It is generally not recommended to put soil directly against a brick wall, especially if it is an exterior wall. There are a few reasons for this:
Moisture retention: Soil holds moisture, and if it is in direct contact with a brick wall, it can absorb and retain water. This moisture can seep into the brick and cause damage over time. Brick walls are typically designed to allow moisture to evaporate from the surface, and having soil against them can hinder this natural process.
Structural integrity: Soil against a brick wall can exert pressure on the wall, especially when it becomes wet. This additional pressure can compromise the structural integrity of the wall and lead to cracking or bulging.
Pest issues: Having soil directly against a wall can provide an entry point for pests such as termites or ants. These insects can tunnel through the soil and find their way into the structure of the building, causing damage.
If you need to have soil in close proximity to a brick wall, it is recommended to create a barrier between the soil and the wall. This can be done by installing a retaining wall or a suitable drainage system to divert water away from the brickwork. It's important to consult with a professional or a structural engineer to assess the specific requirements and conditions of your situation.