Thermaflex thermal insulation THERMAWOOL 28/20 mineral wool 1 m roll (DWZ)

THERMAFLEX THERMAWOOL 28/20 mineral wool in a 1 m roll (DWZ) is a fibrous thermal insulation product designed for pipe, duct and equipment insulation. The product combines mineral wool's inherent fire resistance and stable thermal performance to reduce heat loss and limit noise transmission in HVAC, plumbing and industrial installations. Supplied in a roll format, the insulation is suitable for cylindrical surfaces and can be cut to length for specific applications.

Advantages

Mineral wool composition provides non-combustible insulation with consistent thermal resistance across a range of operating temperatures. The roll format allows for flexible installation around pipes and irregular surfaces and facilitates on-site cutting and shaping. The material offers combined thermal and acoustic performance, and it maintains dimensional stability and long-term insulation properties when installed correctly.

Suitable for

• Thermal insulation of hot and cold water pipes in residential and commercial buildings
• Insulation of HVAC ducts and mechanical equipment to reduce heat loss and noise
• Industrial piping systems requiring fire-resistant insulation
• Renovation projects where preformed rigid segments are impractical

Key specifications

• Material: mineral wool (stone wool)
• Format: 1 meter roll suitable for wrapping around pipes and ducts
• Thickness/profile: 28/20 (nominal dimensions describing roll geometry and wall thickness)
• Thermal performance: stable thermal conductivity typical for mineral wool insulation used in building services
• Fire performance: non-combustible fibrous insulation
• Acoustic properties: reduces noise transmission along pipes and ducts

How to use

Measure the length of pipe or duct to be insulated and unroll the THERMAWOOL to the required length. Cut the roll with a suitable knife or insulation cutter to match the diameter and length of the service. Wrap the mineral wool around the pipe or duct ensuring full contact and consistent coverage, then secure the insulation with bands, tape or cladding as appropriate for the application. For joints and terminations, ensure tight fitting and use suitable sealants or collars if required to maintain thermal continuity and fire performance.

Usage recommendations

For optimal performance, select a thickness and installation method compatible with the operating temperature and environmental conditions of the installation. Use protective outer cladding or vapor barriers where condensation, weather exposure or mechanical damage is possible. Follow local building regulations and safety guidance for handling mineral wool, including the use of gloves and eye protection during cutting and fitting.