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Rockwool Duct Insulation/Lagging (Duct Wrap)
£64.03
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Rockwool Duct Insulation/Lagging (Duct Wrap) - 50mm (5m² per pack) is backordered and will ship as soon as it is back in stock.
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Rockwool Duct Insulation/Lagging (Duct Wrap)
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Description
Description
ROCKWOOL | HVAC Duct Insulation
ROCKWOOL DuctWrap – Foil-Faced Duct Insulation Roll
ROCKWOOL DuctWrap is a flexible stone wool insulation roll with a factory-applied reinforced aluminium foil facing. Designed primarily for thermal insulation of circular ventilation ductwork, it provides reliable insulation for HVAC, air-conditioning, warm-air and extract duct systems.
With a declared thermal conductivity of 0.034 W/mK at 10°C and Euroclass A1 reaction-to-fire classification, DuctWrap helps limit heat transfer and supports condensation control when correctly specified and installed.
Available in 25mm, 40mm and 50mm thicknesses. Select the required option above to suit your duct insulation specification.
25–50mm
Thickness Options
0.034
W/mK at 10°C
A1
Non-Combustible
230°C
Max. Service Temp.
Applications & Benefits
Where Can ROCKWOOL DuctWrap Be Used?
Circular HVAC Ductwork
Flexible insulation for circular ventilation ducts used in air-conditioning, warm-air distribution and mechanical extract systems.
Thermal Insulation
Reduces heat transfer through insulated ductwork, with a declared thermal conductivity of 0.034 W/mK at 10°C.
Condensation Control
Helps prevent condensation on chilled ductwork when the correct thickness is selected and the foil vapour barrier is correctly sealed.
Water Storage Tanks
Suitable for thermal insulation of applicable cold-water storage tanks and associated water storage systems, subject to the installation specification.
Thickness & Pack Sizes
Choose Your DuctWrap Thickness
ROCKWOOL DuctWrap is supplied in 1000mm-wide rolls. Pack coverage depends on the selected thickness.
| Specification | 25mm | 40mm | 50mm |
|---|---|---|---|
| Thickness | 25mm | 40mm | 50mm |
| Roll Width | 1000mm | 1000mm | 1000mm |
| Roll Length | 5m | 4m | 5m |
| Rolls Per Pack | 2 | 2 | 1 |
| Coverage Per Pack | 10m² | 8m² | 5m² |
Roll dimensions follow ROCKWOOL's March 2026 datasheet. Pack quantities and coverage follow the Insulation & More product options. Allow for cutting and installation waste.
Technical Specifications
ROCKWOOL DuctWrap Product Information
| Manufacturer | ROCKWOOL |
|---|---|
| Product | DuctWrap |
| Material | Flexible stone wool insulation |
| Facing | Reinforced aluminium foil |
| Available Thicknesses | 25mm / 40mm / 50mm |
| Roll Width | 1000mm |
| Thermal Conductivity | 0.034 W/mK at 10°C |
| Reaction to Fire | Euroclass A1 |
| Maximum Service Temperature | 230°C |
| Maximum Outer Foil Temperature | 80°C |
| Product Standard | EN 14303:2009+A1:2013 |
| Declaration of Performance | RWUK-CE-0109-05 |
Properties are based on ROCKWOOL's official DuctWrap and DuctSlab technical information. Thermal conductivity varies with operating temperature. Insulation thickness must be selected so that the outer foil surface does not exceed 80°C.
Buying Guide
How Much DuctWrap Do You Need?
For circular ductwork, calculate the developed wrap length using ROCKWOOL's formula:
L = 3.14 × (OD + 2t)
OD = duct outside diameter
in metres
t = insulation thickness
in metres
L = approximate wrap length
around the insulated duct.
Multiply L by the total straight duct run length to estimate the insulation area, then divide by your selected pack coverage.
| Thickness | Pack Coverage |
|---|---|
| 25mm | 10m² |
| 40mm | 8m² |
| 50mm | 5m² |
Estimating guidance only. Allow additional material for bends, joints, branches, supports and cutting waste. Do not select insulation thickness using area calculations; thickness depends on thermal and condensation-control requirements.
Installation Guidance
Installing ROCKWOOL DuctWrap
Wrap & Support
Apply the insulation around the ductwork using appropriate support and fixing arrangements. Avoid excessive compression, which reduces effective insulation thickness.
Seal Aluminium Foil Joints
ROCKWOOL specifies a minimum 75mm-wide suitable soft aluminium self-adhesive tape for applicable joints to maintain foil facing continuity.
Chilled Ductwork
Below-ambient systems require a continuous vapour barrier. Seal exposed edges, joints and any fixing penetrations in accordance with the manufacturer's guidance.
External Installations
Provide suitable weatherproof protection for external ductwork. The aluminium foil facing alone should not be relied upon as complete weatherproof cladding.
Related Products
Complete Your Duct Insulation Project
Need rigid insulation for rectangular ductwork, installation accessories or protective finishing materials? Explore the related products below.
Technical Resources
Official ROCKWOOL Product Information
Review ROCKWOOL's specifications, installation instructions and supporting technical documentation. The DuctWrap and DuctSlab products share a combined manufacturer datasheet.
Frequently Asked Questions
ROCKWOOL DuctWrap FAQs
What is ROCKWOOL DuctWrap used for?
DuctWrap provides thermal insulation for circular ventilation ductwork, including air-conditioning, warm-air and extract systems. It can also be used for suitable water storage tanks.
What is the difference between DuctWrap and DuctSlab?
DuctWrap is a flexible stone wool insulation roll designed primarily for circular ductwork. DuctSlab is a semi-rigid insulation slab designed for square and rectangular ducts. Both feature reinforced aluminium foil facing.
What sizes of DuctWrap are available?
We offer 25mm, 40mm and 50mm thicknesses. The listed pack coverage is 10m² for 25mm, 8m² for 40mm and 5m² for 50mm.
Which DuctWrap thickness should I choose?
Selection depends on duct air temperature, ambient conditions, heat-loss requirements and condensation risk. Refer to the relevant BS 5422 guidance and the project specification.
Can DuctWrap prevent condensation?
Correctly specified DuctWrap can help prevent condensation on chilled ducts when the insulation thickness is adequate and the reinforced foil vapour barrier is continuous and sealed.
Is ROCKWOOL DuctWrap non-combustible?
Yes. ROCKWOOL DuctWrap has Euroclass A1 reaction-to-fire classification. This does not automatically establish a fire-resistance rating for the complete ductwork system.
Can DuctWrap be installed outdoors?
Yes, where a suitable external insulation system is specified. Appropriate weatherproof protection, fixings and joint sealing are required.
What is the maximum service temperature?
ROCKWOOL states a maximum service temperature of 230°C. The insulation must be specified to keep the outer foil surface at or below 80°C to maintain the facing bond.
Insulation & More | Trade Supply
Need Duct Insulation for a Trade Project?
We supply ROCKWOOL, PAROC and specialist duct insulation materials for HVAC installers, M&E contractors, mechanical insulation specialists and commercial projects.
Contact our team for product selection assistance, project quantities and commercial enquiries.
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