Rooftop & Mechanical Unit Flood and Water Damage Repair
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Rooftop & Mechanical Unit Flood and Water Damage Repair

Rain that gets into a rooftop unit and water that rises around a boiler or condensing unit both cause damage that is easy to miss from the outside. Mission Mechanical provides licensed rooftop and mechanical unit flood and water damage repair for plumbing, cooling, and heating equipment at commercial properties in Lawrence, Indianapolis, and surrounding central Indiana communities. Our team has served commercial properties since 2002, holds Indiana License CP 10200022, includes NATE-certified technicians, carries full general liability and workers compensation insurance, and is BBB A+ accredited. Our commercial clients consistently rate our work highly on Google and Yelp. Mission Mechanical is a MICCS safety member and an Indianapolis Colts Small Business Partner 2026. Call 317-733-8686 or request an equipment evaluation online.

Rooftop & Mechanical Unit Flood and Water Damage Repair

Mission Mechanical evaluates and repairs the equipment, its piping, its gas and refrigerant connections, and its controls. Roof membrane, flashing, and curb repairs belong to a roofing contractor. Water extraction and structural drying follow the IICRC S500 standard, and mold remediation is performed by qualified restoration contractors. We coordinate with both so equipment is not restarted or reinstalled before the water source is fixed and the space is dry. For flooding that affects an entire building, see our commercial flood damage response service.

What Rooftop and Mechanical Unit Water Damage Repair Is

This service is the evaluation, repair, and replacement of HVAC and plumbing equipment that has been wetted or submerged. It covers rooftop units, split-system condensers, air handlers, furnaces, boilers, unit heaters, water heaters, pumps, and the piping, gas, refrigerant, and control connections that serve them.

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Water reaches this equipment in two ways. From above, wind-driven rain, failed seals, clogged condensate drains, and ponding water around curbs let water into cabinets. From below and around, rising floodwater or drain backup reaches condensing units on grade and boilers and pumps in mechanical rooms. The two paths call for different diagnoses, and the right fix depends on knowing which one you have. Our panel and switchgear flood inspection covers the electrical service that feeds this equipment.

Rooftop and Mechanical Unit Services We Provide

Rooftop Unit Water Intrusion Evaluation

Water inside a rooftop unit can reach the electrical compartment, control boards, contactors, compressors, burner section, gas valve, economizer, and insulation. We open the unit, trace where the water entered and where it went, check for corrosion and wet insulation, test electrical components, and replace parts that cannot be verified as safe. If the source is a roof curb or flashing problem, we document it for the roofing contractor so the repair does not repeat.

Split System and Condensing Unit Flood Assessment

AHRI guidance notes that if floodwater moved a split system or heat pump, even slightly, there is a risk of refrigerant leaks that may require major repair or replacement, and that a contractor should check the electrical and refrigeration connections, including control circuits. We pressure test and leak check refrigerant circuits, inspect control wiring between indoor and outdoor sections, and recover refrigerant as required. Refrigerant handling follows EPA Section 608 rules and is performed by certified technicians. Our commercial AC repair and commercial AC installation teams carry out repair or replacement.

Heating Equipment: Furnaces, Boilers, and Unit Heaters

The Consumer Product Safety Commission states that gas control valves that were underwater must be replaced because silt and corrosion damage internal components and prevent proper operation, and it recommends that fans, motors, electric circuits, and venting be evaluated by a qualified technician. AHRI adds that corrosion can start inside valves and controls even when the outside looks dry. We replace affected gas controls, inspect burners, heat exchangers, venting, and safety devices, and test operation before restart. See our commercial heating repair and commercial heating installation.

Plumbing Equipment: Water Heaters, Pumps, and Drain Systems

Commercial water heaters that floodwater reached should be replaced, according to AHRI guidance, and the pressure relief valve should be replaced as well because it can corrode and stick. We also evaluate circulation and booster pumps, sump and ejector pumps, backflow devices, condensate drains, and the piping that connects them. Our commercial plumbing repair team handles replacement, and our sump pump and water removal systems service covers pumps and controls.

Controls, Sensors, and Building Automation

Thermostats, controllers, sensors, and variable frequency drives are sensitive to moisture, and damage may not show until they fail. NEMA’s guidance lists drives among the equipment that may be reconditioned only with the manufacturer’s involvement, so we involve the manufacturer when a drive was wetted. We test and replace controls as needed and verify sequences of operation before returning equipment to service.

