For commercial buildings, a roof is much more than just a protective covering. Large industrial and commercial roofs must shield the building while supporting heavy rooftop equipment critical to operations. To handle this extra hardware, many commercial roofs are outfitted with one or several roof curbs.
What Is a Roof Curb?
A roof curb is an elevated platform on a roof that supports equipment or accommodates a roof penetration. Since roof curbs are part of the roofing system, they must effectively prevent moisture and debris intrusion while serving as a stable anchor point for equipment.
Most commercial buildings need some type of roof curb. Roof curbs are commonly used to support HVAC units, exhaust fans, vents, and skylights. Each type of equipment requires a specific kind of curb, and it’s essential to consider the roofing materials when selecting or designing a curb.
Roof Curb Installation Best Practices
Installing rooftop equipment and roof curb systems typically involves multiple specialists. While general contractors and mechanical contractors may handle equipment logistics and install the penetrations, the roofing contractor is crucial to maintaining roof integrity.
Here are some tips to avoid common pitfalls:
- Avoid last-minute changes. Typically, if the project is pre-planned and budgeted, all work goes smoothly. However, any last-minute additions or changes may not allow your roofing company the proper time to prepare or have the right materials on hand.
- Maintain sequence. A mechanical contractor (or whoever is installing the penetrations) cannot work ahead of the roofing contractor. Cutting a roof open multiple times does not take much time, but properly repairing and ensuring a watertight seal is detailed work that takes longer. To ensure that the roof is watertight, it is imperative that your contractor only open up as much of the roof as they can confidently put back in the same day.
- Use custom-fabricated roof curbs. To ensure the continued safety and functionality of the roof, it’s best to use a fully-welded and assembled custom roof curb. Though this may cost more upfront, a custom roof curb improves longevity and protects your investment in the roof and all rooftop equipment. Finding a roofer with its own in-house fabrication department is the most cost-effective way to get a quality product.
Waterproofing and Insulating Roof Curbs
Waterproofing and insulation are essential to the long-term performance of roof curbs. Without proper sealing, buildings are vulnerable to leaks, structural damage, and energy loss. To avoid these issues, it’s crucial to involve a professional roofing contractor early in the design and budgeting process.
Coordination between the roofing and mechanical contractors is also key, particularly when determining who is responsible for cutting the roof versus the roof deck. The roofing contractor should handle the flashing of all penetrations to ensure the installation meets warranty and industry standards. Skipping these steps or leaving them to chance can compromise the roof system and potentially void manufacturer warranties.
Roof Curb Maintenance and Inspection Checklist
To extend the life of your roof curbs and prevent costly repairs, follow this proactive maintenance routine:
Post-Installation Inspection
Have a roofing professional inspect all corners and flashing points immediately after installation to ensure a watertight seal.
Annual Roof System Inspection
Schedule a comprehensive inspection of the entire roof system each year, including roof curbs, penetrations, and flashing.
Post-Contractor Visual Checks
After any third-party contractors have accessed the roof, perform a brief visual inspection to identify signs of accidental damage or disruption.
Regular maintenance not only preserves your investment but also helps ensure your roof system remains compliant with manufacturer warranties.
Protect Your Investment
When installed and maintained correctly, roof curbs play a vital role in the performance of your building. To support critical equipment and preserve your roof’s integrity, proper planning, installation, and care are essential.
Maxwell Roofing & Sheet Metal, Inc. has the expertise to ensure that your roof curbs are properly installed to protect your roof, your equipment, and your budget.
Contact us today to learn more about our roof curb solutions.