Pressure washing is an effective method for removing excess mortar from newly laid brickwork. This process is essential for enhancing the aesthetic appeal of masonry projects and plays a critical role in preserving their structural integrity. Properly executed, pressure washing can significantly improve the longevity and appearance of brick structures.
Importance of Timing for Cleaning
Timing is a crucial factor in the cleaning process. It is recommended to wait at least seven days after the mortar has been laid before beginning the cleaning process. This waiting period allows the mortar to cure adequately, ensuring that it has reached sufficient hardness to withstand the pressure washing. See more about When to Schedule Brick Cleaning for New Home Builds here.
Preparation for Cleaning
Before cleaning, thorough preparation is essential to achieve optimal results and protect the surrounding environment.
1. Remove Mortar Clumps
Begin by carefully removing any large clumps of mortar using wooden paddles and non-metallic tools. Metal tools may damage the brickwork or leave behind fragments that oxidise and cause rust stains. Remove smaller particles with a fibre bristle brush.
2. Select the Right Cleaning Solution
Choose the right cleaning solution for the proper brickwork condition and application. Strictly follow the manufacturer’s instructions and recommendations. Verify the cleaning solution’s compatibility with the equipment. It is recommended to evaluate the effectiveness of cleaning solutions for overall cleaning starting from the gentlest solution and method in the following order: water, mild detergent, one-step chemical cleaners, and two-step chemical cleaners.
3. Protect Surroundings
Safeguard the adjacent materials and nearby plants. Cover and protect windows, doors, downpipes or other materials such as sealants and metals.
4. Saturate with Water
Surfaces have to be saturated with clean water to keep them from absorbing the cleaning solution. Low pressure is recommended for pressurised water cleaning. Surfaces below the area should also be saturated and kept wet until the final rinse to prevent streaking.
Cleaning Process
The cleaning process itself involves several key steps to ensure thorough and effective mortar removal.
1. Apply the Cleaning Solution
Dilute the chosen cleaning solution according to the manufacturer’s instructions. Use a masonry cleaning brush or a chemical sprayer to apply the solution evenly across the brick surface. Ensure that the solution penetrates the mortar stains effectively.
2. Pressure Washing
Utilise a pressure washer set to a pressure typically between 1800 to 2600 psi. Maintaining a distance of at least 30 centimetres from the surface is important to prevent excessive force that could damage the surface.
- Technique: Employ a sweeping motion while washing, moving from the top of the wall to the bottom. This technique helps to avoid streaks and ensures that dirt and mortar are effectively removed.
3. Post-Cleaning Care
Once the cleaning process is complete, it is important to conduct a post-cleaning inspection to ensure that the brickwork is in optimal condition. Examine the cleaned surfaces for any remaining mortar residue. If any stubborn spots persist, a second application of the cleaning solution may be warranted, followed by another round of pressure washing and rinsing.
Conclusion
Pressure washing is an invaluable tool for effective mortar removal from newly laid brickwork. By adhering to proper timing, preparation, and cleaning techniques, one can ensure that brickwork not only looks aesthetically pleasing but also maintains its structural integrity for years to come.