Coils, Ductwork, and Insulation

Wet insulation cannot be salvaged. AHRI guidance says duct insulation that contacted floodwater should be replaced and that the ductwork itself should be cleaned and dried. We replace wet insulation, clean coils, and restore airflow components. Mold assessment and remediation are restoration scope, and we coordinate with that contractor when it is needed.

Documentation and Coordination

We document findings with photographs, nameplate data, and written notes, and coordinate with the roofing contractor, restoration company, and insurer so repairs happen in the right order. Your carrier decides coverage, and we provide the technical record.

Common Causes of Rooftop and Mechanical Unit Water Damage

  • Failed curb seals, flashing, and cabinet gaskets that admit rain during storms.
  • Clogged condensate drains that overflow into the cabinet, onto the roof, or into the ceiling below.
  • Wind-driven rain entering through economizer hoods, louvers, and loose panels.
  • Ponded water around curbs that finds paths through seams.
  • Hail and storm debris that damage coils, cabinets, and seals.
  • Rising floodwater that reaches condensing units on grade, boilers, and pumps.
  • Drain and sewer backup in below-grade mechanical rooms.
  • Sprinkler discharge or pipe failure above equipment.

Repair vs. Replace After Water Exposure

Whether equipment is repaired or replaced depends on how far the water reached, how long it stayed, and the manufacturer’s instructions. These are the general rules we apply.

ComponentTypical outcomeBasis
Gas control valvesReplaceCPSC guidance: silt and corrosion damage internal components, and exposed controls are unfit for continued use
Safety controls, relays, contactors, and control boardsTest, and replace those that cannot be verifiedCorrosion inside controls may not be visible, per CPSC and AHRI guidance
Motors, fans, and blower assembliesEvaluate by a qualified technicianCPSC guidance recommends evaluation for continued safe operation
Compressors and refrigerant circuitsPressure test and leak check, and replace if leaking or contaminatedAHRI notes the risk of refrigerant leaks after floodwater exposure
Heat exchangers, burners, and ventingInspect, and replace damaged partsSafety of combustion depends on intact components
Water heatersReplace, including the relief valveAHRI guidance: the relief valve can corrode and stick
Duct insulationReplaceAHRI guidance: insulation that contacted floodwater should be replaced
Ductwork and coilsClean and dryAHRI guidance calls for cleaning and drying the ductwork
Variable frequency drivesEvaluate with the manufacturerNEMA guidance: reconditioning only with the manufacturer

Every replace or reuse decision is documented with its basis, and the manufacturer’s instructions take precedence.

Advantages of Professional Evaluation After Water Exposure

  • Safety. Gas, electrical, and refrigerant systems are involved, and equipment should not be restarted until qualified personnel have evaluated it.
  • Hidden damage. Corrosion inside valves and controls can start while the outside looks dry.
  • Refrigerant compliance. Technicians certified under EPA Section 608 handle refrigerant.
  • Sound decisions. Replace-or-repair calls are tied to manufacturer and industry guidance and documented.
  • Coordination. One contractor can work with the roofer, restoration company, and insurer so repairs happen in order.
  • One team across trades. Plumbing, cooling, and heating are evaluated together.

Our Rooftop and Mechanical Unit Water Damage Process

  • Shutdown and safety. Confirm the equipment is off, safe to approach, and isolated from power and gas as needed.
  • Water path trace. Identify whether water came from above, from below, or both, and where it traveled.
  • Inspection. Examine electrical, gas, refrigerant, hydronic, and plumbing connections, and inspect insulation, coils, and cabinets.
  • Testing. Test controls, safety devices, motors, and refrigerant circuits.
  • Findings and scope. Document conditions and provide a repair or replacement scope.
  • Repair or replacement. Licensed technicians complete the work to manufacturer and code requirements, with permits where required.
  • Verification. Test operation and safety devices before returning the equipment to service.

