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KemFlash Roof flashings:


one-component, bitumen-modified polyurethane flashing liquid. It produces a highly elastic waterproofing membrane with excellent adhesion to many types of surfaces, ideal for roof flashings and details where it is difficult to apply sheet membranes.


  • Ready to use, one-component.
  • Simple application by brush, roller or trowel.
  • Makes flashing details easy and secure.
  • No flame required.
  • Conforms to irregular shapes.
  • Forms seamless membrane without joints.
  • Eliminates cutting/gluing and torching.
  • Saves time and money
  • No fasteners or termination bar required. 


All surfaces must be free of oil, grease, moisture, loose particles, curing products, form-work, irregularities, slurry, etc. Roughen PVC pipe with sandpaper. Clean metal surfaces with solvent (eg. acetone, Xylene or Methyl Ethyl Ketone). Metal surfaces should be clean, smooth, free of contamination and oxidisation. Fill surface irregularities with the relevant product if necessary.  


Without primer: Bituminous waterproofing membranes, metal, pre-painted metal, wood, concrete, and PVC pipe.

With primer (Bitumen Primer or KEMSEAL SP1): Built up Roofing

With KEMSEAL WBE PRIMER: Most other roofing and waterproofing substrate surfaces.  


KemFlash is applied with a brush, trowel, or a roller in two KemFlash flashing liquid. It produces a highly elastic waterproofing membrane with excellent adhesion to many types of surfaces, ideal for roof flashings and details where it is difficult to apply sheet membranes. particles, curing products, formwork, irregularities, slurry, etc. Roughen PVC pipe with sandpaper. Clean metal surfaces with solvent (eg. acetone, Xylene or Methyl Ethyl Ketone). Metal surfaces should be clean, smooth, free of contamination and oxidisation. Fill surface irregularities with the relevent product if necessary. layers (minimum), or in three layers when KEMSEAL REINFORCING FABRIC is used. Mix product well before use. Junctions between supports, transitions, joins, and corners must be reinforced with KEMSEAL REINFORCING FABRIC. Apply heavy first layer of KemFlash thick enought to fully saturate the reinforcing fabric. Embed fabric centred over joint and apply a second layer of KemFlash over the fabric. Once this layer is dry and tack free apply a third layer of KemFlash liquid. KemFlash is UV resistant. It can be left exposed without protection. For visual purposes the top coat can be covered with roofing granules (while still wet) or top coat with KEMSEAL PU or S-80 top-coats. Minimum application temperatures: +5oC (41oF) Service Temperature: -40oC to +90oC ( -40oF to 194oF) Do not use if rain or snow is predicted within 2 hours after the installation.

COVERAGE, Average Coverage per Coat:

  • 4.5 (50 sq.ft) per 3.78 ltr (1 gal)
  • 23 (250 sq.ft) per 18.9 ltr (5 gal)
  • 2 (unreinforced) or 3 (fabric reinforced) coats at 0.5-1ltr/ /coat
  • 40-80sq.ft / US gal / coat
  • Coverage rates will vary depending on the porosity of the substrate.  


3.78 ltr (1 US gal) and 18.9 ltr (5 US gal) pails


Can be kept for 12 months minimum in the original pails Opened containers will develop a skin of cured material on top. Un-cured material beneath can be used. For more information refer to relevant Material Safety Data Sheets.


  • Coating type: Bituminous Polyurethane
  • Color: Brown
  • Density ASTM D 1475/EN ISO 2811-1(20°): 1 ,30g/cm3 ±0.05
  • Viscosity ASTM D 2196/EN ISO 3219(25°): 3,500-5,500 cp
  • Packaging: 3.78 Ltr, 18.9 ltr
  • Water Vapour Transmission: 0,8 gr /m2 hours
  • Gloss: Semi Gloss
  • Application Temperature: 5oC and above
  • Temperature resistance: 200 days at 80oC & 150oC Dry (shock)
  • Shelf Life: 12 months in unopened container.
  • Theoretical spreading rate: 2.00 kg/m
  • Hardness ASTM D2240,DIN 53505,ISO R 868: 35 (Shore A)
  • Elongation Percentage (23oC)(ASTM D 412): >/= % 600
  • Tensile Force at Break Break (23oC)(ASTM D 412): >/= 3 N/mm
  • Method of application: Roller, brush, trowel
  • Drying Time:
    • Touch dry: Ready to recoat in 2 hours
    • Dry: 12 Hours
    • Fully Cured: 3+ days
    • Note: Do not exceed 24 hours between coats.


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Waterproofing Primer

Repair and Maintenance