Philadelphia experiences an average of 60 freeze-thaw cycles each winter, which is higher than cities to the south and creates unique stress on roof structures. When water pools behind a chimney due to improper cricket pitch, it freezes overnight and expands. This expansion lifts shingles, cracks sealant, and opens gaps in the flashing. During the day, the ice melts and water seeps through the gaps into the attic. The cycle repeats every night, causing progressive damage. A properly pitched cricket eliminates pooling, so there is no water to freeze. This is why cricket drainage issues are more destructive in Philadelphia than in warmer climates.
Philadelphia's roofing contractors are familiar with the city's older housing stock and the common shortcuts taken during mid-century renovations. Many rowhomes and twins in neighborhoods like Port Richmond, Kensington, and Manayunk have chimneys that were added after the original roof framing. These retrofits often lacked proper cricket installation because contractors prioritized speed over long-term performance. Atlas Roofing Philadelphia has repaired hundreds of these chimneys and understands the framing limitations and flashing techniques required to fix them permanently. We work within the constraints of older construction while meeting current code standards for water management and structural integrity.