Expansion joints on a Bermuda type roof should be used at least every how many feet?

Expansion joints on a Bermuda type roof should be used at least every how many feet?

• A. 15 feet
• B. 20 feet
• C. 25 feet
• D. 30 feet

Answer: (C)

Expansion joints are added to long roof runs to relieve movement from temperature changes and structural shifts, preventing tiles from cracking or flashing from opening. Bermuda tile roofs are relatively rigid and span substantial lengths, so regular joints are needed to accommodate the expansion and contraction that Florida’s hot days cause. Placing expansion joints at about 25 feet or more frequently along straight runs—and at transitions, hips, ridges, and around penetrations like chimneys or vents—helps localize movement to a controlled area and keeps the roof watertight. The joints should be properly flashed and sealed to maintain a weatherproof seam, with flashing and tile work designed to handle the movement the joint allows.

Expansion joints are added to long roof runs to relieve movement from temperature changes and structural shifts, preventing tiles from cracking or flashing from opening. Bermuda tile roofs are relatively rigid and span substantial lengths, so regular joints are needed to accommodate the expansion and contraction that Florida’s hot days cause. Placing expansion joints at about 25 feet or more frequently along straight runs—and at transitions, hips, ridges, and around penetrations like chimneys or vents—helps localize movement to a controlled area and keeps the roof watertight. The joints should be properly flashed and sealed to maintain a weatherproof seam, with flashing and tile work designed to handle the movement the joint allows.