A sill is essentially a roof for your wall. Beneath the sill material, you must install through-wall flashing. This membrane catches any water that gets through the brick or mortar and directs it to the weep holes. Without this, water saturates the wall cavity.
If you own a brick home, check your sills annually. brick sill detail
How the bricks are laid significantly impacts both the look and the durability of the sill: A sill is essentially a roof for your wall
This is the most commonly missed detail in modern construction. On the underside of the projecting sill, there should be a groove or notch known as a or drip edge . Without this, water saturates the wall cavity
Whether you are an architect specifying a new build or a homeowner renovating a historic masonry structure, here is what you need to know about brick sill details.
To effectively divert water, the top surface of the brick sill must slope downward and away from the building, typically at an angle of at least 15 degrees . The sill should also project at least 1 inch (25mm) to 45mm beyond the face of the wall to ensure water drips off rather than running down the facade.