tie treatment – Generic Repair.

Bed joint reinforcement beaming: The introduction of two rows of twin 8mm stainless steel corded joint reinforcement forming a deep masonry beam – as indicated with red double dotted lines on our proposal plan.

Crack stitching: We stitched localised cracks with the introduction of single 8mm stainless steel corded joint reinforcement – as indicated by red single dotted lines on our proposal.

Lateral restraints: At approximately 900mm centres we drilled for, and screwed directly into alternate timber floor joist’s end grain or into the side grain, 8mm stainless steel lateral restraints into the timber floor and ceiling joists, all resin bonded to the masonry along with corresponding wall ties – as indicated with green stars on our proposal plan.

Make good the pointing: To the cracking schedule for reinforcement listed above, and to areas of weakness to pointing to the right side elevation, we raked out the existing cracked mortar and repaired with new coloured sand and cement mortar to approximately 20mm in depth. AWT operatives are highly skilled in traditional building methods and always attempt to match replacement bricks, pointing styles and mortar colour to be sympathetic with the existing building.

Homeowners, landlords, housing associations and councils across Kent, London, Surrey and Sussex can call on AWT’s experts to repair rusting wall ties and other structural problems. Action Wall Ties (AWT) are specialists in gable wall repairs, masonry reinforcement and repair. We provide professional solutions to a wide variety of structural problems. Contact us on 01227 721 255, or email us.

Terracotta Facade Bowing Out

Terracotta Facade Bowing Out

East Ham Town Hall in East London. Main terracotta facade bowing out – precise drilling deep into the building and installation of Cintec anchors

case study 56e19be036cf66.29626384 - Terracotta Facade Bowing Out

East Ham Town Hall, in the E6 area of London, is an important landmark building, and its hundred year old brick and ornate terracotta construction requires specialised care when remedial works are called for.

LB Newham engaged Action Wall Ties to undertake reinforcing works to stabilise the important facade of the town hall. External cracking was spreading across the entablature frieze cornice above the left side entrance.

Problem – cracking and debonding brickwork

1. The main entrance – Above the staircase and to the left side of the entrance cracking was noted between the internal junction of the external brickwork, the dividing wall and the corner of the ceiling above.

2. The floor slab and ceiling – Cracking was noted on the 150mm floor slab that was found to be of a clinker rich material.

3. Brickwork – There were no signs of significant cracking to brickwork, although the movement noted was considered likely to be progressive. It was apparent that the outer brickwork was bowing outward, de-bonding from the dividing walls, and had become unconnected, cracking the dividing walls and floor slab – all reducing the restraining to the facade.

debonded brickwork bulges 1.3 - Terracotta Facade Bowing Out

case 33 a - Terracotta Facade Bowing Out

Proposed Cintec Anchor solution

Action Wall Ties completed a remedial scheme providing a viable repair by the introduction of Cintec anchors.

1. AWT entered the terracotta by diamond drilling with a narrow wall diamond core drill and retained the core to be replaced.

2. AWT then diamond drilled a 38mm × 4 metre hole through the external wall into the floor slab and the dividing wall as indicated with red crosses on the accompanying image.

3. AWT supplied and installed Cintec 40mm sock anchors with 18mm stainless steel bar, in accordance with the manufacture’s recommendations by certificated operatives.

4. The entrance hole in the terracotta was made good by the replacement of extracted core together with replacement bricks and coloured sand and cement pointing, all in accordance with AWT specifications.

Action Wall Ties (AWT) are specialists in masonry reinforcement and repair, including specialised mediums such as Terracotta, providing professional structural repair solutions with Cintec anchors to a wide variety of structural problems in London, Sussex, Surrey and Kent.  Please contact us on 01227 721 255, or email us to discuss your structural repair issues.

Grade I listed country house with detached bay window

Grade I listed country house with detached bay window

Madingley Hall, a 15th Century Oriel large bay window became detached – complicated diamond drilling pattern and installing Cintec sock anchors

case study 56e19bec9cf292.04166233 - Grade I listed country house with detached bay window

Madingley Hall is an elegant Grade I listed country house built by Sir John Hynde in 1543 and set in its own expansive gardens.

The hall is now owned by Cambridge University, and Action Wall Ties were engaged to undertake reinforcement works to stabilise the front bay of the building.

