Envirograf Intumescent Gaskets & Acoustic Covers for BESA, conduits, sockets & switches, with options for acoustic covers & deep and shallow-lined boxes. Refer to References & Sizes below For all plastic & metal boxes Ceiling rose & cooker box Single, double & triple sizes Designed to comply with British...
Envirograf Under Floor Fire Barrier
Use this Under Floor Fire Barrier when ceilings cannot be fireproofed or accessed from below, such as decorated or lath and plaster ceilings.
- Refer to sizes below
- Please state if the joist gap differs from 400mm.
- Provides up to an hour fire protection
- Optional soundproofing sponge
- Made from graphite impregnated cloth with foil
|UF60/300||300mm x 1800mm||60 minutes|
|UF60/350||350mm x 1800mm||60 minutes|
|UF60/400||400mm x 1800mm||60 minutes|
|UF60/450||450mm x 1800mm||60 minutes|
|UF60/500||500mm x 1800mm||60 minutes|
|UF60/600||600mm x 1800mm||60 minutes|
|UF104/300||300mm x 1800mm||104 minutes|
|UF104/350||350mm x 1800mm||104 minutes|
|UF104/400||400mm x 1800mm||104 minutes|
|UF104/450||450mm x 1800mm||104 minutes|
|UF104/500||500mm x 1800mm||104 minutes|
|UF104/600||600mm x 1800mm||104 minutes|
For sound insulation – 40mm thick sound proofing sponge can be ordered:
|300/S||300mm x 1800mm||60 minutes|
|350/S||350mm x 1800mm||60 minutes|
|400/S||400mm x 1800mm||60 minutes|
|450/S||450mm x 1800mm||60 minutes|
|500/S||500mm x 1800mm||60 minutes|
|600/S||600mm x 1800mm||60 minutes|
The underfloor fire barrier is supplied to fit a standard 400mm gap between joists, allowing a further 50mm on each side for fixing.
Please state if the joist gap differs from 400mm.
Skilled tradespeople are required when installing the underfloor fire barrier system.
Although the barrier is extremely durable, care must be taken not to tear the barrier during installation.
All of the supplied metal plates must be used when fixing the barrier in position.
Envirograf's Under Floor Fire Barrier is ideal for ceilings that are hard to access, delicately decorated or made from lath and plaster, fireproofing by installing an underfloor fire barrier from above.
Made from graphite-impregnated cloth with 200g foiled cloth, this fire barrier offers fire protection for up to an hour, slowing down the spread of fire through a building for extra evacuation time. Containing a fire allows more time for emergency services to arrive and extinguish the fire before more damage is caused to a building.
Should you be able to fireproof from below, then Envirograf Fire-Resistant Smooth Finish For Upgrading Plasterboard (Product 105) should suffice.
For additional sound protection, 40mm-thick soundproofing sponge can also be ordered.
1. Lift three floorboards by the wall and three more 2100mm into the room
2. The fire barrier is 1800mm long and its width should be the width between the joists plus 100mm. Each of the long sides should be bent up by 50mm with the grey cloth side up against the joists.
3. Slide the barrier under the floorboards and, where it reaches the wall, bend up the barrier by 50mm.
4. Small metal fixing plates with pre-drilled holes are supplied for fixing the barrier to the joists and the walls. Use one fixing plate at the wall end of the barrier and fasten the barrier to the wall using 30mm galvanised large-head clout nails. Then nail a fixing plate into the joists at intervals of 200mm along each upturned side of the barrier.
5. Re-fix the floorboards you previously lifted beside the wall.
6. Lift three more floorboards, 2100mm away from those already up.
7. Repeat as in step 2 but overlap each new piece onto the previous piece by 50mm and continue like this over the whole floor area.
8. If you have to cut the barrier, self-adhesive-backed Kraft tape is provided to re-seal the cut ends.
9. The barrier can be laid on top of cables. If you need to push a cable or pipe through the barrier then this can be done by making a hole with a screwdriver. Small holes for cables or pipes have no detrimental effect on the barrier as the intumescent material will seal off the holes in a fire. If necessary you can seal puncture holes with Envirograf® Product 58 AM Intumescent Mastic.
The underfloor fire barrier, fixed in a typical floor section, was tested in a full-size rig 4m x 3m with a loadbearing capacity of 1.5kN/m² in accordance with BS476 Part 22 (1987) achieving 104 minutes insulation, integrity and load-bearing during test RF95002.
