A roof cricket is a raised, peaked structure built on the uphill side of a chimney or another wide roof penetration. Its purpose is to divide and redirect rainwater, melting snow, and ice so they flow around the obstruction instead of collecting against it.
For homes in Gansevoort, NY, a cricket can be especially useful because roofs must manage repeated cycles of snow, freezing temperatures, thawing, and heavy spring rainfall. Although a cricket may look like a small roof section, it plays an important role in keeping water away from one of the most vulnerable areas of a roof.
What does a roof cricket look like?
A cricket resembles a small triangular roof built behind a chimney. The ridge of the cricket usually runs perpendicular to the main roof ridge, creating sloped surfaces that direct water toward both sides of the chimney.
It is typically framed with wood and covered with roofing materials, sheet metal, or a combination of both. The cricket connects with the chimney flashing system, which must be carefully integrated with the roof covering.
A cricket is sometimes called a chimney saddle. The two terms generally describe the same type of water-diverting structure.
Why is a roof cricket needed?
A chimney or wide roof penetration interrupts the natural downhill path of water. Without a cricket, rain and melting snow traveling down the roof can strike the uphill side of the chimney and collect in a confined area.
That trapped water can contribute to:
- Deteriorated roof decking
- Leaks around the chimney
- Rot in roof framing
- Damaged insulation
- Interior ceiling stains
- Mold or musty odors caused by persistent moisture
- Ice buildup during freeze-thaw cycles
A cricket does not make the chimney itself waterproof. Instead, it improves drainage and gives the flashing system a better chance to perform properly.
This distinction matters because chimney leaks are often blamed on missing or damaged mortar, when the actual problem may be failed flashing, an undersized cricket, deteriorated roofing, or several issues working together.
Does every chimney need a cricket?
No. A cricket is not required for every chimney or roof penetration.
The need depends on the width of the obstruction, its location, the roof design, and the applicable building-code requirements. New York residential code provisions generally call for a cricket or saddle on the ridge side of a chimney or penetration that is more than 30 inches wide when measured across the roof slope.
The exact requirement can depend on the code edition adopted for a particular project and how the chimney or penetration is positioned. A chimney that reaches the roof ridge may be treated differently from one located entirely below the ridge because water may be able to pass around it more naturally.
Older homes may not have been built under the same requirements used for new construction. The absence of a cricket does not automatically mean a roof is unsafe or improperly built, but it can increase the importance of sound flashing and regular inspection.
How does a cricket help with snow and ice?
In a cold-weather area, a cricket helps manage more than rainwater. It can also reduce the amount of snow that presses directly against the uphill side of a chimney.
Snow may accumulate where the chimney blocks the roof slope. During a thaw, meltwater can move beneath surrounding snow and refreeze near flashing seams. This repeated expansion and contraction can stress metal flashing, roofing materials, sealants, and mortar joints.
A properly shaped cricket encourages water and loose snow to move around the chimney rather than remain packed behind it. It cannot prevent all snow accumulation, and it should not be treated as a substitute for safe snow management, sound roof design, or adequate structural support.
Ice dams can still form elsewhere on the roof if attic insulation, air sealing, ventilation, or roof geometry allows heat to escape unevenly.
What materials are used to build a cricket?
The structure beneath a cricket is commonly framed with lumber or built as part of the roof structure. Its exterior covering may include:
- The same shingles or other roof covering used on the surrounding roof
- Sheet metal
- Membrane roofing
- A combination of roofing material and metal flashing
The best material depends on the roof covering, slope, chimney construction, and location of the cricket. Metal is often used at transition points because it can provide durable protection where water changes direction.
The cricket covering must be integrated with step flashing, counterflashing, and other components around the chimney. Simply placing roofing material behind a chimney without properly tying the layers together can leave hidden paths for water.
What is the difference between a cricket and flashing?
A cricket is a three-dimensional roof structure that redirects water. Flashing is the water-resistant material installed at joints, edges, walls, chimneys, valleys, and other transitions.
They work together but serve different purposes.
A cricket changes the direction of water flow. Flashing seals the areas where the cricket, chimney, and roof covering meet. Even a well-designed cricket can leak if the flashing is poorly installed, damaged, or separated from the chimney.
Likewise, carefully installed flashing may still be exposed to excessive water concentration if a wide chimney has no effective cricket.
What are signs that a cricket or chimney area has a problem?
Some warning signs appear inside the home, while others can be seen from the roof or ground. Possible indicators include:
- Brown or yellow ceiling stains near the chimney
- Dampness in an attic after rain
- Peeling paint or damaged plaster
- Loose or rusted flashing
- Cracked sealant at metal joints
- Missing shingles near the chimney
- Water marks on rafters or roof decking
- Moss or algae concentrated behind the chimney
- Repeated leaks after snow melts
- Masonry deterioration near the roof line
A leak does not always appear directly below the chimney. Water can travel along roof decking, framing, insulation, or interior finishes before becoming visible.
Roof surfaces may also be slippery, and chimney areas can involve unstable masonry or concealed structural damage. A person who notices active leaking, sagging materials, exposed framing, or loose chimney components should avoid climbing onto the roof.
Can a cricket be added to an existing roof?
Often, yes, but the work involves more than attaching a small peaked form behind the chimney. The surrounding roofing usually must be opened, the structure must be properly supported, and new flashing must be layered into the existing roof system.
The design should account for:
- Chimney width and height
- Roof pitch
- Roof covering type
- Direction of water flow
- Snow accumulation patterns
- Condition of the roof decking
- Connection to existing flashing
- Whether the chimney intersects or approaches the roof ridge
Adding a cricket during reroofing may be more practical because the roof covering and flashing are already being removed in the affected area. On an older roof, hidden damage may not become apparent until the chimney flashing is opened.
What should residents look for during a roof inspection?
A useful inspection should examine the entire chimney area, not just the visible metal at the base. Look for evidence that water is being divided above the chimney and that the cricket remains securely covered.
The inspection should also consider the condition of the chimney masonry, counterflashing, step flashing, shingles, roof decking, attic framing, and interior ceiling below. After a major snow or ice event, checking the attic and upper-level ceilings for new moisture can reveal problems before they spread.
For homes in Gansevoort, seasonal inspections are particularly helpful after winter and after periods of heavy rain. The goal is not to inspect the roof constantly, but to identify small failures before repeated wetting and freezing turn them into structural damage.
