Which option best describes a method to reduce water intrusion in tilt-up panels?

• A. Blowing out openings in the panel
• B. Waterproof coatings on the exterior are the only solution
• C. Sealing the exterior without opening the panel
• D. Drainage is not necessary for tilt-up panels

Answer: (A)

Water intrusion is driven by water that gets behind panels and builds up pressure against joints. The most effective way to reduce that intrusion is to provide a controlled path for water to escape and air to vent, so moisture doesn’t get trapped behind the panel. Creating openings that allow drainage and venting—often as weep or vent openings at appropriate locations—relieves hydrostatic pressure and lets any moisture exit to the exterior. Exterior coatings or sealants help, but they don’t solve drainage and pressure issues by themselves, and sealing the exterior without providing drainage can actually trap moisture behind the panel. Treating drainage and ventilation as part of the panel detailing is therefore the best approach to minimize water intrusion.