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Firestops for External Masonry Walls


  • Fire resistance: up to 5 hours
  • Sound reduction: up to 27dB (Rw)
  • Integral smoke barrier
  • Resilient to accommodate site tolerances without cutting

SIDERISE EW systems have been developed to provide a simple and easy to install method of sealing external wall cavities for both masonry and timber frame constructions.

The standard range has been optimised to include options of materials that are cost-effectively matched to suit the specific performance criteria for all fire stopping requirements. Additionally, the products have excellent sound reduction qualities which can be used to combat unwanted noise via flanking transmission.

These products represent an ideal combination of fully qualified performance, practical installation and cost effectiveness.

Note: This product was previously known as Lamatherm EW systems - cavity barrier, firestop and acoustic barrier solutions for external walls.

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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