ROCKWOOL Comfort Liner: Fire, Thermal, and Acoustic Performance for Concrete Soffits

Concrete soffits in car parks, transport hubs, and service areas must satisfy fire, thermal, and acoustic requirements at the same time. Hard surfaces, large ceiling spans, vehicle traffic, and temperature variation all contribute to a demanding performance environment. ROCKWOOL Comfort Liner is a stone wool soffit lining designed to address these three requirements within a single system, reducing the need to specify and coordinate separate products for the same surface.

The Performance Challenge in Car Parks and Transport Facilities

Car parks and transport corridors share conditions that make soffit specification particularly complex: high occupant traffic, large uninterrupted ceiling areas, exposure to vehicle exhaust and heat, and constant background noise. Fire risk from vehicles, thermal transfer between conditioned and unconditioned zones, and sound reverberation off hard surfaces all need to be managed. Addressing each with a separate system adds specification complexity, installation time, and coordination risk. Comfort Liner brings these requirements under one product.

Fire Resilience

ROCKWOOL Comfort Liner is manufactured from stone wool, a non-combustible material with a melting point above 1,000°C, tested to ASTM E794. Because stone wool does not contribute fuel to a fire, it helps limit flame spread across the soffit and supports compliance with fire safety codes in car parks and transport infrastructure. 

Auckland International Airport is one example where soffit areas required a lining capable of meeting fire, thermal, and acoustic criteria simultaneously within a single system.

Thermal Performance

Exposed concrete conducts heat readily, which can result in energy loss in adjacent conditioned spaces. Comfort Liner reduces heat transfer through the soffit, helping to stabilise temperatures in occupied areas and lower the demand on heating and cooling systems. For architects working on transitional or service zones, this thermal resistance supports building energy performance targets without requiring a separate insulation layer.

Acoustic Performance

Concrete soffits, floors, and walls reflect sound rather than absorb it. In large, hard-surfaced environments, this amplifies vehicle noise, footsteps, and mechanical equipment. The fibrous structure of stone wool absorbs sound energy, reducing reverberation and improving acoustic conditions for occupants and staff. In transport facilities particularly, controlled background noise supports clearer communication and a better occupant experience.

Consolidated Soffit Specification

ROCKWOOL Comfort Liner delivers fire resistance, thermal control, and acoustic absorption through a single soffit lining. For architects and designers working in car parks, transport infrastructure, and service areas, this consolidated approach simplifies specification while meeting the performance demands of these environments.

Frequently Asked Questions

What is ROCKWOOL Comfort Liner used for?

Comfort Liner is a lining for exposed concrete soffits in car parks, transport facilities, and service areas. It provides fire resistance, thermal insulation, and acoustic absorption in one product.

Is ROCKWOOL Comfort Liner combustible?

No. Comfort Liner is manufactured from stone wool, a non-combustible material with a melting point above 1,000°C, tested to ASTM E794.

Does Comfort Liner require additional acoustic treatment?

In most soffit applications, Comfort Liner's stone wool composition provides sufficient sound absorption to reduce reverberation without additional acoustic layers.

Where has ROCKWOOL Comfort Liner been installed?

Comfort Liner has been applied in transport infrastructure projects, including soffit areas at Auckland International Airport, where fire, thermal, and acoustic performance were required from a single lining system.