16-Foot Gas Spray Foam Rig
Air-driven proportioner platform built for residential and medium-size commercial spray foam applications. Gas-powered for full site independence.
Professional Production System
This 16-foot gas spray foam rig is a turnkey mobile polyurethane processing system built for contractors performing residential and medium-size commercial interior spray foam applications.
At every job, two liquid chemical components are heated, pressurized, and reacted at the spray gun to manufacture polyurethane foam insulation on-site. The performance of this process depends on the entire system — from generator to hose to gun — operating as a matched, integrated platform.
This rig is built around the Graco Reactor A-25 air-driven proportioner, a 20 kW gas generator, and a 35 CFM gas compressor — all matched to support reliable production on interior residential and commercial projects.
16-Foot V-Nose Trailer
| Trailer | 8.5' × 16' V-Nose Enclosed |
| GVWR | 10,000 lb — torsion axle suspension |
| Hitch | 2-5/16 coupler |
| Tongue Jack | Electric tongue jack |
| Interior Height | 7 ft 6 in |
| Tongue Weight | ~800–850 lbs typical |
| Tow Vehicle | Most contractor pickup trucks |
| Wall System | Polycore insulated composite panels |
Interior Spray Room Layout
The interior layout of a spray foam rig is engineered for workflow efficiency and safety. The proportioner, chemical drums, and workstation are positioned to minimize hose runs, reduce operator fatigue, and maintain safe access to all systems during operation.
Graco Reactor A-25
The Graco Reactor A-25 is an air-driven proportioning machine rated for approximately 20–25 lb/min output, designed for dependable spray foam production in mobile rig environments. Because it operates using compressed air rather than large electrical loads, the A-25 provides reliable performance while remaining simple to service and maintain in the field.
In mobile spray foam rigs, the proportioner is the central component that controls material pressure, temperature, and ratio, ensuring consistent foam quality at the spray gun. The A-25 platform has become a proven industry standard due to its durability, straightforward mechanical design, and ability to operate independently from high electrical power requirements.
For gas-powered mobile rigs, the A-25 integrates seamlessly with compressor-driven air systems, allowing contractors to run a complete spray foam setup without relying on large generators or complex electrical infrastructure. This makes it a dependable cornerstone of many field-built spray foam rigs used for residential and light commercial applications.
| Machine | Graco Reactor A-25 |
| Drive Type | Air-driven proportioner |
| Output Class | 20–25 lb/min |
| Heated Hose | 160 ft package included |
| Spray Gun | Graco Fusion PC |
| Tip Package | #02 mixing chamber & spray tip kit |
| Rebuild Kit | FIX-IT Box / O-ring rebuild kit included |
| Flush Kit | Gun flush pot kit included |
| Transfer System | Regulators & material plumbing |
| Recirculation Manifold | Integrated recirculation manifold allows material to circulate through the system during startup and periodic maintenance when the rig is not actively spraying. |
| Recirculation Purpose | Circulating material periodically helps reduce crystallization buildup in hoses and plumbing when equipment sits idle for extended periods. |
Generator & Electrical
| Generator | 20 kW electric-start gas generator providing independent power for proportioner heaters, lighting, and trailer electrical systems during mobile jobsite operation. |
| Panel | Integrated electrical breaker panel distributes generator power safely to heaters, outlets, and auxiliary equipment throughout the rig. |
| Lighting | LED interior lighting provides clear visibility for equipment operation, maintenance, and material handling inside the trailer. |
| Outlets | 110V convenience outlets allow connection of auxiliary tools, transfer pumps, and service equipment when working inside the rig. |
| Shore Power | 110V shore power inlet allows heaters to operate overnight without running the generator, helping maintain proper material temperature between spray days. |
Compressor & Air Drying
| Compressor | 35 CFM gas-powered compressor supplying continuous drive air for the proportioner, transfer pumps, and spray gun operation during spraying. |
| Air Drying | Refrigerated air dryer with filtration removes moisture and contaminants from the compressed air supply before it reaches system components. |
| Distribution | Air regulator manifold distributes controlled air pressure to the proportioner drive system, material transfer pumps, and spray gun. |
| Filtration | Inline filtration integrated with the air regulator manifold removes particulates and contaminants before air is distributed to the proportioner, transfer pumps, and spray gun. |
| Purpose | Clean, dry air helps prevent moisture contamination and ensures reliable operation of pneumatic equipment used throughout the spray system. |
Keeping Materials in Range
Spray foam equipment is one complete processing system. Temperature management at every point — trailer interior, drum storage, hose temperature — affects what happens at the spray tip. Maintaining material temperature within the manufacturer's processing range is critical to consistent foam production.
Proper chemical conditioning and storage temperature play a critical role in consistent foam performance. Learn more about material temperature, storage conditions, and shelf life in our guide to spray foam material conditioning and storage.
Everything Included Day One
This is a fully equipped turnkey rig. Pull onto the jobsite, plug in your hose, and spray. Every system is installed, tested, and ready for production.
- ▶Wall-mounted gun flush pot
- ▶Lockable tool cabinets
- ▶Separate toolbox storage
- ▶Stainless steel countertop
- ▶Bench vise
- ▶Drum racks & strap system
- ▶Steel drum dolly & bung wrench
- ▶Desiccant drum dryers
- ▶Pour-over spouts & bucket screens
- ▶Spill containment kit
- ▶Drum ramp transition plate
- ▶Two-worker supplied air system
- ▶100-ft breathing air hose
- ▶PPE starter kit
- ▶SDS station & eyewash station
- ▶Fire extinguisher & first aid kit
Interior spray foam work in enclosed spaces requires supplied breathing air — not just a respirator. Your two-worker air system operates independently from the compressor. Contractors performing interior spray foam applications are required to use supplied breathing air systems.
Every rig includes hands-on training covering foam materials & densities, estimating & yield calculations, equipment operation, spray gun maintenance, troubleshooting procedures, and manufacturer spec sheet review.
System Investment
We work with multiple spray foam manufacturers.
Because manufacturers maintain regional warehouses across the United States, contractors can typically receive material shipments quickly regardless of location.
In many cases:
- • Orders placed before noon ship same day
- • Material may arrive next business day
This calculator provides rough estimates only. Actual yield, material cost, and R-value depend on foam type, substrate conditions, ambient temperature, application technique, and manufacturer specifications. Always consult with the material manufacturer and account for waste and transitions in your project planning.
Foam Yield Reference
Temperate Climate (Zones 4-5)
Recommended minimum insulation levels based on IECC wall requirements.
Recommended for temperate climate (zones 4-5):
- ▶2" ≈ R-13 to 14
- ▶3" ≈ R-19 to 21
- ▶3.5" ≈ R-22 to 25
Recommended for temperate climate (zones 4-5):
- ▶3.5" ≈ R-13 to 14
- ▶5.5" ≈ R-19 to 22
- ▶7" ≈ R-24 to 28
Foam Yield & Material Estimator
Estimate board feet, material sets, approximate insulation performance, and project material cost based on square footage and spray thickness.
Calculated using closed-cell foam yield range of 4,000–4,500 board feet per set and material cost of $2,500–$2,800 per set. Actual yield and cost vary by material brand, substrate, and conditions. Always add overage for waste and transitions.
Results vary based on job complexity, regional pricing, production efficiency, and consistent rig deployment.
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