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Bostik Bituminous Mastic All Weather Waterproofer Black 5L
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Bostik Bituminous Mastic All Weather Waterproofer Black 5L

SKU: BW-22715 MFC: 30811916

Product Description

Complete the construction of your roof with the help of this Bostik Bituminous Mastic All Weather Trowel For Roofs Black 5L. The product is a trowel-grade, multipurpose mastic that can be used for everything from bedding, pointing, waterproofing, stopping and sealing your roofs. This product is safe and effective when used on mastic asphalt, fibre cement, corrugated iron, lead, slate, concrete and copper, making it great for almost any kind of roof. It can easily be applied using either a putty knife or a steel trowel so long as it is applied over a dry, clean surface.

  • Manufacturing code of this product is 30811916
  • Black in colour
  • Bostik Bituminous Mastic for Roofs is a multi-purpose trowel grade bituminous material for waterproofing, stopping, bedding, pointing and sealing
  • It can be applied to mastic asphalt, roofing felt, corrugated iron, cast iron, fibre cement, slates, lead, copper, zinc, concrete and timber
  • Bostik Bituminous Mastic for Roofs dries to a flexible black material which remains soft and pliable for a long time after application
  • Normally applied with a steel trowel or putty knife over a clean, dry surface.

+ Delivery & Returns
  • Smart Advantages:
  • Fibre Reinforced Mastic
  • Immediately Resistant to Rainfall
  • Highly resistant to weathering
  • Fills, Seals, repairs
  • For bedding, pointing, sealing
  • For asphalt and felt roofs.


  • Colour
  • Black
  • Form
  • Trowellable paste
  • Specific Gravity
  • 1.45 approx
  • Composition
  • Filled bitumen solution in white spirit containing a non-drying oil
  • Application Temperature
  • +5°C to +40°C
  • Temperature Resistance
  • -10°C to +85°C
  • Coverage
  • Approx. 3 litres per 1m2 giving 2mm wet thickness
  • Heat Flow Resistance
  • The cured film will not sag or flow under normal conditions

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