Upgrading Loaded Timber Floors

Intudeck-Size:1200x600x70mm     Coated On One Side Only
Intudeck-Size:1200x600x70mm     Coated On Both Sides   

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

Intudeck is quick and easy to install, whilst applying minimal load to the ceiling joists. The product can be cut to fit on-site and compressed and bonded between the floor joists. A 10mm bead of Intumastic sealant is applied along the side of the joists, 35mm up from the base to define the end location and allow for cable runs in lighting circuits. Once all sections of Intudeck have been pushed into position at high compression using a board to spread the force, a further 5mm bead of Intumastic is applied around the perimeter of each batt and along the butt joints to ensure a smoke and air seal is maintained.

Intudeck is often preferred where occupancy prevents a downstairs ceiling being removed, or when contractors do not want to take down ornate lath-and-plaster ceilings. Work begins by lifting floorboards to gain access and thoroughly cleaning the void space, including removing dust from the sides of the joists to achieve a good bond.

Intudeck has been tested to tested to BS/EN 1365-2 in a loaded robust floor detail, using a joist size of 7" x 2" (196 x 45mm). 

Intudeck has also been tested to BS 476 Parts 20 / 22  in a non-loaded robust floor detail, using a joist size of 6" x 2" (160 x 48mm).

Installed in accordance with the manufacturers guidance, Intudeck will also achieve a 40dB sound reduction between floors and a thermal resistance of 0.038 W/Mk. 

To complete the system, we have a full range of Nullifire intumescent fire stopping products which can be used around  service penetrations. Please contact our technical team for further assistance, on 02476 422200

Data Sheet Links

FB770 Technical Data Sheet
Nullifire Fire Stopping Brochure
FB770 Safety Data Sheet
FB770 UL-EU Certificate


All order are usually despatched within 24 hours of receiving cleared payment (Mon-Fri)


Fire Stopping should be carried out by a competent person with the necessary expertise and experience. We would always recommend Third Party Approved Applicators. For assistance, please contact our techincal team on 02476 422200

The above information is based on current test data, health and safety information and application instructions supplied by our suppliers and manufacturers of the products. It is supplied for guidance and to the best of our knowledge is true and accurate. Customers should satisfy themselves to the suitability of the products in its intended use and no guarantee is given or implied as the conditions of actual use are beyond our control. If in doubt the customer should consult the designer of the project or the local building control. 

Fire Stopping Shop, disclaim any liability for loss, damage or other expense which may arise from the use of this information, data or products refereed to and reserve the right to amend or change any details without notice. This statement does not affect your statuary rights.