Roof Cricket Installation: Complete Guide to Design, Materials, and Installation in 2026

A roof cricket installation is an important roofing solution used to redirect rainwater and reduce the risk of water pooling around chimneys, skylights, walls, curbs, and other roof penetrations. Although a cricket is relatively small compared with the overall roof, its design and installation can have a major effect on roof drainage and long-term waterproofing.

When properly designed, a roof cricket divides water flow and directs it toward drainage paths instead of allowing water to collect behind an obstruction. Poorly installed crickets, on the other hand, can create additional leak points if the slope, flashing, membrane, or transitions are not properly constructed.

Whether we are planning a new roof, replacing an existing roof, or addressing recurring drainage problems, understanding roof cricket installation helps us make better decisions about materials, dimensions, flashing, and workmanship.

What Is a Roof Cricket and Why Is It Installed?

A roof cricket is a raised, sloped structure installed on the high side of a roof obstruction. Its primary purpose is to split and redirect water around the obstruction so that rainwater can continue toward drains, gutters, or roof edges.

Crickets are commonly installed behind:

• Chimneys
• Skylights
• Large rooftop curbs
• HVAC equipment
• Roof vents
• Other wide penetrations or obstructions

Without an appropriately designed cricket, water can accumulate on the uphill side of an obstruction. Standing water increases the amount of time moisture remains against roofing materials and flashing. In cold climates, repeated freezing and thawing can create additional stress on roofing components.

A cricket is not simply a decorative roof structure. It is part of the roof’s drainage and water-management system.

The exact size and slope depend on the roof design, obstruction, roofing system, climate, and applicable building requirements. For larger commercial roofs, cricket design may also be influenced by drainage calculations and the requirements of the roofing assembly.

How to Design a Roof Cricket Before Installation

Successful roof cricket installation starts with proper design. Before construction begins, we need to determine how water currently flows across the roof and where it needs to go after encountering the obstruction.

The cricket should create positive drainage away from the obstruction. Its geometry should be coordinated with the existing roof slope rather than treated as an isolated structure.

Several factors should be considered:

Cricket Width and Height

The cricket must be large enough to effectively redirect water. A very small or poorly proportioned cricket may not provide adequate drainage, particularly behind a wide chimney or curb.

Roof Slope

The existing roof pitch affects how the cricket should be constructed. The cricket’s slopes need to work with the surrounding roof so water is directed toward an appropriate drainage point.

Obstruction Size

A narrow chimney may require a relatively compact cricket, while a broad commercial curb or large rooftop unit can require a substantially larger drainage structure.

Roofing Material

The design must be compatible with the roofing system. Asphalt shingles, metal roofing, modified bitumen, built-up roofing, and single-ply membranes each have different flashing and waterproofing requirements.

Local Building Requirements

We should always check applicable building codes, manufacturer instructions, and roofing-system requirements before finalizing the design. In many cases, professional design or installation is appropriate, particularly for complex commercial roofs.

Materials Used for Roof Cricket Installation

A roof cricket can be constructed from several materials depending on the roofing assembly.

For many residential applications, the underlying structure may be formed using wood framing and roof sheathing, followed by appropriate underlayment and roofing materials. The finished cricket should integrate seamlessly with the surrounding roof.

Common components include:

• Structural framing
• Roof sheathing
• Underlayment
• Ice and water protection where required
• Metal flashing
• Counterflashing
• Roofing membrane or shingles
• Sealants compatible with the roofing system
• Fasteners appropriate for the application

For low-slope commercial roofs, crickets may be built using tapered insulation or other approved roof-forming materials. The roofing membrane is then installed over the completed slope according to the system manufacturer’s specifications.

The choice of materials is important because the cricket becomes part of the roof envelope. Mixing incompatible materials or relying excessively on sealant can create problems later.

Step-by-Step Roof Cricket Installation

The installation process varies according to the roofing system, but a typical project follows several fundamental stages.

1. Inspect the Existing Roof

We first inspect the roof, obstruction, existing flashing, drainage paths, and roofing materials. If there is existing water damage, deteriorated decking, or structural damage, those issues should be addressed before installing the new cricket.

