Mayplas Thermafire A2 Soffit achieves A2 fire classification
Iain Hoey
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New soffit product meets UK fire safety standard
Mayplas has announced that its recently launched Thermafire A2 Soffit has achieved an A2-s1,d0 Reaction to Fire classification under BS EN 13501-1.
The company stated that the slab, designed to provide both thermal and acoustic insulation, is suitable for use within the soffit at the party wall junction and other areas of construction.
According to Mayplas, the product was introduced in March 2025 and has now been confirmed to meet the A2 classification for limited combustibility.
Insulation performance supports UK building regulations
The company said the Thermafire A2 Soffit is available in various densities and in both 100mm and 150mm thicknesses.
It added that these options allow flexibility in meeting thermal performance requirements set out in Approved Document L.
Mayplas noted that the product is compatible with both masonry and timber frame constructions.
Acoustic properties and installation features
Mayplas reported that the product also addresses sound transmission in line with Approved Document E.
According to the company, standard 600mm x 600mm slabs can be cut on site to fit soffit voids.
It explained that the soffit can be secured to timber trusses or masonry blocks using the correct fixings, which Mayplas is able to supply.
Fire performance and market application
Michael Hunter, Technical Director at Mayplas, said the classification supports wider use in construction: “Achieving an A2-s1, d0 Reaction to Fire classification for our Thermafire soffit product is proving very useful.
“The test results open up new applications which we look forward to exploring with our housebuilder customers and with the construction industry more broadly.”
Mayplas stated that the foil facing of the product acts as a vapour barrier and prevents fibre migration.
The company confirmed the product is suitable for timber-based substrates and can be used with or without a cavity.
Mayplas Thermafire A2 Soffit achieves A2 fire classification: Summary
Mayplas has launched the Thermafire A2 Soffit.
The product was released in March 2025.
The company has confirmed that it has achieved A2-s1,d0 classification under BS EN 13501-1.
Mayplas stated the soffit provides thermal and acoustic insulation at party wall junctions.
It is available in multiple densities and in thicknesses of 100mm and 150mm.
The company said the product complies with Approved Documents L and E.
Slabs can be cut to size on site to fit soffit voids.
The product is foil faced to create a vapour barrier and stop fibre migration.
It can be used with masonry and timber frame builds.
Mayplas is based in Bury, Greater Manchester.
It is a member of the Association for Specialist Fire Protection and the Structural Timber Association.
