This is a serious problem as you’re only seeing a small part of the black mold, as I’m fairly certain there is a lot more mold inside the wall. If your shower leaks behind wall, most times you can’t tell from the front side of the shower. https://turnbullmasonry.com/can-cause-water-damage-behind-brick-wall Flooding - water wicking up a wall into the insulation and up wall studs . A few weeks ago, a horrible nor’easter caused water to leak over her basement wall. Opening Weep Holes in Masonry Walls. Determine Where Your Shower Is Leaking. Hot Water Pipe - leaks shows as a warm area . This is usually cause by water spraying from the leak in back of the wall. Brick walls leak by nature. Allow me to explain the dynamics of brick walls, brick veneer and rain, and you’ll be able to do a fantastic job of protecting everything behind the brick. There is a small risk that the grapefruit-sized holes in your sheathing may allow wind-driven rain to enter your walls -- but that risk is quite small, because when rain runs down the cavity behind brick veneer, the water usually clings to the bricks, not the sheathing. Water penetration also provides the moisture that mold needs to grow on susceptible wall elements. https://www.askthebuilder.com/water-leaks-brick-wall-heavy-rain Repairing the holes with rigid foam and canned spray foam seems adequate to me. AD Brick walls leak water. Water coming in to the basement from over the top of the foundation can be from improperly installed or damaged thru-the-wall brick flashing and of course a leaking brick wall. https://gosmartbricks.com/wall-leakage-7-common-causes-of-brick-leaks The plumbing is between sheet rocked bedroom and exterior brick wall. She described it as a miniature Niagara Falls. Seepage can cause serious leaks or compromise the strength of the mortar that binds the concrete blocks whereas condensation often causes surface damage to block walls or encourages the growth of dangerous mold. "Over time, even the most watertight brick walls are going to leak, so let's assume they will and design for it," says Brian E. Trimble, PE, director of engineering services and architectural outreach with the Brick Industry Association. This is because the weep holes are poorly spaced or debris have stopped weep hole to function properly. The problem then would be the mortar between the bricks is failing and water is getting behind the brick, absorbed by the insulation and the drywall opposite the brick. The water is seeping out under brick onto the porch, but is not leaking into the bedroom. Moisture is one of the most difficult issues to detect in a building - the signs are subtle and easy to miss until water starts dripping from the ceiling. 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