VFI®-727 HFC Spray Polyurethane Foam

Features & Benefits

• Absolute sustainability – can be repeatedly recoated to extend the roof’s life
• Exceptional durability – creates a watertight seal to protect the roof from physical impacts and natural wear and tear
• Unparalleled energy efficiency – acts as a thermal barrier to limit hot and cold airflow into the building, helping decrease HVAC usage and energy costs
• Self-flashing, seamless surface – coats entire roofing system to protect vulnerable areas from leaks and wind uplift
• 3 reactivity grades – regular, winter, and summer speed variations for convenience no matter where you are or when you spray
• Easy installation – quick and non-intrusive application, resulting in minimal downtime for building owners

Instructions for Use:

Surface Preparation

Before applying VFI-727, inspect the substrate surface for needed preparation. Remove dirt, dust, debris, and other substances detrimental to adhesion with a broom. The existing structural components of the roof should be examined and repaired, including vents, ducts, gutters, flashing, and other penetrations. All gaps should be repaired to be tight and flush by installing additional screws or rivets to restrict them to ¼” or less. Loose or backed-out fasteners must be tightened or replaced with oversized fasteners.

Power wash the roof as needed. Use a liquid cleaning detergent to scrub areas containing grease, oil, or other contaminants. A concentrated chlorine solution can treat mildew, fungus, or algae spots. Make sure to rinse all cleaning agents off the roof and allow it to dry before the application of SPF.

Application

Before spraying, you must premix VFI-727 HFC Spray Polyurethane Foam POLY (B side) components until uniform. Mix times may vary depending on volume and mixing method. The substrate temperature should be between 50°F – 120°F during use. If the temperature passes 72°F, the pot life will shorten.

Protect objects from overspray and move portable objects to an acceptable area. Turn off and cover all intake air vents. VFI recommends spraying the foam with a digitally controlled robotic SPF application device to improve consistency, slope, and visual appearance.

Spray the polyurethane foam in minimum 1-inch-thick passes per square over the entire roof. The total thickness once the foam expands should be a minimum of 1.5 inches, except around areas leveled or tapered for proper drainage. Check specifications for required wet and dry film thickness. The foam should end neatly at a minimum of 4 inches above the roof surface at penetrations. Apply foamed-in-place can’t strips for a smooth transition from horizontal to vertical surfaces. The foam application process should be completed in a single day.

Once cured, the surface texture of the foam should be “smooth to orange-peel,” (free of voids, pinholes, and depressions). “Verge of popcorn” texture is acceptable if the foam can be thoroughly coated. Popcorn and tree bark textures are not acceptable and must be removed and re-foamed before coating application. To protect the foam from UV light, apply a roof coating within 48 hours of the spray foam curing.

Cleanup

To clean spray equipment, VFI recommends using xylene or MEK. Flush the cleaning solvent through spray lines until the chemical mixture is removed.

Safety

*Always read the safety data sheet before working with chemicals

Use chemicals only as directed and for their intended purpose. Do not dispose of chemicals down the drain. Most chemicals must be disposed of as hazardous waste.

PPE to avoid all unnecessary exposure:

• Eye protection – wear safety glasses and any additional eye protection as necessary
• Hand protection – wear chemically resistant protective gloves (nitrile, butyl, or neoprene)
• Skin and body protection – wear suitable protective clothing
• Respiratory protection – in case of insufficient ventilation, wear suitable respiratory equipment. Respirator selection must be based on known or anticipated exposure levels, the hazards of the product, and the safe working limits of the selected respirator

Product Limitations

VFI-727 is not a UV color stable product and has no long-term UV testing. It contains a chemical blowing agent and should be kept out of direct sunlight to prevent pressure buildup. Before use, release the drum bungs slowly to relieve any built-up pressure within the container.

• Incompatible materials – A side: oxidizers. B side: none known
• Conditions to avoid – heat and incompatible materials
• Chemical stability – stable under normal storage conditions
• Reactivity & hazardous reactions – no dangerous reactions known under normal use
• Hazardous decomposition products – may include, and are not limited to, oxides of carbon

Potential Health Hazards

• May cause stomach distress, nausea, or vomiting if swallowed.
• May cause skin irritation and sensitization: redness, edema, drying, defatting, or cracking.
• May cause respiratory tract irritation, allergy or asthma symptoms, or breathing difficulties.
• Causes serious eye irritation: discomfort, pain, excess blinking and tear production, with marked redness and swelling of the conjunctiva.

*If you are experiencing any of these symptoms, seek medical assistance or attention. Call a poison control center or doctor if swallowed.