Rockwool Pipe Insulation
Rockwool Pipe Insulation — Fire Protection & Thermal Performance
Rockwool pipe insulation is the preferred choice for commercial and industrial applications where fire protection, acoustic performance and high-temperature resistance are critical. Made from stone wool, Rockwool products are non-combustible and carry an A1 Euroclass fire rating — the highest possible classification. We are authorised UK distributors for the full Rockwool range.
Rockwool Product Range
- Rocklap Pipe Insulation — Foil-faced mineral wool pipe sections for mechanical services, HVAC and industrial pipework. One of the UK's most widely specified pipe insulation products for high-temperature applications. Available in a wide range of bore sizes and wall thicknesses.
- Rockwool Pipe Sections — Pre-formed mineral wool sections for hot and cold pipework insulation in commercial buildings and industrial plant rooms.
- Rockwool FirePro Products — Specialist fire stopping and passive fire protection products including intumescent pipe collars, pipe wraps, sealants and fire duct slabs. Essential for compartmentation in commercial buildings.
- Rockwool Duct Insulation — Duct wrap and duct slab products for HVAC ductwork insulation, fire protection and acoustic control.
Why Choose Rockwool Pipe Insulation?
- A1 non-combustible — will not contribute to fire spread under any conditions
- Suitable for high-temperature applications up to 750°C
- Excellent acoustic performance — reduces airborne and impact noise transmission
- Dimensionally stable — will not shrink, sag or settle over time
- Moisture resistant — maintains thermal performance in damp conditions
- Widely specified by M&E engineers and approved by building control
- Compliant with Part L, BS 5422 and CIBSE Guide C
Rockwool vs Armaflex — Which Should You Choose?
Rockwool and Armaflex are both widely used pipe insulation products, but they serve different applications. Use the guide below to choose the right product for your project.
| Factor | Rockwool Rocklap | Armaflex EVO |
|---|---|---|
| Fire classification | Euroclass A1 (non-combustible) | Class O (limited combustibility) |
| Max temperature | Up to 750°C | Up to 105°C |
| Flexibility | Rigid sections | Flexible foam |
| Vapour resistance | Low (open fibre) | High (closed-cell) |
| Best for | Steam, high-temp process, fire-rated specs | Chilled water, HVAC, condensation control |
| Acoustic performance | Excellent | Good |
If your specification requires A1 non-combustible insulation or involves pipework above 105°C, Rockwool is the correct choice. For chilled water, refrigeration or condensation control, Armaflex is more appropriate.
Common Applications
- Steam and high-temperature process pipework
- District heating mains and energy centre pipework
- Commercial HVAC hot water flow and return
- Industrial plant room pipework
- Fire-rated pipe penetrations and compartmentation
- Acoustic pipe lagging in commercial buildings
- Ductwork insulation and fire protection
Compliance & Standards
Rockwool pipe insulation supports compliance with the following UK standards and regulations:
- Part L (Building Regulations) — Minimum insulation thicknesses for heating and hot water pipework
- BS 5422 — Specification for thermal insulating materials for pipes, tanks, vessels and ductwork
- CIBSE Guide C — Reference data for mechanical services including pipe insulation thickness tables
- Euroclass A1 — Non-combustible classification under EN 13501-1
Shop by Pipe Size
Rockwool Rocklap is available for all standard pipe sizes. Select your bore size below:
15mm | 22mm | 28mm | 35mm | 42mm | 54mm | 76mm | 108mm
Related Collections
Frequently Asked Questions
What is Rockwool Rocklap pipe insulation?
Rockwool Rocklap is a foil-faced mineral wool pipe section used to insulate commercial and industrial pipework. It is non-combustible (Euroclass A1), suitable for temperatures up to 750°C, and widely specified for steam, high-temperature hot water and district heating pipework.
Is Rockwool pipe insulation fire rated?
Yes. Rockwool pipe insulation achieves Euroclass A1 — the highest fire classification under EN 13501-1. This means it is non-combustible and will not contribute to fire spread. It is the correct choice for specifications requiring A1 or non-combustible insulation.
What temperature can Rockwool pipe insulation withstand?
Rockwool Rocklap is suitable for continuous service temperatures up to 750°C, making it appropriate for steam pipework, high-temperature process pipes and district heating systems where elastomeric foam insulation would not be suitable.
What is the difference between Rockwool and Armaflex?
Rockwool is a rigid mineral wool product with A1 non-combustible fire classification, suitable for high temperatures up to 750°C. Armaflex is a flexible closed-cell elastomeric foam with Class O fire rating, suitable up to 105°C and preferred for chilled water, refrigeration and condensation control applications. The right choice depends on your pipe temperature and fire specification requirements.
Does Rockwool pipe insulation comply with Part L?
Yes. Rockwool pipe insulation can be specified to meet Part L minimum thickness requirements for heating and hot water pipework. Our technical team can advise on the correct thickness for your application and pipe size.
Do you stock Rockwool for all pipe sizes?
Yes — we stock Rockwool Rocklap for a wide range of standard pipe bore sizes. If you need a size not shown online or require large quantities, contact our technical team on 0161 775 1190 (Mon–Fri 8am–4pm) for availability and pricing.
Technical Support
Our technical team can advise on Rockwool product selection, insulation thickness calculations and compliance with Part L, BS 5422 and CIBSE Guide C. Call 0161 775 1190 (Mon–Fri 8am–4pm) or use our online enquiry form.