Why Indianapolis-Area Properties Choose Mission Mechanical for Water Damage Repair

What We OfferWhat It Means for You
Indiana License CP 10200022State-verified expertise on every commercial HVAC and plumbing project in Indiana
Fully Insured (GL + Workers Comp)Zero liability exposure for your property at every stage of the job
BBB Accredited, A+ RatingThird-party verified trust record backed by a nationally recognized consumer organization
Highly Rated on Google and YelpConsistently recognized by commercial clients for service quality and technical accuracy
NATE-Certified TechniciansHVAC expertise verified by the most recognized independent certification body in the industry
23 Years Serving Central IndianaDeep local commercial knowledge and a proven track record built project by project since 2002
Indianapolis Colts Small Business Partner 2026An active and recognized participant in the greater Indianapolis commercial business community
MICCS Safety MemberVerified commitment to jobsite safety standards on every commercial project we take on
Schedule Service OnlineRequest commercial service at any time through our online scheduling system

Local Data: Storms and Water Damage in the Indianapolis Area

The National Weather Service in Indianapolis documented heavy rain from August 11 to 17, 2026. Marion County station reports ranged from 2.66 to 5.90 inches, including 5.10 inches at a Lawrence station and 5.05 inches at Castleton, and Hamilton County reports ran higher, with 6.87 inches at Noblesville and 5.66 to 6.43 inches at Carmel. Totals this heavy test rooftop seals, condensate drains, and below-grade mechanical rooms, and the White River set record crests that week. From our Lawrence headquarters, we serve properties across Indianapolis and central Indiana.

For Hamilton County properties, see our Carmel commercial flood damage response and Fishers commercial flood damage response. To reduce exposure before the next storm, read our guide to flood-proofing a commercial mechanical room and our storm damage checklist.

Codes and Permits for Water Damage Repairs

Refrigerant handling follows EPA Section 608 rules, and gas, mechanical, plumbing, and electrical work follows the codes that apply in Indiana. Equipment replacement, gas piping, and water heater replacement typically require permits through the City of Indianapolis or the applicable local jurisdiction, and Mission Mechanical coordinates permitted work.

Areas We Serve in Central Indiana

Mission Mechanical provides commercial services throughout Lawrence, Indianapolis, and surrounding central Indiana communities.

We also provide commercial AC maintenance, commercial heating maintenance, and commercial emergency electrical repairs for commercial properties throughout central Indiana.

Water damage in a rooftop unit or mechanical room?

Call Mission Mechanical at 317-733-8686 or request an equipment evaluation online. Indiana License CP 10200022. Fully insured. BBB A+. NATE-certified technicians.

