What is chimney flashing and cricket?
Chimney flashing is the metal seal around a chimney where it meets the roof, while a cricket is a small peaked structure behind the chimney that diverts rainwater around it.
Where a chimney meets the roof, water naturally collects and seeks entry into the home. Chimney flashing and a cricket are the two main defenses against this intrusion.
Flashing consists of bent metal pieces (typically aluminum or galvanized steel) installed in layers around the chimney base. Step flashing runs up the roof slope in a series of overlapping steps, with each section tucked under the roof shingles. Counter-flashing is a separate metal strip installed into the chimney mortar joint itself, then overlapped on top of the step flashing. This dual arrangement ensures water runs outward and downward, away from the chimney interior.
A cricket (also called a flashing saddle) is a small peaked roof structure built directly behind the chimney on the uphill side. This triangular form sheds water to both sides, preventing pooling and directing flow around the chimney entirely. Crickets are especially important on low-slope roofs or where chimneys are wide, since water has more time to accumulate.
Both components require proper installation to function. Gaps in the seal, deteriorated sealant, rusted metal, or missing counter-flashing are common failure points that allow leaks into the attic and walls. Connecticut's seasonal freeze-thaw cycles make regular inspection and maintenance critical. Connecticut roof repair contractors regularly address flashing and cricket failures as part of leak prevention and chimney waterproofing work.