Nullifire FB770 Intudeck


    Nullifire (Firetherm) FB770 Intudeck 140kg, a rock mineral fibre board coated with smoke and fire resistant sealant, provides up to 90 minutes fire resistance under timber floors and is ideal for installing above ceilings that can't be disturbed, such as decorative or made from lath and plaster.

    • 1200 x 600 x 70 mm size
      • Contact our sales team on 0113 2455450 if custom sizes required
    • Simple installation method
    • Contributes to acoustic upgrade
    • Optifire technology identification

    £38.22(ex. VAT)
    £45.86 (inc. VAT)
    Please choose your colour
    Available for Delivery (See Delivery Options Below)

    The minimum purchase order quantity for the product is 3.


    Where ceilings cannot be disturbed, such as decorative or made from lath and plaster, fire protection can be installed under the floor above. Nullifire FB770 Intudeck is a rock mineral wool slab coated on one or both sides with a smoke and fire resistant sealant that provides up to 90 minutes of fire protection.

    Supplied in 1200 x 600 x 70 mm sizes with 140 kg/m³ density; please contact our sales team on 0113 2455450 if you require a custom size.

    These fire batts are lightweight and quick to install, cutting easily to the desired size on-site. Fit between joists underneath floorboards, using compression and Intumastic bonding, to upgrade the fire resistance of timber floors. Services such as combustible pipework, steel pipework and cables can be accommodated - please contact our technical team on 0113 2455450 for detailed solutions.

    Nullifire FB770 Intudeck is ideal for fire protection properties with inaccessible ceilings spaces, either due to occupancy or mechanical services, in small and large projects in both small units such as flats over shops, as well as large projects such as period or commercial buildings, multi-occupancy buildings, heritage properties and buildings of significant historical value. The batts contribute to insulation and dampening sound between floors with acoustic upgrade protection.

    Use fire barriers to compartmentalise spaces, rooms and areas. This helps slow down the spread of smoke and fire, giving more time for evacuation of staff and customers to help save lives and prevent injury, as well as helping keep damage to a minimum whilst emergency services arrive to tackle the fire.

    Typical Installation

    Observe Intudeck safety data sheet before commencing work.

    1. Lift sufficient floorboards to allow Intudeck to be installed.
    2. Clear any remaining pugging from the ceiling/floor void and clear dust from the sides of the joists to improve the adhesion of the bonding Intumastic.
    3. Apply a 10mm bead of Intumastic to the side of each joist 35mm from the bottom.
    4. If adhesion is difficult, spray the joist with water from a small garden spray.
    5. Measure the gap between joists and cut an Intudeck batt along the 1200mm side to fit tightly and under compression.
    6. Place loosely in position at 45° between joists. Using a timber board to spread the load, ease into final position using gentle foot pressure.
    7. When finally positioned, apply a 5mm bead of Intumastic all around the seal and on the butt joints.
    8. Inspect and check completed work and re-fix floorboards

    Fire Testing

    Intudeck has been rigorously tested to BS 476 Pts 20 and 22: 1987 at a UKAS accredited laboratory for up to 90 minutes fire integrity and insulation.

    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.

    Product Details

    Data sheet

    Single, Two or Three Pack
    Suitable For Use On
    Suitable For Use On
    Timber Floors
    Application Method
    Product Type
    Fire Barrier
    Fire Rating
    90 Minutes

    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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    Nullifire FB770 Intudeck is only available with the shipping and delivery timescales listed below - please do not contact our Customer Support Team with enquiries about alternative or earlier shipping and delivery times.

    Saturdays and Sundays, as well as Bank Holidays, are not classed as working days.

    Orders placed after the cut-off for this product will not be processed for earliest dispatch until 9am the next working day.

    All delivery costs below are excluding VAT