Over the years the Oriel bay had become detached from the main building. The internal walls of the bay were finished with oak panelling along with ornate plaster works, all of which were protected by listing in their own right.

Repairing The Detached Bay Window

case 34 a - Grade I listed country house with detached bay window

A complicated cross stitch anchor was proposed to stabilise the bay and preserve the integrity of this historic building.

Cintec Sock anchors

Action Wall Ties’ operatives diamond drilled 30mm diameter holes approximately 3.8 metres in depth and a second hole, angled off approximately 1 metre, into the masonry to meet and form cross ties to each side of the bay window at five levels.

They then prepared for, supplied and inflated the Cintec sock anchors in accordance with the specifications and manufacture’s recommendations.

This work was completed by AWT Cintec certified operatives.

case 34 b - Grade I listed country house with detached bay window

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

Stabilising stone and flint dormer window

Stabilising stone and flint dormer window

Stabilizing stone and flint dormer window at King’s School, Canterbury – diamond drilling for, and installing, grouted ties

case study 56e19bf5d19013.59175950 - Stabilising stone and flint dormer window

King’s School is possibly the oldest school in England, believed to have been established over 400 years ago. AWT were engaged to undertake remedial works to stabilise a stone and flint fronted gable dormer window of this substantial, historic school building. We used lateral restraints and grout ties to remedy the problem and offer an effective repair solution.

Problem – movement and rotation of gable masonry

• The dormer gable masonry was of stone window mullions and copping stones with a flint infill backed with brickwork.

• The dormer gable masonry had suffered from significant outward movement, leaving a gap between the flashings and the dormer roof.

• The masonry appeared to be rotating outwards on the joints to the stone window mullions.

• No fixings to the masonry and the roof structure were noted.

Discussion

case 35 a - Stabilising stone and flint dormer window

From our findings it was apparent that the building had suffered from movement over a period of time. It was deemed that this movement was progressive, due to current ineffective and/or inadequate restraining.

The Repair Solution – Lateral Restraints

AWT completed a remedial scheme providing a viable repair, through the introduction of lateral restraints and grout ties to reconnect the substance of the wall and restrain the same.

• Grout ties: To connect the substance of the masonry stone and flint of the gable wall, AWT installed remedial grout ties by drilling for, and injecting, grouted 8mm helical bar – as indicated with green stars and parallel lines on our proposal plan images.

• Lateral restraints: In conjunction with the grout ties we installed stainless steel ties, screwed into the side grain of the timbers behind and resin bonded to the masonry – as indicated with yellow stars on our proposal plan images.

Action Wall Ties (AWT) are specialists in masonry reinforcement and repair including historic flint and stone walls, in Kent, Surrey, London and Sussex.

Our Lateral restraint solutions are permenant and effective, creating a better than new outcome.

We are successfully providing professional solutions to a wide variety of structural problems. Contact us on 01227 721 255, or email us.

The Smithery, Historic Dockyard Chatham

The Smithery, Historic Dockyard Chatham

Historic dockyard Chatham The Smithery – long 3500mm diamond drill for and installing grout ties and Cintec ties

case study 56e19bfed8e1a2.17216075 - The Smithery, Historic Dockyard Chatham

The Smithery at The Historic Dockyard Chatham, a Scheduled Ancient Monument and Grade II* listed building.

The Smithery, built in 1808 and the last building within the walls of The Historic Dockyard Chatham on the English Heritage ‘at risk’ register has been saved.

This important historic building fell out of use in 1974 and is in a very poor condition, funding has enabled emergency stabilisation works to commence.

case 36 a - The Smithery, Historic Dockyard Chatham

case 36 b - The Smithery, Historic Dockyard Chatham

Action Wall Ties diamond drilled a pattern of 50mm diameter holes horizontally, 3500mm in depth through mass brickwork, prepared for the supply of Cintec sock anchors M16 x 3500mm anchors and inflated in accordance with the specification and manufacturers recommendations by certified operatives.

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.

Stabilising Victorian gable wall stone corbels

Stabilising Victorian gable wall stone corbels

Stabilising Victorian gable wall stone corbels, pediment and copings – diamond drilling for, and installing, grouted and Cintec ties

case study 56e19c07c925b7.93748528 - Stabilising Victorian gable wall stone corbels

The subject building is a substantial Victorian traditionally-built house featuring a gable embellished with substantial supporting stone corbels, coping stones and pediment in North London.

