Subsidence repair wall tie repairs in Greater London
Stainless steel wall tie repairs for London cavity-built homes, sorted before the outer leaf starts to move.
What Subsidence repair wall tie repairs involves and when it applies
Wall tie repair services for Greater London properties, covering stainless steel tie installation and making good after corrosion or tie failure.
In a cavity wall, metal ties are bedded into the mortar courses to connect the inner and outer leaves. Ties put in before the mid-1980s were frequently mild steel protected by only a thin coating. When that coating fails, the steel corrodes, swells and can force apart the mortar around it, leaving the outer leaf with no structural link to the rest of the wall. The early sign is usually a series of horizontal cracks running along the outer leaf bed joints.
A specialist bores narrow openings into the outer leaf, fits new stainless steel ties at the required centres and fills each opening flush. Wall tie replacement applies once a survey has established that ties have corroded or broken, and it suits buyers who need the work done before they complete on a property built from the 1920s through to the mid-1980s. Greater London has a large stock of inter-war and post-war cavity-built properties in this bracket. The specialist will provide a quote after assessing the elevation and the full scope of work required.
Does your property show these signs?
Horizontal cracks appear at regular vertical intervals across the outer leaf, tracing the mortar bed courses
The property dates from between 1920 and 1980, a period when mild steel ties were standard and corrosion is a recognised issue
A surveyor or structural engineer has flagged possible tie failure in a written report without establishing how far the problem extends
The outer leaf appears to be curving or leaning outward when viewed along the wall face
A mortgage lender or conveyancer has requested documented evidence of tie condition before the sale or purchase can continue
An adjoining property in the same terrace has had tie corrosion verified and you want the condition of your own walls assessed
Steps a specialist follows for Subsidence repair wall tie repairs
Tie locating
The specialist runs a detector over the walls to mark where the existing ties are and where any are missing.
Sample test
A few ties are pulled against a gauge to see whether they still hold or have rusted through.
New ties
Stainless steel ties are drilled through the outer brick leaf into the inner wall at the spacing the job needs.
Hole filling
Every drill hole is filled with mortar close to the colour of the existing joints, and a short report is written up.
Helping property owners across Greater London
- Price confirmed in writing. The specialist sets out every cost on paper before a single day's work is scheduled.
- Findings you can keep. The specialist records the cause and extent of movement in a written report.
- Specialists who know Greater London. Firms covering Greater London understand the clay soils, drainage history.
- Decide in your own time. Read the figures, raise any questions you have, and go ahead only when you are satisfied.
What's included
- Scan to find where the old ties sit
- Pull-out test on a sample of ties
- New stainless steel ties fixed at the required spacing
- Drill holes filled to match the brickwork
- Written note of what was found and fitted
A typical wall tie repair on a standard semi-detached or terraced house across Greater London is usually finished in two to three days. Houses with multiple affected elevations or a significant amount of repointing work will generally require more time on site.
What shapes the scope of a wall tie repair
Locating failed ties
Mild steel wall ties fitted in cavity walls constructed between the 1920s and the mid-1980s deteriorate with age. When rust develops, the expanding metal forces apart the mortar bed joints in the outer leaf. The specialist identifies affected positions through visual examination and, where required, a borescope survey of the cavity.
Fitting new stainless steel ties
Replacement ties are driven or screwed through the outer leaf and fixed into the inner leaf at the required centres. Each hole is then made good to match the masonry around it. The new ties are placed where the wall requires restraint, which does not have to follow the spacing of the original ties.
Dealing with original ties that are still actively corroding
If the original ties are still expanding and bearing against the mortar joints, the specialist may cut or isolate them before the new ties go in. Relieving that pressure lowers the chance of fresh cracking appearing once the replacement work is complete.
Repointing and crack stitching
Bed joints damaged by tie corrosion are repointed after the new ties are secured. If cracking runs through several courses, the specialist may also advise stitching with stainless steel helical rods to rebuild tensile strength along the affected bed joints.
Subsidence repair wall tie repairs across Greater London
Specialists take on subsidence repair wall tie repairs across Greater London, with work in Barking and Dagenham · Barnet · Bexley · Brent · Bromley · Camden · City of London · Croydon and many more areas; pick a town to read about ground conditions and what the work involves there.
Related subsidence repair services
Effective subsidence repair work follows a logical order: investigate to establish the true cause, monitor where movement needs confirming, then apply the right remedy, which may be drainage repair, tree management, resin injection or, where genuinely needed, underpinning.
Subsidence repair crack monitoring
Dated crack measurement records for London homes and investment properties.
Drain filling for subsidence repairs
Redundant drain runs sealed and filled beneath London properties to stop ground movement at the source.
Subsidence repair drainage surveys
CCTV drain inspections that trace whether failing pipework is behind your subsidence.
Foundation repairs for subsidence repairs
Foundation repairs for London properties, matched to the ground conditions found on site.
Helical piling for subsidence repairs
Low-vibration helical pile installation for London homes and commercial buildings.
Subsidence repair resin injection
Resin injection for London properties where voids beneath a footing need filling without major excavation.
Retaining wall repairs for subsidence repairs
Retaining wall repairs for London properties, from drainage fixes to full structural stabilisation.
Subsidence repair structural surveys
Structural surveys for London homes, giving you a clear written account of what is happening and why.
Tree root assessments for subsidence repairs
Written root assessments for London homes where trees may be shrinking the clay below.
Underpinning for subsidence repairs
Underpinning for London homes, taking foundations down to ground that carries the load without shifting.
Void filling for subsidence repairs
Void filling beneath London floors and footings, restoring ground support before the structure above is affected.
Get a written quote today
Send the property address, a note on what you have spotted and which service fits. A specialist will come back with a written quote before any repair work is agreed.
- Free quote on every enquiry
- No obligation to proceed
- Covering all of Greater London