Wall Tie Surveyor Inspecting Cavity Wall and Surveying Property
Based upon the age of the property and any proposed work (rear, front or side extension, internal reconfiguration, loft conversion etc.) UK Wall Ties will often recommend a survey. Our surveying services aims to ascertain the integrity of current structural wall ties before the instruction of an independent structural engineering programme of remediation. The survey will identify the stage of corrosion, a programme of recommended works (wall tie reinstatement) or sequential monitoring.
Wall Tie Corroded Within Cavity Wall
Wall ties within a cavity wall can become corroded. The corrosive process is individual to the type of wall tie, age of brick tie and also the precision of install. It is not uncommon for wall tie corrosion to be accelerated due to quality on install and the level of moisture within the cavity.
Delamination of Outer Leaf of Wall Leading to Collapse
Delamination of Outer Leaf of Wall can occur where the outer leaf stone wall moves away from the inner leaf thereby separating the bedding planes from each other. Bed joint reinforcement is often required redistributing the structural load over a wider area.
Outer Leaf of Cavity Wall Collapse Due to Wall Tie Failure
If the number and location of wall ties are insufficient, corroded or poorly installed, serious structural issues can ensue. In severe circumstances wall tie failure can result in a complete collapse of an outer leaf brick wall usually at first floor level.
Wall Tie Reinstatement
Wall Tie Reinstatement is becoming more common in the United Kingdom. Following a survey and a structural engineer report wall tie replacement may be undertaken. The process involves identification of the existing wall tie, reinstatement of a wall tie followed by isolation or removal of the existing wall ties.
Lateral Restraint (Lateral Bracing) of External Wall
Lateral restraint is often characterised by the outward movement of an outer wall which is a common failure in a period property. Lateral restraint is often required due to inadequate tying and connection of the outer masonry wall to the floor and ceiling joists. Internally lack of lateral restraint is identified by bowing or bulging walls. End of terrace gable and flank elevations are areas most affected by lack of lateral restraint.