How Weather Affects Parapet Walls and What You Can Do About It
Parapet walls serve as protective barriers for buildings, but their exposure to the elements makes them highly vulnerable to weather-related damage. Understanding how weather conditions impact parapet walls and implementing preventative measures can help extend their lifespan and maintain structural integrity. Below, we explore the effects of seasonal weather on parapet walls and the best ways to protect them.
LOCAL LAW 126INSPECTIONSPARAPET INSPECTIONSNYC DOB
Parapet Pro Inspectors
4/2/20252 min read
1. The Impact of Rain and Moisture
Problem: Heavy rainfall and prolonged moisture exposure can lead to water infiltration, which weakens the masonry and mortar joints. This often results in cracks, mold growth, and structural instability.
Solution:
Regularly inspect and repoint mortar joints to prevent water penetration.
Apply waterproof sealants and coatings to protect the masonry surface.
Ensure proper flashing installation to redirect water away from the parapet.
2. Freeze-Thaw Cycle Damage
Problem: In colder climates, water seeps into small cracks and expands when it freezes. This process, known as freeze-thaw cycling, can cause bricks and concrete to crack, spall, and deteriorate over time.
Solution:
Seal cracks before winter to prevent water infiltration.
Use breathable waterproof coatings to reduce moisture absorption while allowing trapped vapor to escape.
Consider using frost-resistant bricks and masonry materials when replacing damaged sections.
3. Effects of High Temperatures and Sun Exposure
Problem: Extreme heat and direct sunlight can cause parapet materials to expand and contract, leading to cracks and weakening of the structure over time. UV exposure can also degrade certain sealants and coatings.
Solution:
Use high-quality, UV-resistant coatings to protect against sun damage.
Monitor for signs of thermal expansion cracks and address them promptly with flexible sealants.
Implement shading solutions if feasible, such as reflective coatings or vegetation.
4. Wind and Storm Damage
Problem: Strong winds and storms can put significant pressure on parapet walls, leading to loosening of bricks, coping stones, and even structural collapse in extreme cases.
Solution:
Secure coping stones with proper anchoring and mortar.
Conduct regular inspections after storms to identify and address any damage.
Reinforce parapet walls if located in high-wind areas to enhance durability.
5. Seasonal Maintenance Tips
Spring & Summer: Check for cracks, seal them, and apply protective coatings.
Fall: Clean gutters and ensure proper drainage to prepare for winter moisture.
Winter: Inspect for ice buildup and freeze-thaw damage, addressing issues promptly.
Final Thoughts
Weather can significantly impact parapet walls, but proactive maintenance can prevent costly damage. Regular inspections, proper sealing, and using weather-resistant materials will help maintain the integrity of parapet walls year-round. If you suspect weather-related damage, consulting a professional parapet inspector can ensure timely repairs and long-term protection.