887 Tropi-Cool Silicone Roof Coating

Henry 887 Tropi-Cool is a 100% silicone white roof coating. It is a moisture-cure coating that appears as a glossy white liquid, and the data sheet is dated 04/06/2017. The 100% silicone chemistry is especially suited to extreme tropical environments with hot, wet weather and intense UV exposure, and the coating is suitable for use in all climates. As a silicone roof coating, it belongs to the Henry roof coatings and sealants range.

• Solids content by volume: 91% +/-3.
• VOC: 10 g/l maximum.
• Tensile strength: 275 psi minimum.
• Elongation at break: 150% minimum.
• Durometer hardness, Shore A: 42 +/- 5 points.
• Permeability: 4.6 nominal.
• Flash point: 140.9 F (60.5 C).
• Tack-free time: 1 to 2 hours.
• Cure time: 2 to 6 hours.
• Application temperature: 35 F to 120 F (2 C to 49 C).
• Unopened shelf life: 24 months.

The values are per the Cool Roof Rating Council (CRRC).

• Solar reflectance: 0.88 initial and 0.83 Rapid Rating.
• Thermal emittance: 0.88 initial and 0.88 Rapid Rating.
• Solar Reflectance Index (SRI): 111 initial and 104 Rapid Rating.

• ENERGY STAR certified.
• CRRC product ID 0620-0038, a Cool Roof Rating Council rated listing.
• Meets the requirements of California Energy Commission (CEC) Title 24 Section 118(i)3.
• Florida Product Approval FL# 17412.1, 17431.3 and 17431.4.
• Miami-Dade County Product Control Approved, NOA# 14-1217.01, 14-1217.02 and 14-1217.03.
• UL Classified: cements and coatings for roofing systems as to external fire exposure <74LM>.
• FM Approved as a roof coating under its conditions of approval, when installed as described in the current edition of the FMRC approval guide.
• Tested and certified by NSF International in accordance with NSF Protocol P151, Health Effects from Rainwater Catchment System Components.
• Meets or exceeds ASTM D7281, water migration resistance through roof membranes.
• Meets or exceeds ASTM D6694, liquid-applied silicone coating used in spray polyurethane foam roofing systems.

Under NSF Protocol P151 the coating is applied in 1 to 3 coats to a maximum field-use dry film thickness of 30 mils, with a maximum of 15 mils per coat. Recoat cure is 24 hours at 100 F (38 C) and final cure is 48 hours at 100 F (38 C).

The coating is used on commercial and residential roofs, on low slope roofs and on pitched roofs. Listed roof types are aged asphalt roofs including built-up roofing (BUR) and modified bitumen (MB), aged single-ply and rubber roofs including TPO, EPDM, PVC and Hypalon, spray polyurethane foam (SPF) roofs, metal roofs, concrete roofs, previously coated roofs, and RV, trailer and mobile home roofs. It is not recommended over shingles of any kind. The moisture-cure bond with the roof gives permanent ponding water resistance. It is rain-safe in 15 minutes and mold and mildew resistant.

The roof is washed with a non-filming detergent such as TSP or a TSP substitute. Algae and moss are treated with a 50:50 mix of laundry strength liquid chlorine bleach and water with a 15 to 20 minute dwell, then rinsed at low pressure. The roof dries completely, and dust and debris are cleared with a leaf blower or broom. A test area of coating is applied over the existing membrane to check for bleed-through and adhesion. Defects such as splits, cracks, blisters, deteriorated flashing and cracked metal edging are repaired. Penetrations, curbs, flashings and transitions are sealed with Henry 884 Tropi-Cool 100% Silicone Roof Sealant or Henry 885 Tropi-Cool 100% Silicone Seam and Repair Roof Sealant. On metal roofs, rust is removed by wire brushing.

The coating can settle in storage and is mixed before and during use with a drill and paddle. For 1 and 5 gallon pails the paddle is at least 3 inches in diameter, and for drums at least 6 inches. Application is by 1/2 inch to 1 inch nap lint-free roller, brush or commercial airless spray rig.

• The coating is applied in one coat over the entire roof surface, including parapet walls, at a minimum of 1.5 gallons per 100 square feet. Dry film thickness is at least 22 mils.
• On steep slopes and rough or aged surfaces, additional coats may be needed. Further coats go on within 48 hours, perpendicular to the previous coat; after 48 hours the first coat may need washing.
• Polyurethane foam is coated within 24 hours of application. New concrete roofs cure at least 28 days before coating.
• Spray rig: at least 3500 psi at the gun tip, a pump of at least 3 gallons per minute fed by a 5:1 transfer pump, Buna-N jacketed hoses with a minimum inside diameter of 3/4 inch, and a 5000 psi gun with a reverse-a-clean tip of 0.030 minimum orifice and 50 degree fan. Hoses previously used for acrylics are not used.
• Application below 35 F (2 C), or when rain is expected in less than 15 minutes, is not recommended.

Coverage is approximately 320 square feet per 5 gallon pail, about 100 square feet per 1.5 gallons, and varies with surface texture and porosity. Product sizes are 1 gallon, 5 gallon and 55 gallon. Tools and spray equipment holding uncured material are cleaned or flushed with VM&P naphtha or mineral spirits. Because the product cures with moisture, it is not left in spray equipment for prolonged periods unless the equipment has moisture lock hoses, fittings and seals. Silicone coated surfaces are extremely slippery. The coating is not thinned. Henry's limited warranty provides replacement of product proved to have a material defect during the life of the existing roof, if applied in accordance with Henry's written directions and with proof of purchase. The warranty is void if the coating is coated over, patched, painted or covered with any product other than this coating or approved products.