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. 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.
Any Envirograf products to be used in or for Harrods department store should be authorised with our Technical Team prior to purchase.
It is your responsibility to read the Product Data Sheets (available below) before you place an order and prior to application of the product. The content of this website is our best recommendation and is not advice. Coverage rates quoted are approximate, you agree that coverage depends on the condition of the substrate, surface absorption, texture and application method. We ALWAYS recommend a trial area is coated to ensure the product meets your requirements before use.
Be the first to ask a question about this product!
Protecta FR Foam, part of the Protecta Firestopping range, maintains fire resistance in walls by filling linear gaps in concrete and masonry walls, with excellent adhesion to most materials used in construction and excellent durability during service once cured. Fire protection foam Single-component, available in 750ml hand-or-gun-grade...
Non Intumescent Glazing Tape for fire-rated glass in steel doors, partitions and windows, where intumescent properties aren't required. Ideal for high temperature insulation of various vehicle parts, such as silencers, catalytic exhausts, heat shields and gaskets. 15m rolls Easily installed with self-adhesive backing
Firetherm Intumastic seals around dry internal joints, pipes and services to insulate and prevent the spread of fire and smoke for up to 240 minutes. Tack free between 15 minutes and an hour Can be over-painted once fully cured Use in movement joints - allows up to 30% movement Optifire Identification Air pressure tested up to 2000 Pa...
Envirograf Intumescent Pads for steel, PVC and uPVC trunking. These pads expand during a fire, preventing PVC cables from spreading fire through a fire barrier. Up to 3 hours fire protection Self adhesive Requires no maintenance No restriction to cables Quick & easy to fit Takes up very little space Identification labels supplied...
The Envirograf Bat Access Door Fire Protection allows pre-existing and protected bat populations in loft spaces to continue to fly through doors unobstructed. A thermal link that breaks during fire, dropping down a fire curtain to help seal against fire 300mm wide and 160mm high More sizes can be made to order It must be stated, when...
VWBS Ventilated Cavity Barriers made from flexible fireproof sponge, for use in brick/block cavities. Its unique spring properties mean it can be fixed simply by pressing into place. Refer to sizes below Must only be used horizontally Barrier must be 10mm wider than the cavity Offers thermal insulation Up to 2 hours fire protection
Use Envirograf's Protective Covers for Works of Art give smoke and fire protection to works of art, such as pictures, busts, statues and ornaments. They have been used at Eltham Palace in South-East London to protect a late 18th century grand piano, a grandfather clock, a sculpture of Virginia Courtauld, and even a massive oak dining table...
Metal Support Battens are used with Envirograf Intumescent Slabs when dealing with floor openings larger than 800mm. The bracket offers support to firebreaks installed in floors. Use with Envirograf products 4, 5 & 6. Priced per metre - use quantities for each metre required
Hi-Tak Spray Adhesive, a fast acting high-strength adhesive for most substrates and materials, including car and vehicle repairs and refurbishments. 500ml spray can Easy to apply Use with Envirograf Fire Barrier Curtains (Products 56 and 57)
Maintain fire barrier integrity when cables pass through walls or ceilings, with a Fire & Acoustic Cable Management unit. Refer to ordering preferences below Other sizes and finishes can be made to order For cables up to 25mm diameter max Provides sound and fire protection
Nullifire FS721 Trowel Grade Acrylic Sealant is a single part waterborne fire resistant acrylic sealant. FS721 sealant can provide up to 4 hours fire resistance when used in conjunction with Nullifire FS747 Coated Board System.
Envirograf Intumescent Cable Tray Pillows break their stitching to fill the space around and between cables, sealing openings during a fire for up to 4 hours of fire protection, restricting spreading of fire and smoke through walls, floors and ceilings. Simple to install Cord and retention tag included For metal and plastic cable trays...
The N/F Powerful Flexible Filler Kit for Pipes & Cables fills and finishes around metal pipes and cables with intumescent material for up to 2 hours fire protection. 3 tube kit Water-based For plasterboard and solid substrates
Ventilation with fire protection, HMG Ventilation Grilles fit into metal-cased windows for ceiling ventilation, or directly into glazing. Ideal for bathrooms and kitchens, the grilles have intumescent material that expands in fire to seal the grille completely shut. Refer to sizes below Easy to fit White or brown, with more colours &...