This property required work to remedy the rotation of the supporting stone corbels and dislodged copings without detracting from the look of the property.

Action Wall Ties have highly trained staff with a wealth of experience in dealing with period properties. We used our own design of diamond drilling equipment to drill for, and install, ties strengthening the structure.

case 37 a - Stabilising Victorian gable wall stone corbels

Detailed Case Study

Problem: Stone Corbel Movement

The gable wall had a substantial stone corbel supporting the stone coping stones. Rotating and outward movement was noted to the stone corbel together with cracking to surrounding brickwork as well as dislodged coping stones and pediment.

Discussion

Action Wall Ties’ remediation works were designed to assist in restraining the masonry to return the integrity to the structure.

case 37 b - Stabilising Victorian gable wall stone corbels

Stone Corbel Repair Solution

Remedial work by Action Wall Ties provided a cost effective long-term solution. The existing appearance of the building was maintained. Work was carried out with the minimal amount of disruption to residents and the environment.

case 37 c - Stabilising Victorian gable wall stone corbels

case 37 d - Stabilising Victorian gable wall stone corbels

The remediation works involved diamond drilling 38mm X 2000mm holes into stone corbels, and others into the pediment and stone coping, to accommodate installation of remedial Cintec 40mm sock anchors.

case 37 e - Stabilising Victorian gable wall stone corbels

case 37 f - Stabilising Victorian gable wall stone corbels

Cintec anchors installed in accordance with manufacturer’s recommendation and by Action Wall Ties’ trained certificated operatives.

case 37 g - Stabilising Victorian gable wall stone corbels

Action Wall Ties serve customers throughout the South East i.e. in Kent, Greater London, Sussex and in Essex.

Action Wall Ties (AWT) are specialists in masonry reinforcement and repair, providing professional solutions to a wide variety of structural problems including issues with stone corbels, pediment and copings in Victorian properties. Contact us on 01227 721 255, or email us.

Bulging Brickwork and Brick Slips on 60s /70s Apartment Blocks

Bulging Brickwork and Brick Slips on 60s /70s Apartment Blocks

Concrete frame blocks of social housing in Wandsworth, London with clearly visible bowing to the brickwork and infill brick slip. Defective support to infill wall with cracked and detached brick slips.

case study 59c4e3a8718581.79784909 1 - Bulging Brickwork and Brick Slips on 60s /70s Apartment Blocks

The Structural Problem

The structural survey report on this South West London social housing block

The survey of these circa 1960s/1970s blocks of flats revealed, that due to a construction defect, the external brickwork had insufficient support. AWT also found heavily corroded wall ties plus a lack of weep vents and no horizontal expansion joints.

The infill wall external brickwork was originally only supported onto the concrete floor beam by less than 50mm. Where the wall had bulged outward this was reducing the support to just 30mm with the loads onto the brick-slips causing them to bulge out.

Our Structural Repair Solution

The infill wall brickwork was leaning and in danger of becoming detached. AWT promptly made the elevation floor safe (erecting a scaffold to provide access) by installing AWT’s specially developed props.

Wandsworth works - Bulging Brickwork and Brick Slips on 60s /70s Apartment Blocks

The remedial work included:

  • Installation of stainless steel support angles and cavity trays

  • Clearing debris from the wall cavities

  • Rebuilding the brickwork by removal, re-bedding and fixing of brick slips

  • Installation of stainless steel wall ties

  • Provision of horizontal expansion joints.

Repair and Replacement of Brick Slips

The original bricks and brick slips were reused when possible. Replacement bricks, mortar and sealants were colour matched to maintain the visual integrity of the apartment blocks.

Wandsworth finished - Bulging Brickwork and Brick Slips on 60s /70s Apartment Blocks

Action Wall Ties are the apartment block structural repair specialists. Our brick slip and wall tie replacement solutions are available to clients in the South East i.e. in London & in Kent, Sussex, Surrey & Essex.

Action Wall Ties (AWT) are specialists in structural repairs to concrete framed buildings and tower blocks. From movement issues to wall tie replacement and brick slip repairs. We provide specialist professional solutions to a wide variety of structural problems. Contact us on 01227 721 255, or email us.

