When a commercial building undergoes a roof replacement, one important consideration is the management of refrigerant line sets. These copper lines connect rooftop HVAC equipment to indoor units and carry refrigerant between the components. Because they often run across or through the existing roofing system, they must be carefully protected, supported, and repositioned during a roof replacement.
At Shieldline Roofing, proper coordination between roofing and HVAC requirements is essential to prevent damage, refrigerant leaks, and future roof problems.
What Are Refrigerant Line Sets?
Refrigerant line sets typically consist of two copper pipes: a larger suction line and a smaller liquid line. They connect air-conditioning or heat-pump equipment to the building’s indoor HVAC components.
On commercial roofs, these lines may be installed on supports, attached to equipment curbs, routed through penetrations, or positioned along rooftop pathways. Their location can become a concern when the existing roof membrane, insulation, flashing, or supports are removed.
Are Refrigerant Lines Removed During Roof Replacement?
Not necessarily. In many projects, refrigerant line sets can remain in place if they are properly supported and there is enough clearance for the roofing contractor to install the new roofing system underneath or around them.
However, some situations require temporary repositioning or removal. For example, if the lines prevent access to the existing roof surface, interfere with insulation installation, or are attached to components that must be replaced, the HVAC contractor may need to disconnect and relocate them.
Roofing and HVAC contractors should coordinate this work before construction begins. Refrigerant lines should not simply be moved or disconnected by a roofing crew that is not qualified to handle refrigerant systems.
How Are Line Sets Protected?
During roof replacement, exposed refrigerant lines need protection from construction traffic, tools, falling materials, and excessive movement. Contractors may temporarily secure or protect the lines while removing the old roofing system and installing new insulation and membrane materials.
Permanent supports are also important. Refrigerant lines should be elevated appropriately where necessary rather than resting directly on the new roof membrane. Proper support helps reduce abrasion, protects the roofing system, and allows water to drain beneath the lines.
The exact support method depends on the roof assembly, HVAC configuration, manufacturer requirements, and local building practices.
What Happens at Roof Penetrations?
If refrigerant lines pass through the roof, those penetrations require particular attention. The new roofing system must be properly flashed and sealed around the penetration to create a watertight transition.
Improperly flashed penetrations can become potential sources of roof leaks. During replacement, contractors should inspect existing penetrations and determine whether they can be reused, need new flashing, or should be relocated.
Who Handles the Refrigerant Work?
Roofing contractors generally handle the roofing membrane, insulation, flashing, and waterproofing work. HVAC contractors should handle refrigerant-related activities such as recovering refrigerant, disconnecting equipment, modifying line sets, pressure testing, evacuating the system, and recharging it when necessary.
Coordinating both trades before the project begins helps minimize HVAC downtime and prevents unnecessary damage to the new roof.
Can Refrigerant Lines Damage a New Roof?
They can if they are improperly supported, installed, or moved. Copper lines that contact roofing materials or move repeatedly because of thermal expansion, vibration, or wind can potentially cause wear over time.
For this reason, refrigerant line sets should be planned as part of the overall rooftop equipment layout—not treated as an afterthought.
The Bottom Line
During a commercial roof replacement, refrigerant line sets are usually protected in place, temporarily repositioned, or coordinated with HVAC contractors for removal and reinstallation, depending on the roof design and equipment configuration. Proper supports, flashing, clearance, and protection are essential for maintaining both HVAC performance and roof integrity.
If your Florida commercial property needs a roof replacement involving rooftop HVAC equipment and refrigerant lines, Shieldline Roofing can coordinate the roofing scope with the existing rooftop systems to help protect your investment and minimize disruption.
Related Questions
- How are rooftop units disconnected and reset during a reroof?
- How are gas lines and conduit supported without penetrating the roof?
- Which should come first: the new roof or the new rooftop units?
- How should HVAC replacement be coordinated with roof replacement?
- Which licensed trades are required for gas, electrical, and refrigerant work?
- How is rooftop electrical conduit relocated during roof work?
- How are ductwork and equipment supports raised when insulation is added?
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