The brick on the exterior of a home is naturally porous to water. When it rains the bricks absorb large amounts of water. The brick acts as a sponge and soaks up this water and then releases it by evaporation once the rains have stopped. However, if there is a very large amount of rain, the bricks ability to absorb the water is overwhelmed and it can then leak into a home. A brick water repellent can stop rainwater from getting into the brick and stop leaks into a home.
Where Leaks Occur
Common areas for water to enter a home are around windows and doors. This can be caused by improper installation or defective flashing. Water flows down through the inside of the brick and then shows itself on the interior around windows and doors.
It is also possible to see water leaks where the house meets the foundation. Again, an improper or defective flashing may be causing water to leak over the top of the foundation. A less common area to see water on the inside of a home is in the middle of a wall. Most likely there is not a sufficient air gap between the brick and the interior wall and the water is simply wicking through.
Silane/Siloxane Brick Water Repellent
It is economically unfeasible to remove the brick from a home to repair the flashing. The best remedy is to apply a silane/siloxane water repellent to stop the water from getting into the brick in the first place. These work by penetrating into the brick and coating the edges of the microscopic pores in the brick. Liquid water will be unable to get into it. However, the pores are still open to let naturally occurring water vapor to get out. This reduces the effect of efflorescence and staining that can happen to bricks.
Natural Look Water Repellent
Silane/siloxane water repellents have the added benefit of being a natural look. This means that the brick will not change color, have a glossy sheen or surface film. In fact, because silane/siloxanes actually penetrate below the surface of the brick, they are extremely long lived. The natural traction and texture of the brick will be maintained.
Silane/Siloxane Water Repellent Advantages