Rooftop cooling towers are critical infrastructure for commercial and industrial buildings, but replacing or upgrading them in Florida's high-wind environment requires careful engineering. From anchorage design to wind load verification, our team delivers PE-sealed packages that satisfy building departments and protect the investment.
The Challenge of Rooftop Cooling Tower Replacements
When a cooling tower reaches the end of its service life, the replacement unit rarely matches the original's footprint, weight, or structural configuration exactly. New models may be taller, lighter, or differently shaped — all of which change the wind load profile. Building officials in Florida rightly require updated engineering to verify that the roof structure, support framing, and anchorage can handle the new unit under current code wind speeds.
This is especially important because wind codes have evolved significantly. A cooling tower originally installed under the 2001 FBC may have been designed for much lower wind speeds than what ASCE 7-22 and FBC 2023 now require. The replacement must meet today's standards, not yesterday's.
Our Engineering Approach
Every cooling tower replacement project starts with gathering the manufacturer's specifications for the new unit — dimensions, operating weight, empty weight, wind-exposed area, and connection point locations. We then perform a site-specific wind load analysis per ASCE 7-22 to determine the design pressures and forces acting on the unit at its installed height.
The key parameters we evaluate include the velocity pressure at mean roof height (qh), the appropriate force coefficient (Cf) for the equipment geometry, the gust-effect factor (G), and the equipment's projected area. The resulting wind forces drive the anchorage design — how the unit is bolted to the roof curb, support steel, or structural slab.
Anchorage and Connection Design
The anchorage is often the most critical element. We design or verify bolt patterns, base plate connections, and load paths from the equipment through the curb or support frame and into the building structure. For units mounted on elevated steel dunnage, we also check the dunnage members for combined gravity and wind loading, including uplift conditions where wind suction can exceed the equipment's dead weight.
What We Deliver
Our cooling tower engineering packages typically include: wind load calculations per ASCE 7-22 with site-specific wind speed and exposure, equipment anchorage design with bolt size and pattern, connection detail drawings showing the attachment to the existing structure, verification of the existing support structure's adequacy for the new loading, and a PE-sealed calculation and drawing set ready for permit.
Estimate Your Wind Pressures
Our Roof C&C Wind Pressure Calculator can give you a quick look at the wind pressures acting on your roof — the same pressures that drive cooling tower anchorage design. For a rough check on whether your equipment's mounting can handle the loads, it's a great starting point.
Code Requirements Contractors Should Know
Under FBC 2023 Section 1609 and ASCE 7-22 Chapter 29, rooftop equipment must be designed to resist wind loads based on the building's risk category, location, and the equipment's exposure. Even "like-for-like" replacements often require new engineering because the code-level wind speeds may have increased since the original installation, the new unit's geometry differs from the old one, or the building department requires current-code compliance for any permitted work.
We work with HVAC contractors, mechanical engineers, and building owners across Florida to streamline this process. Our goal is to deliver a clean, code-compliant package that gets approved on first review.
Need a Cooling Tower Wind Analysis?
If you're planning a cooling tower replacement and need PE-sealed engineering for your permit, reach out to our team. We typically turn these around within a few business days and can coordinate directly with your mechanical contractor and the building department.