Frequently Asked Questions: Rooftop and Mechanical Unit Water Damage Repair

It is the evaluation, repair, and replacement of HVAC and plumbing equipment that has been wetted or submerged, including rooftop units, condensing units, air handlers, furnaces, boilers, unit heaters, water heaters, and pumps. The work includes the piping, gas, refrigerant, and control connections that serve the equipment, and it ends with testing before the equipment returns to service.
We evaluate rooftop units, split-system and heat pump condensers, air handlers, furnaces, boilers, unit heaters, make-up air units, water heaters, circulation and booster pumps, sump and ejector pumps, and their controls and connections. Electrical panels and switchgear that serve this equipment have a separate inspection service.
Yes. Mission Mechanical holds Indiana License CP 10200022 for HVAC and plumbing, employs NATE-certified technicians for HVAC work, carries full general liability and workers compensation insurance, and is BBB A+ accredited. The company has served central Indiana commercial properties since 2002.
No. Roof membrane, flashing, and curb repairs belong to a roofing contractor. Mission Mechanical documents where water entered the equipment, repairs or replaces the equipment, and coordinates with the roofer so the source is fixed before the unit is restarted.
Common paths include failed cabinet seals and gaskets, deteriorated curb flashing, loose panels, wind-driven rain through economizer hoods and louvers, and clogged condensate drains that overflow into the unit. Water that ponds around a curb can also find its way in through seams. A technician traces the path so the repair addresses the source.
Signs include stains or dripping at the ceiling below the unit, rust or standing water in the cabinet, corrosion on the electrical compartment or control board, tripped breakers, unit lockouts, unusual noises, wet insulation, and musty odors from the supply air. Any of these warrants evaluation by a qualified technician.
Yes. Water in an electrical compartment or burner section can damage components and create a safety risk, so the unit should be shut off by qualified personnel and not restarted until it has been evaluated. A technician checks the electrical, gas, and refrigerant systems before returning it to service.
A clogged condensate drain can back up into the drain pan and overflow into the unit cabinet, onto the roof, or into the ceiling below. The water can reach insulation, controls, and electrical components and can stain or damage the building. A cleared line and a check for water damage prevent a repeat.
Hail can dent cabinets and bend coil fins, which restricts airflow and can reduce capacity. Coil damage and any resulting water entry should be evaluated after a severe storm. We inspect coils, cabinets, and seals and recommend repair or replacement.
Standing water against a curb puts constant pressure on seams and flashing and can find paths into the unit or the building below. The fix involves drainage and roofing repairs by a roofing contractor, and our role is to evaluate and repair any equipment the water reached.
They need evaluation before they are run. AHRI guidance notes that if floodwater moved a split system or heat pump, even slightly, there is a risk of refrigerant leaks and damaged control wiring, and that gas and oil boilers and furnaces that floodwater reached should be checked by a qualified contractor because corrosion can start inside valves and controls.
Sometimes, depending on how high the water reached and how long it stayed. AHRI guidance advises replacing rather than repairing flood-damaged heating, cooling, and water heating equipment, so replacement is common. We inspect the refrigerant circuit, controls, motors, and wiring, and recommend the sound option.
Water heaters that floodwater reached should be replaced, along with the pressure relief valve, according to AHRI guidance. For boilers, valves and controls that were in contact with floodwater are replaced, and a qualified contractor inspects the unit before restart. The decision depends on the exposure and the manufacturer's instructions.
No. The Consumer Product Safety Commission states that gas control valves that were underwater must be replaced, because silt and corrosion damage internal components and prevent proper operation. Even if a control seems to work, it is not considered fit for continued use.
Technicians check the burner compartment, gas valve, ignition and flame controls, heat exchanger, venting, blower, and safety switches for water, corrosion, and damage. Controls that were exposed are replaced, and combustion and safety operation are tested before restart.
Water and debris can damage lines, fittings, and controls, and AHRI notes the risk of refrigerant leaks when a unit has been moved by floodwater. A pressure test and leak check confirm the integrity of the circuit, and any refrigerant recovery follows federal rules.
Technicians certified under EPA Section 608 handle refrigerant. Mission Mechanical's technicians recover, evaluate, and recharge systems in line with federal rules.
They are evaluated by a qualified technician. The Consumer Product Safety Commission recommends that fans, motors, and electric circuits be evaluated for continued safe operation after flooding. We test windings and operation, inspect for corrosion and contamination, and replace components that fail or cannot be verified.
Water heaters, circulation and booster pumps, sump and ejector pumps, backflow devices, condensate drains, and connecting piping can all be affected. Sewer backup adds contamination concerns. A licensed plumber evaluates each item and replaces what cannot be verified.
Usually yes. AHRI guidance says a water heater that floodwater reached should be replaced, including the pressure relief valve, which can corrode and stick. We confirm the condition of the unit and install a replacement suited to the building's demand.
They are assessed, repaired or replaced as needed, and tested as required by the water provider and local code. Contamination is the concern, since a damaged backflow device may not protect the potable water supply.
Moisture can corrode contacts and circuit boards, and damage may not show until later. We test controllers, sensors, and thermostats, replace those that cannot be verified, and confirm sequences of operation before returning equipment to service.
NEMA's guidance lists drives among the equipment that may be reconditioned only with the manufacturer's involvement. We contact the manufacturer when a drive was wetted and replace it when reconditioning is not an option.
When the panels, switchgear, disconnects, or motor control centers that serve the equipment were exposed to water. Those assemblies have their own evaluation requirements, described on our panel and switchgear flood inspection page, and they must be cleared before the equipment they feed is energized.
AHRI guidance says duct insulation that contacted floodwater should be replaced and that the ductwork itself should be cleaned and dried. We replace wet insulation, clean coils and airflow components, and coordinate with a restoration contractor if mold assessment or remediation is needed.
No. Mold assessment and remediation are specialized restoration work performed by qualified restoration contractors. We replace wet insulation and damaged components and coordinate timing so equipment is reinstalled only after the space has been appropriately dried.
We confirm the equipment is shut down and safe to approach, trace the water path, inspect electrical, gas, refrigerant, and plumbing connections, test controls and safety devices, and document the findings. We then provide a repair or replacement scope, complete the work, and test operation before returning the equipment to service.
We provide written findings, photographs, and equipment information that describe the condition of the equipment and the repair scope. Your carrier decides coverage, so share the documentation with them early and ask whether replaced components should be kept for review.
Equipment replacement, gas piping, water heater replacement, and electrical work typically require permits through the City of Indianapolis or the applicable local jurisdiction. Mission Mechanical coordinates permitted work and follows applicable codes.
Call Mission Mechanical at 317-733-8686 or request service online. A licensed team will evaluate the equipment at your Indianapolis-area property and provide a written repair scope.
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