Expandothane Roof Coating

 

 

RSP | 800-538-6723

 

 

RSP Painting provides nationwide, self-performing installation of Expandothane—a high-performance, two-component hybrid polyurea/polyurethane spray-applied roof coating. Applied using our company-owned Graco Reactor 30 high-pressure rigs, Expandothane expands up to 7 times its liquid volume upon application, sealing gaps, structural cracks, pinholes, and open seams into a seamless, waterproof membrane.

Core Technical Capabilities & Specifications

 

  • Micro-Expansion Action: Expands 500% to 700% as it hits the substrate, forcing fluid deep into open lap seams, backing out loose fasteners, and sealing porous substrates.

  • Extreme Tensile & Elongation Strength: Expands and contracts seamlessly with seasonal temperature spikes without cracking, splitting, or tearing.

  • Thermal Isolation & Reflectivity: Paired with an elastomeric reflective topcoat, it eliminates thermal bridging, reduces surface roof temperatures by up to 60°F, and slashes HVAC energy usage by 15% to 30%.

  • Rapid Cure Rate: Reaches tack-free status in seconds, eliminating wash-off risks from sudden rain showers during application.

  • IRS Section 179 Tax Advantages: Qualifies as a building maintenance and repair expense, allowing facility owners to write off 100% of the project cost in year one rather than depreciating over 39 years.

 

 

Approved Substrate Compatibility

 

Substrate Type

 

 Common Commercial Issues

 

 How Expandothane Fixes It

 
Metal Roofs (R-Panel, Standing Seam) Rust, backed-out screws, leaking lap seams Encapsulates fastener heads, seals seams, and halts active oxidation.
Modified Bitumen & BUR Alligatoring, dried asphalt, membrane shrinkage Penetrates weathered voids, bonds cracked surfaces, and creates a monolithic cap layer.
Single-Ply (TPO, EPDM, PVC) Failed seam tape, shrink tears, membrane chalking Re-bonds deteriorating field seams and eliminates perimeter flash leaks.
Concrete Decking Micro-fissures, moisture migration, surface spalling Penetrates surface pores to establish a structural, waterproof barrier.
Spray Polyurethane Foam (SPF) UV degradation, bird peck damage, surface weathering Serves as an impenetrable protective self-healing elastomeric armor.

 

Step-by-Step Field Installation Process

 

1. Surface Substrate Preparation
Critical step to ensure 100% adhesion

High-pressure power washing (3,500+ PSI) cleans all surface dirt, chalk, loose rust, and debris. Damaged insulation or wet backing material is removed and replaced.

2. Primer & Rust Treatment
Ensures maximum mechanical bond

Metal surfaces receive rust-inhibitive primers; single-ply membranes receive surface-activating wash primers to guarantee optimal bonding strength.

3. Plural-Component Graco Reactor 30 Spraying
High-pressure 1:1 volumetric mix

Our technicians apply Expandothane through Graco Reactor 30 rigs at heated temperatures and high pressure, allowing the 7x micro-expansion technology to seal all voids, seams, and fasteners.

4. Reflective Protective Topcoat Application
UV resistance and maximum energy efficiency

A high-solids white silicone or acrylic finish coat is applied over the cured Expandothane layer to provide permanent UV defense and Solar Reflective Index (SRI) ratings.

 

 

Frequently Asked Questions

 

How does Expandothane differ from standard silicone or acrylic coatings?

Standard roof coatings dry thin and require perfectly smooth surfaces. Expandothane is a plural-component liquid that expands up to 7 times its volume during spraying. It fills deep gaps, seals structural cracks, and locks around loose fasteners where standard flat paints fail.

How does Expandothane qualify for full tax write-offs under IRS Section 179?

Because Expandothane restores an existing roof structure without tearing off the original assembly, federal tax codes categorize it as a routine maintenance repair rather than a capital improvement. This allows building owners to deduct 100% of the cost in the year of installation.

Can Expandothane be applied in cold weather or high humidity?

Yes. Applied through heated lines in our Graco Reactor 30 equipment, Expandothane cures in seconds regardless of ambient air moisture. This allows RSP Painting to extend installation seasons beyond standard coating windows.

What warranties are available for Expandothane applications?

RSP Painting offers non-prorated manufacturer system and labor warranties ranging from 5 to 20 years, fully covering material integrity and leak prevention.

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RSP | 800-538-6723