TL;DR
A New York City apartment electrification retrofit placed all outdoor heat pump units on the roof, which created a major need for reliable lineset insulation & UV protection against weather, UV exposure, and rooftop foot traffic.
VRF Solutions selected Inaba Denko Slimduct RD metal rooftop lineset protection to shield refrigerant piping and control wiring and to keep the rooftop layout clean and serviceable. Marketair supported the project with site visits, exact part planning, and crew training. They now plan to scope Slimduct RD and PD on future rooftop projects.
Inaba Denko America’s lineset protection solutions played a key role in a retrofit HVAC project in a New York City apartment building. The project team wanted to install individual heat pump systems for each apartment.
Each system needed to connect to the tenant’s own electric meter. This design gave each resident direct control over comfort and energy use. It also supported building electrification goals without forcing every unit into a central system.
This level of heating and cooling independence is uncommon in New York City. The project team faced a key constraint. The building layout and available space required the contractor to place all outdoor heat pump units on the roof. That choice drove the rest of the design.
It also raised a critical question:
“How do you protect dozens of refrigerant lines and control cables as they run across a busy rooftop?”
VRF Solutions served as the design-build mechanical contractor for the retrofit. They needed an approach that supported speed, durability, and service access. The team also needed a solution that looked professional on a visible rooftop and stayed reliable through years of harsh weather.
The Challenge: Rooftop Lineset Protection
The roof created risks for every run of refrigerant piping and wiring.
The first risk came from weather exposure. In New York:
- Rooftops see constant sun, wind, rain, snow, and ice.
- UV radiation can break down the outer skin of typical insulation.
- Moisture can enter damaged insulation.
- Temperature swings can accelerate cracking and shrinking.
- Over time, degraded insulation reduces system efficiency and increases the chance of service issues.
The second risk came from people. Rooftops in New York City often serve as work zones, which means technicians walk the roof for HVAC service, roof repairs, and general building maintenance. Foot traffic and tools can crush insulated copper, tear jacketing, or snag control wiring. A single damaged section can reduce performance or cause a failure that is hard to trace.
The contractor needed a product that provided solid line-set protection on the roof. They also wanted strong lineset insulation & UV protection. The system had to shield the insulation from sunlight and the copper and controls from impact. AT the same time, the installation path had to stay clean.
The Solution: Slimduct RD Lineset Protection by Inaba Denko
VRF Solutions selected our Slimduct RD metal lineset cover for the rooftop runs. It’s a metal lineset protection cover system that Inaba Denko engineered for rooftop use. The system provides a rigid protective shell around insulated refrigerant piping and control wiring. It supports straight runs, direction changes, and terminations with matched fittings.
Slimduct RD solved the core rooftop problems in one package.
- The metal cover blocks UV exposure, which means effective lineset insulation & UV protection.
- The rigid profile resists impact from foot traffic and dropped tools, which provides long-term lineset protection.
- It keeps the refrigerant lines organized and serviceable, which helps technicians trace circuits and piping later.
- The finished look helps maintain the curb appeal, even with many systems installed in parallel.
VRF Solutions also valued how Slimduct RD supports repeatable planning. The team could design standard routing paths and standardize parts and labor. That consistency reduces installation variability across a large multi-unit retrofit.
“We needed something durable that could protect our linesets and our piping from not only the environment, but also people on the roof, potentially stepping on these sensitive pipes. So, we found Inaba Denko’s RD, which is just a fantastic product,” said Tom Esposito, President of VRF Solutions.
This project confirmed a practical point for electrification retrofits. Heat pump performance depends on the full refrigerant circuit, not only the equipment. Good routing and reliable lineset protection are equally critical for stable operation year after year.
Collaboration with Marketair
Project success also depended on planning support. Gerry Spanger, President and CEO of Marketair, worked with VRF Solutions through the planning and installation process. Marketair serves as the master distributor of Slimduct RD in North America.
Spanger visited the site multiple times. He helped the team map the rooftop routing. He helped the team develop a cost-focused parts plan. He also helped the team list exact quantities for each Slimduct RD component. That step reduced waste and reduced jobsite delays.
Spanger also supported field training. He worked with the installation crew so they could learn correct assembly practices. VRF Solutions also used Inaba Denko installation videos as a reference. The crew gained confidence with the system quickly.
The training created a long-term benefit. VRF Solutions now has seven additional team members trained in Slimduct RD lineset protection installation. The team has already scheduled Slimduct RD for the upcoming work. The crew now has a rooftop method that protects piping, protects controls, and maintains a clean roof layout.
Looking Ahead
The VRF Solutions team now treats rooftop lineset protection as a standard design element, not an add-on. The team also views lineset insulation & UV protection as a system life issue, not only a finish detail. Rooftop exposure can shorten insulation life. Rooftop traffic can cause hidden damage. A protective cover helps reduce those risks.
“In the future, we have a lot of projects that are on the drawing board right now that have Inaba Denko’s RD and PD. But all of the projects going forward are going to be scoped with this material because it is important to protect these linesets from the environment, because you’re losing the life expectancy of the product,” said Esposito.
This NYC retrofit shows how the right lineset protection system supports electrification goals. Slimduct RD helped the contractor protect each apartment’s heat pump connection from environmental exposure and rooftop activity. The result gave residents more control and gave the contractor a repeatable path for future projects.
FAQs
1. Why does rooftop routing need a dedicated lineset protection?
Rooftops expose piping to UV, rain, ice, and foot traffic. A dedicated cover reduces insulation damage and impact damage. That protection supports efficiency and service life.
2. What problems can UV cause for lineset insulation?
UV can crack and degrade exposed insulation surfaces. Damage can let moisture in and reduce insulation value. Reduced insulation can increase energy loss and lead to performance issues.
3. Can Slimduct RD protect control wiring as well as refrigerant piping?
Yes, Slimduct RD encloses insulated copper lines and control wiring in one protected pathway. This design reduces snagging and physical damage during service work.
4. How does a metal rooftop cover help with maintenance?
A rigid cover creates an organized route that technicians can follow. It also shields the piping from accidental steps and tool drops during rooftop service.
5. How does planning support reduce labor and waste on a retrofit?
Accurate part counts reduce over-ordering and missed fittings. Clear routing plans reduce rework. Training helps crews install the system correctly on the first pass.
6. Is rooftop lineset protection only for large VRF systems?
No, rooftop runs exist on mini split, VRF, and unitary heat pump projects. Any exposed run can benefit from our lineset protection solutions.
