884 Tropi-Cool Silicone Roof Sealant

Henry Tropi-Cool 884 is a 100% silicone roof sealant supplied in a 10.1 fl oz cartridge. It is a high solids dispersion of 100% silicone, one-component, moisture-curing and solvent-free, and the data sheet is dated 03/26/2015. It is a separate product from the 887 field coating. It is applied by caulking gun for localized details, and its range of uses includes roofs and joints. As a roof sealant, it belongs to the Henry roof coatings and sealants range.

• Appearance: white; color: bright white.
• Maximum VOC: 25 g/l.
• Solids content by volume: 91% +/-3.
• Application temperature: 35 F (2 C) and rising; range 35 F to 120 F (2 C to 49 C).
• Tack-free time: 1 to 2 hours.
• Cure time: 48 hours.
• Elongation at break: 250 minimum.
• Tensile strength: 180 minimum.
• Unopened shelf life: 24 months from manufacture when stored in a cool, dry, shaded location.

• Package: 10.1 fl oz cartridge.
• Coverage: about 32 linear feet per cartridge at a 3/8 inch bead.
• Paintable: no.

The sealant is UV resistant with no hardening, chalking, crazing or cracking, and is mold and mildew resistant. It is ponding water resistant and bonds to a wide variety of building materials on vertical and horizontal applications.

On roofs the sealant is used on existing asphalt roofs, including built-up roofing (BUR) and modified bitumen (MB), aged single-ply roofs, spray polyurethane foam (SPF) roofs, metal roofs, concrete roofs and previously coated roofs. It is also used on RV, trailer and mobile home roofs, flashing, fasteners and drains.

The sealant bonds to Henry 887 Tropi-Cool silicone roof coating, and it is used to seal gutters. It is used on EPDM rubber roofs, where additional preparation and an adhesion test may be needed. It is not used on windows and doors.

Beyond roofs, the sealant is used in non-structural glazing and as a weatherseal. It is used for vertical and horizontal crack repairs and vertical and horizontal 2-point adhesion on control joints. It is also used in concrete restoration, stucco repair and restoration, and Exterior Insulation and Finish System (EIFS) installation and restoration.

The surface is cleaned and allowed to dry, free of dust, rust, residue and contaminants such as chalk, grease and wax. Rust and scale are removed from metal by wire brushing, and residue in low areas is scrubbed with detergent and rinsed. The surface is dry and frost-free. Adhesion is tested on each different substrate by applying a bead, letting it cure and pulling one end. Joints that receive sealant are sound, smooth, uniform in dimensions and free from defects and foreign materials. They are clean, dry and free from frost and contaminants such as curing compounds, waterproofing sealers and coatings.

The sealant is ready to use. The tip is cut on an angle, the seal inside the tip is punctured, and the cartridge goes in a caulking gun. For a smooth seal the gun is held at a 45 degree angle and sealant is pushed ahead of the nozzle.

• Tooling is necessary in vertical and horizontal joints to aid contact with the substrate, eliminate air bubbles and give a concave appearance.
• A backer rod is used when filling joints deeper than 1/2 inch.
• The sealant can be applied over old silicone coating or sealant that has cured.
• It is worked into the crack or break and spread 2 inches to 4 inches beyond, with the edges feathered.
• Voids in a patched area are filled with more sealant, which cures before coating.
• Application below 35 F (2 C), or when rain is expected in less than 1 hour, is not recommended.
• The sealant is not thinned. A skin that forms in the tip is removed and the rest used.

It is tack-free in about 1 to 2 hours and fully cured in about 48 hours, depending on temperature and humidity.

Tools are cleaned with mineral spirits before the sealant cures, and hands with waterless hand cleaner. The sheet carries a warning for skin and eye irritation, and the product is for exterior use only. 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 product is coated over, patched, painted or covered with any product other than this product or approved products.