Rockwool RockLap 20mm Pipe Insulation 42mm OD

20mm Rockwool RockLap Pipe Insulation (42mm outer diameter) delivers pre-formed stone wool segments engineered for straightforward fitting. Each section arrives pre-slit with a factory-bonded foil facing and integral self-adhesive lap, enabling rapid installation directly onto pipes and sealing with backing tape.

Perfect for protecting heating and ventilation pipework across residential, commercial, and industrial applications, this 20mm insulation has delivered reliable thermal performance across varied climates for more than six decades.

Product specification

• Model: 20mm RockLap
• Thickness: 20mm
• Outer diameter: 42mm
• Length: 1000mm
• Density: 120kg/m3
• Thermal Conductivity: 0.033W/mK
• R-Value: 0.76m2K/W
• Pack quantity: 1
• Fire Rating (Reaction to Fire): A2L-s1, d0
• Resistance to fire: Tested to BS EN 1366-3 to provide up to 120 minutes fire resistance
• Brand: Rockwool

These cylindrical stone wool insulation segments arrive pre-slit for convenient installation, featuring a foil facing with an integral self-adhesive lap for secure bonding.

Key features include

• Non-combustible construction with Euroclass A2L-s1, d0 rating
• Reinforced aluminium foil facing delivering a vapour-resistant barrier
• Self-adhesive foil lap for rapid installation, reducing reliance on additional aluminium tape
• Tested to EN 1366-3 standards for fire resistance of penetration seals, delivering up to EI 120 protection

Applications

Designed for pipework operating between 0°C and 200°C, these sections excel at fire stopping where steel and copper pipes penetrate fire-resistant walls and floors. Continuous installation through separating elements eliminates costly local removal or replacement, saving both time and labour.

Fire performance

• Euroclass A2L -s1,d0. • Tested to EN 1366-3, the harmonised European standard for the fire resistance of penetration seals. • Provide up to 120 minutes* fire resistance integrity and insulation.

Water Resistance

This Rockwool RockLap insulation resists water penetration. When deployed or stored outdoors, protect with a waterproof covering. For cold pipe insulation, seal joints with foil tape to prevent condensation buildup.

Service Temperature

Suitable for pipes operating between 0°C and 250°C, this 20mm Rockwool insulation maintains foil facing bond strength when outer surface temperatures remain below 80°C.

Durability

Rockwool stone wool insulation products demonstrate exceptional resilience and dimensional stability, preserving thickness and shape indefinitely. Performance testing confirms that Rockwool insulation sustains its thermal properties for 65+ years following installation.

More Information on 20mm Rockwool RockLap Pipe Insulation (42mm Outer diameter)

• Manufacturer Link: 20mm Rockwool Rocklap
• Browse our full Rockwool Insulation range and refine by thickness or coverage using the left-hand filters. For project-specific advice or bulk quotations, contact us on +4402038839057, email sales@insulationbee, or use Live Chat - Competitive Rockwool Insulation Pricing.