What is wall tie replacement?
Wall ties are used to join the internal and external walls of a cavity wall and are installed during construction.
Over time these wall ties start to corrode and require replacing – particularly where the steel wall ties have had little protection. The expansion caused by this type of corrosion can force apart mortar joints causing cracks to appear. Other symptoms include bulging of walls, roof edges lifting and in severe cases the whole wall can collapse.
Wall tie corrosion is often found in buildings that are situated in coastal areas and in masonry that has been constructed using corrosive black ash mortar. However, because most buildings will outlast the life expectancy of the wall ties installed during construction, wall tie replacement will be necessary at some point for most buildings constructed using cavity walls.
What are replacement wall ties?
Wall tie replacement is carried out using special types of wall tie which have been specifically developed for use on existing walls. Wall ties intended for use when constructing new walls should not normally be used for wall tie replacement.
In most cases the age and location of the property will determine how its wall tiles have been constructed. The most common types are as follows:
- Metal – More recently, stainless steel is the chosen type but historically mild steel, copper, wrought iron and cast iron have been used. Wrought and cast-iron ties tend to be quite heavily constructed and if found to be corroded will in most cases need to be removed. Copper ties are quite rare mostly down to their cost but are in fact very hardy and long lasting
- Brick or Terracotta – Found rarely and normally isolated to specific regions. They also have several disadvantages in that they have been found to create cold bridges to inner walls allowing moisture and cold to travel along them.
- Stone or Slate – Again, not commonly found and come with some disadvantages that include a tendency to snap and crack when movement is present. However, they are quite resistant to corrosion and if featured in a property where there is no evidence of movement should last a good long while. Once again however, this type of tie can transfer moisture and cold to the inner skin.
What is the best wall tie for my property?
Choosing the type of replacement wall tie to use is an important part of the replacement process. However, this will depend on several factors including:
- The type of masonry
- Whether or not the cavity contains insulation materials
- Fire performance requirements.
- Width of cavity
Replacement wall ties are supplied in a variety of lengths due to the fact that the width of the cavity can vary between cavity walls.
Wall tie replacement procedure
The wall tie replacement procedure can be broken down into five elements:
- Investigation – This is the collection of information about the types and conditions of masonry, cavity width, type and condition of existing wall ties.
- Removal – Remove the existing wall ties depending on condition.
- Specification – Choice of remedial wall tie type – density and layout of remedial wall ties.
- Installation – We will install/replace the old wall ties with the new ones
- Quality Control – Visual checks, torque testing and more.
Wall tie replacement Newcastle
Brickwork Direct provide a variety of wall tie replacement and repair solutions for private properties as well as our commercial clients. Our company has 15 years of experience successfully replacing wall ties throughout the North East.
As specialists in brickwork, our wall tie replacement services include Cavity Wall Tie Replacements, Remedial Wall Ties, Identifying Wall Tie Failure and Wall Tie Corrosion. Brickwork Direct’s fully trained teams can review and diagnose any structural issues you may have, get in touch today.