Bowing and Bulging Wall

Bowing and Bulging Wall

The joint owners of this 4 storey semi-detached Victorian villas (converted into flats) reported visible bulging, dropping brickwork arches to the rear and gable solid brickwork walls and long cracks developed internally.

case study 5b62f1ba37a455.34142644 - Bowing and Bulging Wall

The Structural Problem

The Action Wall Ties surveyor inspection identified ineffective and inadequate restraining plus spreading of the of the brick arches as the root cause of the problem. This had allowed the main elevation brickwork to bulge outward and brick arches over the doors and windows to spread and drop causing the brickwork above to crack. It also caused long cracks in the internal plaster work of the flats.

Bronsbury front view - Bowing and Bulging Wall

This is a common problem with properties of this type and age. As well as damaging the structural integrity of the property it often makes doors and windows difficult to open and close as the frames are warped by the pressure of the sagging brickwork load above.

Restoring Structural Integrity

The introduction of remedial reinforcement to the masonry and lateral restraints was recommended to provide restraint and support to restore the brickwork’s integrity.

Specialist equipment developed by Action Wall Ties was used to install bed joint reinforcing beaming, stainless steel lateral restraints and pins within the structure of the property. This restored the structural integrity of the masonry without the need for any visible restraints.

The cracked mortar was raked out and repaired with new coloured sand, lime and cement mortar that was a match for the existing mortar’s colour and texture.

Action Wall Ties’ specialist knowledge allowed them to restore the property’s structural stability without the need for costly rebuilding work. Their specialist equipment also minimised the disruption for the residents.

Action Wall Ties (AWT) are specialists in masonry reinforcement and repair, providing professional solutions to a wide variety of structural problems including issues with bowing and bulging brickwork in Victorian properties. Contact us on 01227 721 255email us or use our contact form.

Action Wall Ties serve customers in North West London and the whole South East of England.

Rendered Victorian Terrace with Bulging and Sagging Brickwork

Victorian Terrace with Bulging and Dropping Brickwork

This Victorian terraced home with rendered brickwork in Walthamstow, East London was suffering with dropping and outward bowing of the brickwork.

case study 5ba50c25294103.83954636 - Rendered Victorian Terrace with Bulging and Sagging Brickwork

The Problem

This rendered Victorian terrace home in Walthamstow, London E17, was suffering with significant distortion of the masonry. It also had dropping and outward bowing movement of the brickwork on the upper floor.

The left hand side external brickwork had bulged outward from the centre first floor. Internal movement to the junction of the dividing wall and external wall was also noted.

If structural repairs are sought early enough, AWTs specialist repair techniques may allow for repairs without removing render/pebble dash finishes. However, due to the advanced structural issues with this property, it was necessary to remove the render.

 

barclay upper floor - Rendered Victorian Terrace with Bulging and Sagging Brickwork

The Solution

The first step, after the initial survey, was to carefully remove the render finish on the front elevation to expose the underlying brickwork. As well as giving access to the brickwork this also allowed for a secondary survey to ensure there were no further issues with the masonry.

Our remedial work included:

  • Bed Joint Reinforcement Beaming
  • Crack Stitching
  • Fenestration Lintel Repair
  • Lateral Restraints
  • Grout Tie Injection
  • Brickwork Repairs
  • Realignment and Pinning of the Coping Stones

The repair work was designed to reinstate the uniformity of the walls and provide restraint in order to restore the tensile strength of the brickwork. It was also necessary to reconnect the main elevational brickwork to the brick internal dividing and party walls.

Action Wall Ties used specialist drilling rigs that enable precision drilling. State-of-the-art stainless steel fixings were then installed within the framework of the building. These techniques have been designed to deal with the root cause of structural faults rather than just provide a short-term cosmetic fix.

Carefully matched coloured sand and cement mortar was used to make good the drill holes. As can be seen in the photo, there are no visible fixings once repair works are complete. The exposed brickwork is left clean, tidy and ready for repointing. The facade of the house can either be left as exposed brick or the render can be replaced if desired.

barclay render removed - Rendered Victorian Terrace with Bulging and Sagging Brickwork

AWT’s specialist skills allowed these serious structural faults to be repaired quickly and economically. No long and costly rebuilding work was required.

Action Wall Ties (AWT) are specialists in masonry reinforcement and repair. AWT can advise on structural repairs to properties with render, pebble dash and spar dash. We provide professional solutions to a wide variety of structural problems for home owners in East London as well as the rest of London, Kent, Surrey and Sussex. Contact us on 01227 721 255, email us or use our contact form.

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