British Gypsum Glasroc F Multiboard

The British Gypsum Glasroc F Multiboard is a highly robust non-combustible glass-reinforced gypsum plasterboard. This product achieves a class 1 and class 0 fire rating that can be applied to all forms of partitions and ceilings. The Glasroc F’s high impact resistance and moisture tolerance properties make it suitable for semi-exposed areas of building projects saving cost and time.  

Product Details:

  • Manufactured in thicknesses of 6-12.5mm
  • Manufactured in 1200mm widths 
  • Available in squared edge 
  • White Faced 
  • Conforms to EN 15283-1

*Always Refer Back To The Manufacturers Specification Document 

Download Specification

Suitable for constructing all forms of partition and ceilings, including curved applications, giving high levels of fire and impact protection. Also offers increased levels of moisture performance.

Can be used in semi-exposed situations such as eaves, canopies and carport under-linings.

Product description

Glasroc F multiboard consists of gypsum incorporating a tissue of glass fibre immediately below the surface of the board. The core is reinforced with glass fibre rovings.

Available in square and tapered edge (bespoke only). This plasterboard is one of the products within our plasterboard range that is certified to BES 6001 achieving a rating of ‘Excellent’.

Board performance

Fire protection

The surfaces of Glasroc F multiboard are designated Class 0 and non-combustible (for the purposes of national Building Regulations). Please refer to the table below.

Fire resistance

Please refer to the White Book product or systems section for information on the fire resistance of building elements lined with Glasroc F multiboard at white-book.

Application and installation

It is important to observe appropriate health and safety legislation when working on site i.e. personal protective clothing and equipment, etc.

The following notes are intended as general guidance only. In practice, consideration must be given to design criteria requiring specific project solutions. Glasroc F multiboard should be stored on a firm, flat and level surface.

If the boards are temporarily stored outside they should be kept clear of the ground and securely covered with an anchored polythene sheet or tarpaulin to protect from dampness and inclement weather.


Manual off-loading of this product should be carried out with care to avoid unnecessary strain.

For further information please refer to the Manual Handling section of the Site Book or Manual Handling Guide, available to download from the British Gypsum website at

Cutting This product may be cut using a plasterboard saw or by scoring with a sharp knife and snapping the board over a straight edge. Holes for switch or socket boxes should be cut out before the boards are fixed using a utility saw or sharp knife.

Cutting (continued) When cutting boards, power and hand tools should be used with care and in accordance with the manufacturers’ recommendations. Power tools should only be used by people who have been instructed and trained to use them safely. Appropriate personal protective equipment should be used. Consider monitoring of exposure levels during this activity.

Fixing For information on fixing this product please refer to the appropriate White Book and Site Book sections.


The smooth face of Glasroc F multiboard can be plastered with either Thistle BoardFinish, Thistle MultiFinish or Thistle DuraFinish. There should be a minimum of delay between completion of the lining and the commencement of plastering. 

Gyproc jointing materials produce durable joint reinforcement and a smooth, continuous, crack-resistant surface ready for priming and final decoration.

Use Gyproc Joint Cement for jointing Glasroc F multiboard. For further information please refer to White Book section 13 – Jointing.

Gyproc Joint Cement is trowel applied to the joint and Gyproc Joint Tape bedded in. Alternatively Thistle ProTape FT50 is applied over the joint and a coat of Gyproc Joint Cement is trowel applied.

The joint treatment is allowed to dry and lightly sanded to remove any high spots. For internal angles the use of Gyproc Joint Tape is preferable to Thistle ProTape FT50. Its crease makes it easier to achieve a neat, straight joint with higher cracking resistance.

For external angles, Gyproc Corner Tape is used, bedded in Gyproc Joint Cement.

A second coat of Gyproc Joint Cement is trowel applied and feathered out to about 200mm width on each side on the joint.

The joint treatment is allowed to dry and lightly sanded. Gyproc Metal Drywall Angle Bead can be used but Gyproc Joint Filler must be used on the first two coats.

A third coat of Gyproc Joint Cement may be necessary, applied as the second coat and slightly wider e.g. where boards are fixed with any steps, gaps or minor damage.

When the final application has dried and been sanded smooth, the surface is ready for decoration. Jointing and finishing of the Glasroc F multiboard is not a requirement to meeting the specified fire protection period.


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