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Fire & Acoustic Closer for Party Walls


  • 1 hour fire rating
  • Reduces flanking noise
  • Includes integral DPC
  • Thermal conductivity: λ = 0.035W/m.K

SIDERISE fire & acoustic closer for party walls provides up to 1 hour fire resistance and reduces flanking sound transmission at the junction of compartment and external walls.

Meeting the requirements of Approved Document E (2003 edition) of the Building Regulations, the insulation is supplied in standard lengths and can be readily cut as required.

Note: This product was previously known as Lamatherm FAC fire & acoustic cavity closer / fire & acoustic party wall closer.

Meet the Construction Team

Construction product range

Firestops for Profiled Decks

Custom trapezoidal and profiled firestops for profiled decks offering up to 2 hours fire resistance. Read more

Soffit Liner

A composite insulation system for thermal insulating of soffits. Read more

Firestops for External Masonry Walls

A fire & acoustic cavity barrier for external cavity walls. Read more

Fire & Acoustic Closer for Party Walls

A 1 hour rated fire & acoustic cavity closer with integral DPC. Read more

Firestops for Tops of Walls

A one-piece passive fire insulation product for sealing the cavities formed between the top of compartment walls and the underside of the construction above, preventing the spread of fire and smoke and reducing sound transmission. Read more

Rockwool® Slabs

Versatile thermal acoustic insulation slabs are high quality resin bonded slabs that can be used for thermal, acoustic and fire insulation. Read more


A variety of ancillaries form part of the SIDERISE insulation range and are available to order. Read more


Technical resources

Make an enquiry

Whatever your insulation requirement, whether you are in the construction, marine, transport or energy generation sector, we can provide technical advice and a tailored insulation solution.

Talk to our Construction Team who will be happy to have a look at your project.

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