Roof Surface Types

• Gravel Roof Surface
  
• Aluminum Roof Surface
  
• Metal Roof Surface
  
• Solvent Base Cements, Coatings And Adhesives
  
• Emulsion (water base) Coatings

Gravel Roof Surface Preparation:
BUR - Gravel (resurfacing)

Remove all loose gravel, dirt, dust and foreign matter that may inhibit adhesion of the coating by vacuuming, sweeping, power-brooming or power washing. If needed, repair all flashings, roof penetrations, blisters and delaminations. Surface should be dry before coating.

Note: This type of system normally requires the use of either a roof resaturant (Asphalt or Cold Tar base) or a Cold Process Cement. Resaturants require re-graveling (Approx. 400lbs. / 100 sq.ft.).

Aluminum Roof Surface Preparation:
BUR (Smooth), SBS, Roll Roofing and APP

All surfaces should be clean, dry and free of dust, Dirt, oil and other foreign matter by employing one of the above-mentioned methods. Repair all cracks and blisters.

Note: New steep asphalt roofs should be allowed to weather a minimum of 90 to 180 days and 0 to 30 days for Modified membranes (contact membrane manufacturer for details) prior to application of the aluminum coating. Coating may commence sooner than the prescribed weathering period if, the surface is first coated with a clay base emulsion and allowed to fully cure 5 to 10 days.

Metal Roofing:

The metal deck should be free of rust, scale, oil and grease, prior to the application of any Karnak metal roof system. All rust or scale may be removed by wire-brushing, power washing or sand blasting. Power-wash shall consist of a minimum of 2,000 psi water pressure in order to remove all contaminants from the roof surface. Metal roofing should be allowed to completely dry prior to application of any primer or coating.

Solvent Base Cements, Coatings And Adhesives Surface Preparation:
BUR (Smooth), SBS, Roll Roofing

All surfaces should be clean, dry, and free of dust, dirt, oil and other foreign matter by employing one of the above- mentioned methods. Repair all cracks and blisters.

Emulsion (water base) Coatings Surface Preparation:
BUR (Smooth), SBS, Roll Roofing

All surfaces should be clean and free of dust, dirt, oil and other foreign matter by employing one of the above-mentioned methods. Surfaces may be slightly damp when applying emulsion coatings. Repair all cracks and blisters.

For more information, see:
General Surface Preperation Information
Surface Preperation For Waterproofing