What is a roof cricket?
A roof cricket is a small, peaked 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 instead of allowing water, snow, and ice to collect behind it.
In Greene, NY, this detail can be especially useful because roofs must manage repeated cycles of rain, snowfall, freezing temperatures, and spring thaw. A cricket is not a decorative feature. It is part of the roof’s drainage system.
A cricket is sometimes called a roof saddle. The two terms generally describe the same type of raised, sloped structure.
Why does a roof need a cricket?
Without a cricket, a large chimney or similar obstruction interrupts the roof’s natural drainage path. Water flowing down the roof reaches the uphill side of the obstruction and slows down or spreads sideways. During heavy rain, that area may receive more water than the surrounding roof.
A cricket creates a peaked transition that divides the flow. Water is directed around both sides of the obstruction and back onto the main roof surface.
This helps reduce:
- Ponding and slow drainage
- Debris accumulation
- Ice buildup behind the obstruction
- Stress on flashing and roofing materials
- The risk of leaks at the uphill chimney area
The cricket does not replace flashing. It works with properly installed step flashing, counterflashing, underlayment, and roof covering.
Where are roof crickets commonly used?
Chimneys are the most familiar location, especially masonry chimneys that are wider across the roof than a typical plumbing vent or small skylight.
Crickets may also be used behind:
- Wide skylights
- Large roof vents
- HVAC curbs on low-slope roofs
- Dormers or raised wall sections
- Other penetrations that interrupt water flow
The need depends on the size, shape, location, and roof design. A narrow penetration may be handled with properly designed flashing alone. A wide obstruction creates a larger area where water and snow can accumulate.
Many building-code provisions require a cricket or saddle on the ridge side of a chimney or other penetration wider than 30 inches when measured across the roof slope. Local code enforcement and the adopted code edition determine how the rule applies to a particular property.
What does a chimney cricket look like?
Viewed from above, a cricket resembles a small peaked roof attached to the main roof behind the chimney. Its ridge runs toward the chimney, while its sloped sides guide water to the left and right.
Viewed from the side, it appears as a raised wedge that begins higher on the roof and slopes down toward the surrounding roof surface.
A properly built cricket generally includes:
- Structural framing or a formed roof assembly
- A continuous, weather-resistant surface
- Flashing where the cricket meets the chimney
- Flashing where the cricket meets the roof
- Roofing material compatible with the surrounding roof
- Adequate slope for water and snow movement
The exact dimensions depend on the chimney width, roof pitch, roof covering, and site conditions. A cricket that is too low or poorly integrated may not provide meaningful drainage improvement.
Why are crickets useful in snowy climates?
Snow does not flow like rain. It can remain behind a chimney for weeks, melt during warmer periods, refreeze overnight, and place added pressure on flashing joints. This repeated movement can expose weak points that may not leak during ordinary rainfall.
In Greene, NY, winter precipitation commonly includes snow, freezing rain, and thawing conditions. A cricket helps prevent the uphill side of a chimney from becoming a recessed pocket where snow and meltwater remain trapped.
It does not eliminate ice dams or guarantee that a roof will remain leak-free. Roof insulation, air sealing, ventilation, flashing condition, roof pitch, and snow accumulation all affect winter performance. The cricket addresses one specific drainage problem: water and snow obstructed by a raised roof penetration.
Is a cricket the same as flashing?
No. A cricket and flashing perform different jobs.
The cricket changes the shape of the roof so water can move around the obstruction. Flashing seals the joints where different materials meet, such as the roof covering and chimney masonry.
A chimney may have a well-built cricket but still leak if the flashing is damaged, undersized, corroded, improperly lapped, or sealed with materials that have deteriorated. Conversely, excellent flashing may still face difficult conditions if a wide chimney traps water and snow because no cricket is present.
The drainage shape and the waterproof joints must work together.
What signs may suggest a cricket or drainage problem?
A roof cricket is not always visible from the ground, particularly when it is covered with shingles or metal roofing. Problems in this area may appear as:
- Water stains on ceilings or upper walls near a chimney
- Damp insulation in the attic
- Peeling paint or damaged plaster around the chimney
- Rusted metal components near the chimney base
- Moss, leaves, or sediment collecting behind the obstruction
- Shingle deterioration on the uphill side of the chimney
- Repeated leaks after wind-driven rain or snowmelt
- Ice forming heavily on one side of the chimney
A leak appearing near a chimney does not automatically mean the cricket is missing. The source may be the chimney cap, masonry joints, counterflashing, step flashing, roof underlayment, or an unrelated roof area. Water can travel along framing before becoming visible indoors.
Can a cricket be added to an existing roof?
Often, yes, but adding one to an existing roof is more involved than attaching a small metal piece behind a chimney. The surrounding roof covering usually must be opened so the new structure, underlayment, and flashing can be integrated correctly.
The work may be considered during:
- A full roof replacement
- Chimney rebuilding or repair
- Replacement of failing chimney flashing
- Installation of a large skylight or roof curb
- Correction of recurring water intrusion
The roof pitch, chimney construction, roofing material, and available space all affect the design. Masonry chimneys also require careful detailing because the joint between masonry and metal flashing must allow for movement without relying solely on surface sealant.
What should property owners look for during a roof inspection?
From the ground, look for visible evidence that water can drain around the uphill side of a chimney or large penetration. Binoculars may help, but climbing onto a roof is risky, especially when surfaces are wet, icy, steep, or covered with loose granules.
An inspection should consider:
- Whether the obstruction is wide enough to require a cricket under the applicable code
- Whether the roof surface slopes away from the chimney
- Whether flashing is continuous and properly layered
- Whether debris or snow routinely collects behind the obstruction
- Whether there are interior signs of moisture
- Whether the cricket covering matches the roof system and remains secure
Roof crickets are small compared with the rest of a roof, but they solve a specific and recurring drainage problem. On homes exposed to heavy rain, snow accumulation, and freeze-thaw cycles, that small raised structure can make the area behind a chimney far easier for the roof to manage.
