Nullifire FV065 Small Ventilated Cavity Barrier Roll is used within external wall cavity, to reinstate fire resistance performance, of ventilated cavities, for up to 60 minutes for cavity widths of up to 65mm, in fire conditions.

The product will act as an external wall cavity barrier at the required locations such as compartment floors, around windows, doors, etc. and within uninsulated cavities requiring permanent (open-state) ventilation.

In the event of a fire FV065’s intumescent material will expand to close the external wall cavity, providing effective fire resistance, for integrity and insulation for up to 60 minutes depending upon the construction of the external walls.

FV065 is designed to close off a total cavity of 65mm which allows for building tolerances of up to 15mm (above the typical maximum cavity ventilation requirements of 50mm).

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• Features & Benefits
• Necessary Tools & Preparation
• Fixings & Installation
• Important Information
• Technical Information
• Maintenance
• Typical Details

Features & Benefits

   
• Used within external wall cavity, to reinstate fire resistance performance, of ventilated cavities, for up to 60 minutes for cavity widths of up to 65mm, in fire conditions
• Acts as an external wall cavity barrier at the required locations such as compartment floors, around windows, doors, etc. and within uninsulated cavities requiring permanent (open-state) ventilation
• Suitable for masonry and brickwork external substrates
• Ventilated design – developed to allow maximum ventilation of uninsulated cavities reducing the need for cavity trays or weepholes
• Suitable for ventilated cavities up to 65mm wide, including building tolerances of up to 15mm
• Lightweight - easy & quick to install
• Provided in rolls of 6.3m long offering space and labour savings
• Moisture resistant packaging
• No maintenance required after installation

Necessary Tools & Preparation

Necessary Tools

• Masonry drill
• Screwdriver
• Saw/knife for cutting product
• Measuring tape
• Stainless steel fixings suited to the substrate

Preparation

• Ensure the installation area is free from dust, oil and any corrosive material
• Check the mounting substrate is solid and free from damage and degradation before beginning
• Double check for any obstructions, ensure that if there are any that could allow fire to pass vertically, they are fire stopped separately using an approved and applicable Fire Stopping product

Fixings & Installation

Fixings:

• Fixings (suitable screws or nails) must be fixed at maximum 40 mm from the end of the fire barrier and then at maximum 300mm centres
• Screws:
  • When fixing directly into substrates other than OSB is Staple Fixed, stainless steel screws must be used
  • The diameter of the screw head should be a minimum of 5mm and a maximum width of 11.5mm, the length of the screw should be a minimum of 50mm
• Nails:
  • Nail guns may be used; however the firing pressure should be carefully controlled to ensure that the stainless steel nail does not push through the fire barrier
  • The nail head diameter must be a minimum 5mm and maximum 11.5mm, the nail should be a minimum of 50mm long

Pre-Installation:

Before FV065 is installed the following information is required to ensure that the selected product is approved for use in the actual construction being utilised.

• The type of construction being utilised, e.g. timber inner leaf and masonry outer leaf. Please note, FV065 is not suitable for use behind outer leaf designs of cladding, weatherboard and similar non-masonry/brickwork materials. Consult with our Technical Support for a suitable product for other outer leaf types on 0113 2455450 (option 2) or send a message to [email protected]
• The required fire resisting performance of the cavity barrier, typically 30 minutes for integrity and 15 minutes for insulation (30/15 EI). Table B3 item 17 of Approved Documents (Fire Safety) B1+B2:2020 (England and Wales)
• The orientation of the cavity barrier, horizontal or vertical. For vertical applications, please consult our Technical Team for appropriate product
• The cavity size and the building tolerances of the cavity (for example, 50mm designed cavity and building tolerance 10-15mm)
• Take account of any insulation within the cavity, if insulation is required within the cavity please seek additional advice from our Technical Support as FV065 is not suitable for this application
• When the above information is obtained then this can be cross referenced with FV065 product approvals table to ensure that the product selection is correct. The product selected should be confirmed as being approved by the person responsible for design, for example architect and or fire engineer

Installation:

• Ensure that the polythene sleeve fully covers the free end of the roll, if the intumescent material is visible pull the polythene sleeve back to reveal the intumescent material and cut enough of the intumescent material away to allow at least 50mm of the polythene to be folded back behind the face of the roll
• Once in position, ensure that the end of the roll is tightly butted up to the correct construction detail, then apply the first fixing within 40mm of the beginning of the roll on the centre line of the roll
• Continue along the centre line of the roll applying fixings at maximum 300mm centres (suitable screws/nails) or 150mm centres
• If a new roll is required to complete the required run, follow first 2 bullet points ensuring that the two ends of the intumescent material within the polythene sleeve are closely butted together and then continue with bullet point 3
• Once the end of the required run is within 500mm of the finish point, carefully mark the position required for the intumescent material, trim the polythene sleeve 50mm longer than required, pull the sleeve back to uncover the intumescent material, double check the required barrier length and trim the intumescent as required, to form a tight fit against the construction detail. Pull the polythene sleeve back over the intumescent material and fold back the 50mm overcut polythene sleeve, using weather resistant tape, to the rear of the barrier
• Ensure the final fixing is within 40mm of the end of the roll

Important Information

• Before placing an order, please complete the Nullifire Project Questionnaire for suitable product recommendation and presentation to the principal designer for acceptance
• FV065 should freely face into the cavity and should be installed horizontally in a continuous band across the floor level of the building in line with the compartment floors
• The correct positioning should be confirmed with the persons responsible for the design of the project
• All joints must be tightly butted together so that the intumescent material is continuous throughout the cavity
• Obstructions such as rails or timber battens should not interrupt, encase or cover FV065, battens and rails should be cut either side of the fire barrier
• FV065 is not designed for use within cavities where insulation is required to be installed. More suitable alternatives are available from the Nullifire product range
• Not approved for use behind cladding/weather-boarding
• Approved for use behind masonry/brickwork (FV065 must be unobstructed to allow for free expansion)

Technical Information

Maintenance

• No active maintenance required
• Where alterations are made around the product it should be checked visually to ensure that the product is still installed as per the approved original design and fitting instructions at the time of original installation

Typical Details

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 Conditions and should be applied only by an individual with the necessary expertise and experience. We 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.