Thru-wall Flashing
Thru-Wall Flashing
Modern masonry relies on thru-wall flashing as a critical line of defense against moisture infiltration. While historic structures often utilized solid brick walls to manage water, contemporary architecture typically favors lightweight steel studs and gypsum board faced with a thin brick veneer—a design that is inherently more vulnerable to the elements. By installing flashing behind the exterior masonry, moisture is actively directed away from the building’s core, ensuring the interior remains air and watertight. Without this essential barrier, trapped water can penetrate the structural backup and lead to severe rot, mold, and long-term instability; professional installation effectively prevents this decay, keeping your masonry looking crisp and your structure’s integrity intact.
FAQs
What is thru-wall flashing, and why is it so important for masonry buildings?
Thru-wall or through-wall flashing is a moisture-management system installed within the wall assembly to collect and redirect water back out of the wall—typically through weeps. Since some water can get behind masonry veneer, flashing is critical to preventing that moisture from soaking into the structure and causing long-term deterioration.
How do you know if missing or failed flashing is the reason a wall keeps leaking?
Chronic leaks—especially around shelf angles, lintels, parapets, and wall transitions—often point to failed, short, or missing flashing, or drainage pathways that were blocked or never installed (like weeps). We evaluate how the wall is built and where moisture is escaping (or trapped), then recommend flashing and weep solutions that address the cause—not just the interior symptoms.
Can thru-wall flashing be installed on an existing building, or only during new construction?
Yes, it can be retrofitted. In many cases, installing or repairing thru-wall flashing requires selectively removing sections of exterior masonry to access the wall assembly, then integrating new flashing and drainage components so the system can actually discharge moisture properly.
