A roof cricket is a small raised structure built on the uphill side of a chimney, skylight, roof curb, or other wide roof penetration. Its purpose is to split and redirect water around the obstruction so rain and melting snow can continue toward the roof drainage path.
For homeowners in Greene, NY, a cricket can be especially useful because roofs must manage heavy rain, freeze-thaw cycles, and periods of snow accumulation. Although a cricket may not be visible from the ground, it can play a major role in preventing leaks around one of the most vulnerable areas of a roof.
What does a roof cricket look like?
A cricket usually looks like a narrow, peaked ridge or wedge behind a chimney. It is framed above the roof deck and covered with roofing material, sheet metal, or both. The raised center directs water toward sloped channels on either side.
The shape is similar to a small roof built on top of the main roof. It may be:
- A peaked structure behind a chimney
- A sloped saddle around a skylight or roof penetration
- A tapered drainage structure on a low-slope roof
- A built-up section covered with shingles, membrane roofing, or metal
A cricket is different from flashing, although the two work together. Flashing seals the joint where the roof meets the chimney or penetration. The cricket moves water away from that joint before it can collect there.
Why is a roof cricket important?
A cricket prevents water from pooling behind a wide obstruction. Without one, a chimney or large roof penetration can act like a dam. Water flowing down the roof reaches the obstruction, slows down, and may remain concentrated along the uphill side.
That trapped water can contribute to:
- Deteriorated shingles or membrane roofing
- Rusted or separated flashing
- Rot in roof sheathing
- Wet insulation
- Staining on ceilings and upper walls
- Leaks that appear far from the actual problem
A cricket also helps manage snow. In cold weather, snow can accumulate behind a chimney and remain there after other portions of the roof have cleared. Repeated melting and refreezing can place additional stress on flashing and roofing materials. A properly designed cricket reduces the amount of water and ice held against the uphill side of the obstruction.
Where are roof crickets commonly used?
The most familiar location is behind a masonry chimney, but crickets can be used in several situations. They are most helpful when an obstruction is wide enough to interrupt normal water flow.
Common examples include:
- Chimneys
- Wide skylights
- Large plumbing or mechanical curbs
- Roof-mounted equipment
- Raised wall sections
- Portions of a roof where drainage is divided or redirected
New York State residential code includes requirements for crickets or saddles on the ridge side of chimneys and other penetrations wider than 30 inches, measured across the roof slope. Existing homes may have been built under earlier requirements, and the exact application can depend on the type of work being performed and the building code in effect at the time.
Is a cricket the same as a chimney saddle?
The terms are often used interchangeably. In roofing discussions, “cricket” and “saddle” generally describe a raised, sloped structure that diverts water around an obstruction.
Some roofers use “cricket” for a peaked structure with a center ridge. Others use “saddle” as a broader term for a drainage shape behind a chimney or around another penetration. The function is essentially the same: prevent water from sitting against the uphill side of the obstruction.
What happens if a chimney has no cricket?
A chimney does not automatically leak simply because it lacks a cricket. Smaller chimneys on steeply sloped roofs may shed water effectively with properly installed step flashing, counterflashing, and a carefully formed back-pan detail.
However, a wide chimney on a low-slope or moderately sloped roof is more likely to create a drainage problem. Without a cricket, water and snow can collect behind it, particularly during prolonged storms or repeated freeze-thaw conditions.
Warning signs may include:
- Water stains near a chimney or upper-story wall
- Damp or soft roof sheathing visible from an attic
- Moss or heavy debris buildup behind the chimney
- Loose, cracked, or rusted flashing
- Repeated interior leaks after snow or wind-driven rain
- Ice buildup concentrated on one side of the chimney
A leak may not appear directly below the cricket or chimney. Water can travel along roof decking, rafters, insulation, or interior framing before becoming visible.
How is a roof cricket built?
A typical cricket begins with a framed support attached to the roof structure. The framing creates a raised centerline and sloping sides. The shape must be integrated with the existing roof slope so water has a clear path around the obstruction.
The completed structure generally includes:
1. A solid structural base
2. Roof sheathing or another suitable deck surface
3. Underlayment or water-resistant protection
4. Flashing at the chimney or penetration
5. Roofing material that ties into the surrounding roof
6. Counterflashing or other upper-edge protection where required
The cricket should not be treated as a decorative cap placed over a leak. If the underlying roof deck, chimney masonry, or flashing is damaged, adding surface material alone may leave the original problem unresolved.
What materials are used?
The material depends on the roof covering and the design of the cricket. Asphalt-shingle roofs may use shingles over the sloped sides, combined with metal flashing at critical transitions. Low-slope roofs may use membrane materials, formed metal, or a combination of membrane and metal components.
A cricket’s covering must be compatible with the surrounding roof. The transitions are often more important than the visible surface. Even a well-shaped cricket can fail if flashing is poorly lapped, fasteners are exposed in the wrong locations, or counterflashing does not adequately protect the upper edge.
Can a roof cricket be added to an existing roof?
In many cases, a cricket can be added during a roof replacement or major repair. The work usually requires removing roofing around the chimney or penetration, evaluating the roof deck, constructing the raised form, and integrating new flashing with the existing wall or masonry.
Adding one during reroofing is often more practical than attempting the work after new roofing has been installed. The final design should account for roof pitch, chimney width, snow conditions, drainage, roofing material, and the condition of the masonry or other penetration.
Any work that changes the roof structure or involves regulated construction may require permit review. Greene residents should verify current requirements with the applicable building-code office before construction begins, particularly when a roof replacement or structural alteration is involved.
What should homeowners look for during a roof inspection?
From the ground, the cricket itself may be difficult to see. Binoculars can help, but climbing onto a roof is hazardous, especially when shingles are wet, icy, steep, or covered with debris.
A visual inspection from a safe location can look for:
- Water staining near the chimney or skylight
- Sagging roof areas behind a penetration
- Missing or damaged flashing
- Exposed underlayment
- Debris collecting in a drainage channel
- Excessive moss growth or persistent dampness
- Interior stains that worsen after rain or snowmelt
If a leak is active, electrical fixtures, attic insulation, and ceiling materials can create additional safety concerns. The source should be identified before interior repairs are made, because covering a stain does not correct the roof drainage problem.
A roof cricket is a relatively small part of a roofing system, but it performs a critical job. By dividing water and reducing snow accumulation behind wide penetrations, it helps protect flashing, roof decking, insulation, and interior finishes. In a climate with snow, rain, and repeated freezing and thawing, that drainage detail can make a meaningful difference in the long-term performance of a roof.
