• Envirograf RSF Rainscreen Cavity Barriers
  • Envirograf RSF Rainscreen Cavity Barriers

Envirograf RSM Rainscreen Cavity Barriers

Product 55 - RSM

We no longer stock this product, but can recommend Tenmat VFB Plus Ventilated Fire Barrier as our nearest alternative. Please contact our Technical Team on 0113 2455450 (option 2) or send a message to [email protected] prior to purchase/use for advice on suitability.



RSM Rainscreen Cavity Barriers for rainscreen & cladding; intumescent-impregnated fireproof sponge with water-resistant red cover. Ventilation holes or front-facing intumescent strip for gaps up to 50mm wide available.

  • Refer to sizes below
    • Ventilation holes only available with RSM/A/
  • 1m long
  • Use horizontal or vertical
  • Easy fix with screws or nails
  • Non-fibrous


All cavity barriers supplied in 1 metre lengths, with 3 fixing brackets.

40mm thickness provides up to an hour of fire protection

50mm thickness provides up to 2 hours of fire protection

RSF Non-Ventilated

Ref Width Thickness
RSM150 150mm 40mm/50mm
RSM180 180mm 40mm/50mm
RSM200 200mm 40mm/50mm
RSM250 250mm 40mm/50mm
RSM300 300mm 40mm/50mm

RSF/I with Intumescent - in the front face which expands up to 50mm so a ventilation gap
from 20mm to 50mm can be left.

Ref Width Thickness
RSM/I/150 150mm 40mm/50mm
RSM/I/180 180mm 40mm/50mm
RSM/I/200 200mm 40mm/50mm
RSM/I/250 250mm 40mm/50mm
RSM/I/300 300mm 40mm/50mm

RSF/A with Ventilation Holes - with intumescent holes to give ventilation & allow moisture through.

Ref Width Thickness
RSM/A/150 150mm 40mm/50mm
RSM/A/180 180mm 40mm/50mm
RSM/A/200 200mm 40mm/50mm
RSM/A/250 250mm 40mm/50mm
RSM/A/300 300mm 40mm/50mm

The ventilation option can be made with 1 or 2 rows of intumescent holes.

Envirograf RSM Rainscreen Cavity Barriers are especially designed for use with rainscreens and other types of cladding, made from impregnated intumescent fireproof sponge for a thinner barrier with a better fire rating. The barriers are easy to fix, with brackets already in place for use with nails, screws or split nails up to 12mm, and require no masks as they are non-fibrous. Use the cavity barriers in horizontal or vertical positions.

The barriers are available with ventilation options such as holes that seal up in the case of fire, or with a front-facing intumescent strip. The front-facing options allows ventilation in front of the barrier, with the face expanding in a fire to seal a gap of up to 50mm to prevent the spread of fire and smoke for a limited time.

Examples of use

Rainscreen cladding has become the preferred choice for most architects, particularly in high-rise buildings as it provides flexibility in design as well as superior weather protection against the elements. Using rainscreen cavity barriers helps overcome the challenge of providing a ventilated system that allows facades to function, allowing movement of air whilst ensuring that cavities have the fire protection that makes these high-rises as safe as traditional low-rise buildings.

Intumescent-impregnated/clad cavity barriers allow air flow and then seal up during a fire, preventing the spread of fire and smoke in a building and allowing more time for evacuation, as well as containing damage to ensure structural integrity.


This barrier comes supplied with 3 fixing brackets which can be simply screwed, nailed or spit nailed to
the internal wall (pre-drilled holes are suitable for up to 12mm size screws). The barrier can be easily cut with a sharp knife. If during installation you find wall imperfections, these can then be filled with Envirograf Intumescent Mastic (Product 58).

Envirograf Fire Cavity Barriers should be fitted by experienced professionals to ensure they are installed correctly. Products can only be guaranteed by Envirograf if fitted correctly and incorrect installations will be condemned if inspected. Check labels, fixing brackets, manufacturer installation instructions, etc. Should a site visit be required to check installation, this can be arranged upon request but will be chargeable.

IMPORTANT FIRE PRODUCTS NOTICE: The information displayed on this website should be used as a guide ONLY and our Technical Department should be contacted to obtain a tailored specification and any advice necessary before you place an order for fire protection products. Fire protection products are non-returnable except in accordance with Condition 8 of the Terms and ConditionsWe will not be held liable for any resulting damage to property, human life or monetary costs incurred due to the incorrect specification you have prepared or use of fire protection products caused by your negligence, including your failure to have contacted us to obtain the relevant advice/specification.

Any Envirograf products to be used in or for Harrods department store should be authorised with our Technical Team prior to purchase.

Product Details
Product 55 - RSM

Customer agrees that before placing an Order, Customer has read and understood the most up to date Product Data Sheet for the Product. Where we have access to the Product Data Sheet from the manufacturer, we will either provide a copy on request, or include a link to the Product Data Sheet available on the manufacturer’s website. Customer further agrees that we have no liability for any errors or omissions contained within the Product Data Sheets. For more information, please see our Terms & Conditions of Sale.

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