2. Determine the Drainage Direction

The cricket should be positioned and shaped so that water is directed around the obstruction toward the roof’s existing drainage system.

3. Build the Cricket Structure

For a framed cricket, the structure is constructed to create the required slopes. The framing must be securely attached and capable of supporting the roofing assembly.

4. Install the Decking or Forming Material

Roof sheathing or approved tapered materials are installed over the structure. The surface should be stable, properly supported, and free from conditions that could compromise the finished roofing system.

5. Install Underlayment and Waterproofing

Appropriate underlayment or membrane protection is installed according to the roofing manufacturer’s requirements. Special attention should be given to transitions and areas where the cricket meets the obstruction.

6. Install Flashing

Flashing is one of the most critical parts of a cricket installation. It must be integrated with the surrounding roof and obstruction flashing so water cannot enter behind the roofing materials.

7. Install the Finished Roofing

The shingles, metal panels, membrane, or other roofing material are installed over the cricket. The installation should maintain proper water-shedding patterns and manufacturer-required overlaps.

8. Inspect the Completed Work

Finally, we inspect the cricket for gaps, improper flashing, exposed fasteners, drainage problems, damaged roofing, and other potential sources of water intrusion.

Common Roof Cricket Installation Mistakes to Avoid

Even a well-designed cricket can fail if installation details are overlooked.

One common mistake is creating insufficient slope. A cricket needs enough elevation and geometry to move water away from the obstruction effectively.

Another problem is inadequate flashing. Roofing materials alone cannot compensate for poorly integrated flashing around chimneys and penetrations.

We should also avoid depending entirely on caulk or roofing cement as a waterproofing strategy. Sealants can deteriorate over time and should generally complement—not replace—proper mechanical flashing and membrane details.

Other mistakes include:

• Blocking existing drainage paths
• Using incompatible roofing materials
• Failing to repair damaged decking
• Installing flashing incorrectly
• Leaving exposed fasteners where they are not appropriate
• Creating abrupt transitions
• Ignoring manufacturer installation requirements
• Failing to inspect the completed drainage path

A cricket should be considered part of the complete roof system, not a separate patch added after the roof is finished.

Roof Cricket vs. Saddle: Are They the Same?

The terms roof cricket and roof saddle are sometimes used interchangeably, but terminology can vary depending on the roofing industry and region.

Generally, both describe a raised structure designed to divert water around a roof obstruction. In many applications, a cricket specifically refers to the sloped structure installed on the high side of an obstruction, while “saddle” can be used more broadly.

The most important issue is not the terminology but whether the structure provides effective drainage and is properly integrated with the roofing and flashing system.

For complicated projects, we should use the terminology and construction details specified by the applicable code, roofing manufacturer, architect, or roofing professional.

Roof Cricket Maintenance and Signs of Failure

Once installed, a cricket should be inspected as part of routine roof maintenance. We should look for ponding water, damaged flashing, cracked sealants, loose roofing materials, deteriorated membrane, and signs of interior water intrusion.

Warning signs can include:

• Water stains around the chimney or skylight
• Recurring leaks after heavy rain
• Ponding behind the obstruction
• Damaged or displaced flashing
• Cracked roofing materials
• Visible deterioration around transitions
• Moisture or deterioration of roof decking

Early inspection can help identify problems before they spread into insulation, decking, framing, ceilings, or interior finishes.

For a roof with recurring leaks around an obstruction, simply adding more sealant may not solve the underlying drainage or flashing problem. We should investigate the entire cricket and flashing assembly.

Final Thoughts on Roof Cricket Installation

A properly executed roof cricket installation provides an effective way to manage water around chimneys, skylights, curbs, and other roof obstructions. The most important elements are adequate slope, correct drainage, durable materials, properly integrated flashing, and compliance with roofing-system requirements.

Rather than focusing only on the visible structure, we should treat the cricket as an integrated component of the entire roof assembly. Careful design and professional-quality installation can reduce water accumulation and help protect the roof from premature moisture-related damage.

For complex roofs, low-slope commercial systems, major structural modifications, or persistent leaks, professional evaluation is especially important. A properly designed cricket is a relatively small investment compared with the potential cost of repairing extensive roof, insulation, decking, or interior water damage.