It is best practice to consider using grout below flashing in a masonry cavity. Providing a solid backing beneath the flashing helps support the flashing system and maintain its intended performance.
By filling the open cavity below the flashing with a solid backing, the flashing is prevented from deflecting downward during lap seam creation. This support helps ensure that the flashing remains securely anchored to the masonry assembly.
Maintaining proper support also helps preserve the slope of the flashing so water is directed away from the structure.
It is important to select a non-shrinking, non-metallic grout that can withstand weathering and environmental exposure. The grout should be applied in a continuous and consistent manner to avoid voids or air pockets that could compromise performance.
Proper installation of grout below flashing contributes to both durability and effective water management within the wall assembly.
Using grout below flashing helps maintain flashing alignment, supports proper slope, and improves drainage performance in masonry cavity walls. Careful material selection and consistent installation are essential for long-term reliability.
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