A roof cricket is a small raised structure built on the uphill side of a chimney, skylight, roof hatch, or other wide roof penetration. Its purpose is to divide and redirect water, snow, and ice so they do not collect against the obstruction.
For homes in Valatie, NY, a cricket can be especially useful because roofs must handle repeated cycles of rain, freezing temperatures, snow accumulation, and spring thaw. A properly designed cricket helps protect one of the most vulnerable areas of the roof: the transition between the roof covering and a vertical structure.
What does a roof cricket look like?
A roof cricket is usually shaped like a small peaked ridge behind the chimney or other roof penetration. The higher side faces the roof slope, while the two sloping sides guide water around the obstruction.
It may be framed with wood or engineered materials and then covered with:
- Sheet metal
- Asphalt shingles
- Membrane roofing
- Another material compatible with the surrounding roof
The cricket is not the same as flashing. The cricket creates the shape that moves water, while flashing seals the joints where the roof meets the chimney or structure. Both parts must work together.
On a pitched roof, the cricket is located on the ridge side of the obstruction. Water flowing down the roof reaches the cricket first, then separates and continues around both sides instead of backing up against the chimney.
Why is a roof cricket important?
A cricket reduces the chance of water pooling behind a chimney or wide roof opening. Without one, the uphill side of the obstruction can act like a dam, especially during heavy rain or melting snow.
That trapped moisture can contribute to:
- Deteriorated roof sheathing
- Wet attic insulation
- Staining on ceilings or upper walls
- Rot in framing near the chimney
- Rusted or separated flashing
- Repeated leaks that are difficult to trace
Snow and ice can make the problem worse. In winter, a drift may form behind a chimney and remain there longer than snow on the surrounding roof. During a thaw, the meltwater may flow toward small gaps in the flashing or roofing system. If the water refreezes at night, expanding ice can gradually loosen materials or widen weak points.
A cricket does not make a roof leak-proof by itself. Its value comes from improving drainage and reducing the amount of water and snow pressing against the flashing assembly.
Which roof penetrations need a cricket?
The need for a cricket depends mainly on the width and shape of the obstruction, the roof design, and the applicable building code.
Under the Residential Code of New York State, a cricket or saddle is generally required on the ridge side of a chimney or roof penetration more than 30 inches wide when measured perpendicular to the roof slope. The cricket covering must be made from sheet metal or a compatible roof-covering material.
That measurement is not the only consideration. A smaller chimney may still benefit from a properly formed back-pan flashing or another drainage detail, particularly on a low-slope roof or where snow tends to accumulate. Larger chimneys, broad skylights, masonry features, and roof equipment are more likely to require a clearly visible cricket.
Existing homes can present additional questions. A roof built under an older code may not have the same design features required for new construction or certain replacement work. Whether a cricket is required during a roof replacement can depend on the scope of the work, local enforcement, the current code edition, and the condition of the existing roof structure.
How does a cricket differ from flashing?
Flashing is a weather-resistant material installed at roof transitions and joints. Around a chimney, this may include step flashing along the sides, apron flashing at the lower edge, and counterflashing cut into or attached to the masonry.
A cricket is a raised drainage structure. It changes the way water moves before that water reaches the chimney flashing.
The two systems are connected. The intersection between the cricket and chimney must be flashed and counterflashed carefully. If the cricket is framed correctly but the flashing is incomplete, leaks can still occur. Likewise, excellent flashing may be overwhelmed if a wide chimney creates a large area where water and snow collect.
What happens when a cricket is missing or poorly built?
A missing cricket is not always the immediate cause of a leak, but it can create conditions that make leakage more likely. Common warning signs include water stains on the ceiling below a chimney, damp insulation near the chimney, cracked masonry joints, or repeated repairs to the same section of flashing.
A poorly built cricket may create different problems:
- The slope may be too shallow to drain effectively.
- The ridge may end too close to the chimney.
- The structure may not be wide enough to divide water.
- Fasteners may be exposed or improperly sealed.
- Metal may be installed without allowing for movement.
- Roofing materials may be lapped in the wrong direction.
- Ice and debris may collect at the sides.
A cricket should be integrated into the roof assembly rather than placed on top as a decorative bump. Its framing, underlayment, flashing, and roof covering all need to direct water toward the intended drainage paths.
Why are crickets especially useful in snowy climates?
In a snow-prone climate, the uphill side of a chimney can become a natural collection point. The chimney interrupts the smooth slope of the roof, and wind can deposit additional snow around the obstruction.
A cricket helps divide that accumulation and provides a sloped surface for water to drain during warmer periods. It also reduces the size of the nearly flat area where ice dams can develop.
However, a cricket does not replace proper attic insulation, air sealing, ventilation, or safe snow management. Heat escaping into the attic can warm the underside of the roof and contribute to uneven snow melting. The resulting water may refreeze near colder eaves or around roof details. Good roof drainage depends on the entire assembly, not only on one feature behind a chimney.
Can a homeowner tell whether a cricket is present?
From the ground, a cricket may be visible as a small peak or raised ridge behind the chimney. On some roofs, it is covered with shingles and blends into the slope. On others, sheet metal makes the shape easier to identify.
A ground-level inspection may reveal:
- Snow or leaves collecting behind a chimney
- Bent or displaced flashing
- Rusted metal
- Missing shingles near the upper chimney edge
- Dark staining on masonry
- Sagging roof materials
- Water marks inside the attic
Walking on a snow-covered, icy, or steep roof is hazardous. A safer inspection point is often the attic, where daylight, damp wood, staining, or deteriorated insulation may show that water is entering near the chimney or roof penetration.
When should a cricket be evaluated?
A cricket deserves closer attention when a roof is being replaced, a chimney is rebuilt, a wide skylight is installed, or a recurring leak appears near a roof penetration. It is also worth reviewing after major storm damage or when flashing has been repaired more than once.
The relevant questions are whether the roof has an effective drainage shape, whether the flashing is correctly layered, whether materials remain sound, and whether the work meets the code requirements that apply to the project.
A roof cricket is a relatively small part of a roofing system, but it serves a practical purpose. By guiding water, snow, and ice around a chimney or other obstruction, it helps reduce stress on the flashing and lowers the chance that moisture will enter the roof assembly.
