70mm Karma TNF70 Fire Retardant Slab

70mm Karma TNF70 is a very high-density stone-fibre slab used in conjunction with Karma Masspanel in a floor build-up, and to upgrade the fire resistance of timber floors to 90 minutes fire integrity and insulation. This panel is used where a ceiling cannot be disturbed or where access is not possible from the soffit face. They can be easily cut to suit on site and fitted between joists, after removing a number of floorboards, secured under compression and bonded with Karma EX240 intumescent and acoustic mastic. A dry system that will not damage sensitive lath and plaster ceilings or fine plaster mouldings.

• Covers most joist centres,
• Installed without the need for steel bracketry,
• Lightweight and fast to install,
• Excellent acoustic performance to height ratio,
• Tested to BS476-22 up to 90 minutes,
• Installed from above existing ceiling can be retained,
• Boards can be installed directly to joists,
• Dry system which is quick to install,
• Can be laid with a variety of floor finishes,
• Used with Karma Masspanel
  
  

Used to upgrade the fire resistance of timber floors to 90 minutes fire integrity and insulation. Often used where a lath and plaster ceiling must not be disturbed or where access is not possible from the soffit face because of occupancy of a dwelling or congestion caused by mechanical services. In particular multiple occupancy, houses, flats, offices, shops, hotels and nursing homes.

• Clear any remaining pugging from the celling/floor void and clear dust from the sides of the joists to improve the adhesion of the bonding EX240.
• Apply a 10mm bead of EX240 to the side of each joist 35mm from the bottom. If adhesion is difficult, spray the joists with water from a small garden spray.
• Measure the gap between the joists and cut TNF70 along the 1200mm sides to fit tightly between the joists, white coated side up.
• Place loosely in position at 45 degrees between joists.
• Using a timber board to spread the load, ease into final position using gentle foot pressure.
• Once positioned, apply a 5mm bead of EX240 all around the seal and on the butt joints.