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The Cementone All Weather Bitumen Mastic from Bostik is a high-performance, trowel-grade bituminous sealant, perfect for a wide range of roofing and waterproofing applications. Supplied in a 5-litre pack, this versatile black mastic is designed to bond and seal across a variety of materials, including mastic asphalt, roofing felt, corrugated iron, cast iron, fiber cement, concrete, lead, timber, and more.
Formulated to stay soft and pliable over time, this bitumen mastic develops a durable surface skin while maintaining flexibility underneath—allowing for moderate movement and long-term protection. It also contains reinforcing fibers for added strength and performance, making it ideal for pointing, bedding, sealing, and filling on both new installations and repair jobs.
Whether you're tackling leaks, sealing gaps, or weatherproofing exposed areas, Cementone All Weather Mastic offers a reliable, weather-resistant seal that performs in even the toughest outdoor conditions.
Features & Benefits
Multi-purpose bituminous compound – trowel-applied for ease of use
Ideal for waterproofing, stopping, sealing, bedding, and pointing
Suitable for use on metal, concrete, timber, roofing felt, and more
Forms a flexible, waterproof seal while remaining soft underneath
Designed for all weather conditions – resists cracking and shrinking
Reinforced with added fibers for greater strength and stability
Perfect for sealing gutters, downpipes, joints, and roofing overlaps
Size: 5 Litres – ready to use, no mixing required
Product Specifications
Brand: Bostik
Range: Cementone
Product Type: Roofing Chemical / Bitumen Mastic
Manufacturer Code: 30811916
Colour: Black
Pack Size: 5 Litres
Weight: 7.44 kg
Height: 233mm
Width: 179mm
Length: 179mm
Ideal For:
Waterproofing flat roofs, joints, and flashings
Sealing around gutters, vents, downpipes, and skylights
Bedding and pointing roofing felt, tiles, and corrugated sheets
Filling gaps and cracks in roofing, metalwork, and masonry
Use in domestic, commercial, and industrial roofing projects
Why Choose Cementone All Weather Bitumen Mastic?
Trusted by professionals across the building trade, Cementone All Weather Mastic is a go-to solution for waterproofing and roofing that delivers long-lasting flexibility, adhesion, and protection. Whether you're working in dry or damp conditions, its advanced formulation ensures your repairs or installations hold strong, season after season.
The Cementone All Weather Bitumen Mastic from Bostik is a high-performance, trowel-grade bituminous sealant, perfect for a wide range of roofing and waterproofing applications. Supplied in a 5-litre pack, this versatile black mastic is designed to bond and seal across a variety of materials, including mastic asphalt, roofing felt, corrugated iron, cast iron, fiber cement, concrete, lead, timber, and more.
Formulated to stay soft and pliable over time, this bitumen mastic develops a durable surface skin while maintaining flexibility underneath—allowing for moderate movement and long-term protection. It also contains reinforcing fibers for added strength and performance, making it ideal for pointing, bedding, sealing, and filling on both new installations and repair jobs.
Whether you're tackling leaks, sealing gaps, or weatherproofing exposed areas, Cementone All Weather Mastic offers a reliable, weather-resistant seal that performs in even the toughest outdoor conditions.
Features & Benefits
Multi-purpose bituminous compound – trowel-applied for ease of use
Ideal for waterproofing, stopping, sealing, bedding, and pointing
Suitable for use on metal, concrete, timber, roofing felt, and more
Forms a flexible, waterproof seal while remaining soft underneath
Designed for all weather conditions – resists cracking and shrinking
Reinforced with added fibers for greater strength and stability
Perfect for sealing gutters, downpipes, joints, and roofing overlaps
Size: 5 Litres – ready to use, no mixing required
Product Specifications
Brand: Bostik
Range: Cementone
Product Type: Roofing Chemical / Bitumen Mastic
Manufacturer Code: 30811916
Colour: Black
Pack Size: 5 Litres
Weight: 7.44 kg
Height: 233mm
Width: 179mm
Length: 179mm
Ideal For:
Waterproofing flat roofs, joints, and flashings
Sealing around gutters, vents, downpipes, and skylights
Bedding and pointing roofing felt, tiles, and corrugated sheets
Filling gaps and cracks in roofing, metalwork, and masonry
Use in domestic, commercial, and industrial roofing projects
Why Choose Cementone All Weather Bitumen Mastic?
Trusted by professionals across the building trade, Cementone All Weather Mastic is a go-to solution for waterproofing and roofing that delivers long-lasting flexibility, adhesion, and protection. Whether you're working in dry or damp conditions, its advanced formulation ensures your repairs or installations hold strong, season after season.
