The UK is home to some of the world’s best architecture, and we don’t just mean modern buildings. There are many stunning examples of architecture from centuries gone by. Everywhere you’ll find the hallmarks of our ancestors efforts to satisfy their needs, sustain life and express themselves. With more than one in five buildings in… Read More
How to clean Brickwork and Terracotta
The right cleaning methods and processes will ensure your brickwork remains in top condition and you instantly notice any repair or remedial works required. Like when you clean natural stone, you need to keep several things in mind before brick cleaning and the same goes for cleaning any architectural terracotta in your building.
Both regular brick and terracotta are forms of fired clay but they have their own unique properties. This means your choice of cleaning method will differ, as you need to be mindful of the sensitivities of each material and how they react differently to different cleaning processes.
Understanding your Brick Cleaning Project
Before carrying out any brick cleaning it is essential you’re properly aware of the right methods for cleaning, the pressure you can use and the dilution of chemicals suitable to the project in hand. Understanding how the brick or terracotta react to dirt and also how to safely remove this dirt minimises the risk of causing any damage to the brickwork.
The mortar used in your home is also an important consideration. Most traditional brickwork mortars use soft mixes, usually of lime and sand. This means the mortar is often softer than the bricks themselves and may not be able to withstand high pressure washing and may be irreparably damaged without due care.
Other considerations before cleaning brickwork include taking into account any plant or moss growth and assessing the amount of weathering present. It’s also important to remember to consider the porosity of the brickwork as more porous bricks will have higher absorbency which can impact the use of chemicals.
Brick Cleaning: Returning Established Brickwork to its Best
Cleaning established brickwork often poses a problem because the atmospheric soiling that coats it can’t simply be cleaned with water. Non-soluble dirt and grime usually need to be cleaned from the brickwork using something in addition to water. This is usually a chemical or a form of abrasion.
Abrasive cleaning should only be carried out by experienced professionals who understand the right levels to achieve proper cleaning of the brickwork without the risk of any damage. The wrong level of pressure or abrasives could potentially damage the brickwork beyond easy repair and may result in more restorative work becoming necessary.
Using chemical cleaning on established bricks is also a balancing act. Low-strength chemicals are best, and it is usually best practice to apply them neatly directly onto the brick. Once the chemicals have been left long enough to process, the brickwork should be thoroughly rinsed at a suitable low pressure.
Cleaning Architectural Terracotta
Since the mid-19th century terracotta has been used in home building and it is still present in many properties. It needs to be treated sensitively as it is can very easily be damaged beyond repair and can then be difficult to replace.
Most soiling found on terracotta is also non-water-soluble making it impossible to clean using just water. Glazed and unglazed terracotta can be easily damage if any level of abrasion is used and the same is true if cleaning is carried out using acid-based or alkaline-based cleaning. Mechanical cleaning is also not recommended due to the risk of damage.
Terracotta often looks extremely dirty and soiled, as it may be covered in a black film, but this layer is usually much thinner than it looks and with the right mix of chemicals and care can be removed.
Sensitivity and care is needed when approaching any brick cleaning project, especially on older buildings where the brickwork is many years old. It’s important to think carefully before beginning any project and of course, working with brick cleaning and restoration specialists ensures a professional level of cleaning throughout.
You may also like
The welcome news that London’s Grade II listed Battersea Power Station has been removed from Historic England’s Heritage at Risk Register is another reminder of the importance of preserving historic buildings. Built in 1929, the Power Station was decommissioned in 1983 and, after years of neglect, added to the Register in 1991. But after extensive… Read More
Today’s façades reflect commercial intent, push design boundaries, change environments and showcase engineering capabilities. Are modern day façades merely used as a tool to showcase design progression and engineering egos? Are we considering the façade skin and the role it plays in influencing the urban landscapes of our future? With so much emphasis placed on… Read More
As the global economy tries to recover from its last dip, huge investments are being made in the construction industry, both in established and emerging markets. It’s anticipated that the volume of construction output will grow by more than 70% to achieve an annual worth of $15 trillion worldwide by 2025 (Source: Global Construction Perspectives… Read More