Sika® Black Jack®-904 Bitumen Roof Felt Adhesive

Oxidised bitumen in hydrocarbon.

24 months from date of manufacture in unopened and undamaged containers.

Contains a flammable solvent and all precautions against fire must be taken during storage. Store between +5 and +25 °C.  

ca. 0.9 - 1.0 g/cm³  +20 °C.

Resistant to: most salt solutions, dilute acids and alkali, and water.
Not resistant to: oils, solvents and some detergent solutions. 
If not sure, check first in an inconspicuous area.

+10 °C to +25 °C. Surfaces must be free from ice and water.

+10 °C to +25 °C. Surfaces must be free from ice and water.

24 hours depending on drying conditions.

As Roof Felt Adhesive: Approx. 1.3 - 1.6 m² per L.
As Gritting Adhesive: Approx. 3 mm Chips – 1.4 m² per L.                     
                                      Approx. 10 mm Chips – 1.1 m² per L.

All surfaces must be dry, stable and thoroughly cleaned to remove all traces of dirt, dust and grease. Wet surfaces should be brushed free from water and wiped with a dry cloth to remove any moisture which remains. Repair cracks and holes using Black Jack® 903 Bitumen Trowel Mastic, stick down loose felt etc. with Black Jack® 904 Roof Felt Adhesive. Metal surfaces should be wire-brushed to remove rust. Where long-term protection is required an initial treatment of a rust-inhibitive product such as red lead or zinc phosphate should be used. Loose or blistered paint should be removed, as should tar-based paint systems. New galvanised surfaces should be roughened with a wire brush or treated with a proprietary etch primer. Concrete, cement and other porous surfaces should be primed using Black Jack® 902 Bitumen & Flashing Primer and allowed to dry. Where there is green growth present, clean surfaces with Sika® Mouldbuster as directed, before proceeding.

Stir product thoroughly before use and during use.  Sika® Black Jack®-904 Bitumen Roof Felt Adhesive should be brush or mop applied to the surface and left “open” for 15 to 30 minutes (depending upon drying conditions) in order to develop its full tackiness. The felt should be placed into the wet adhesive film carefully, rubbing or rolling each section down to ensure maximum contact with the adhesive and ensuring that all air has been excluded. The felt should then be weighted down until the felt has adhered to the surface. Whenever possible, the felt should be unrolled into the adhesive and rolled home with a lighter roller (approx. 25 kg).

AS A LAP CEMENT
Laps at the edges should be at least 75 mm wide and laps at roll ends should be at least 150 mm. Laps and final edges should be liberally treated on their underside with Sika® Black Jack®-904 Bitumen Roof Felt Adhesive and well compacted.

TIMBER ROOFS
On timber roof structures, the first layer of felt must be nailed down. The second and third layers may be bonded with Sika® Black Jack®-904 Bitumen Roof Felt Adhesive.

CONCRETE AND LIGHTWEIGHT CONCRETE SCREEDS
As they are often extremely porous, these surfaces will require a priming coat to ensure successful adhesion of Sika® Black Jack®-904 Bitumen Roof Felt Adhesive. Prime with Black Jack®-902 Bitumen and Flashing Primer. It is essential that the primer has completely dried before the first layer of felt is applied.

AFTERCARE

24 hours after laying, check all bonding to ensure that full adhesion has been obtained. Particularly check all laps; if in doubt, press home or roll any felt that appears to be lacking full adhesion.
AS A COLD-GRITTING SOLUTION
Sika® Black Jack®-904 Bitumen Roof Felt Adhesive is suitable for use as a gritting solution for roofs with up to a 10 ° slope. The roof surface should be clean and free from dirt, dust and all loose debris. The surface should be preferably dry although the product may be applied to damp, but not wet or waterlogged, surfaces. The compound should be spread evenly direct from the container in convenient areas of 20 m² at a time. Do not allow the film to form a puddle or become too thin. The chippings should be applied immediately into the wet film. Care should be taken not to over-chip and to ensure that the chippings cover the film shoulder-to-shoulder. Leave the completed surface dressing for at least 72 hours and then lightly brush off any excess chippings. Do not leave any black film exposed.

All tools should be cleaned immediately after use with Sika® Wonder Wipes or white spirit. Any spillage should be wiped off surfaces before the bitumen has set.