Multi-Pro

All 12mm boards across the Resistant range are suitable for use behind a wood burning stove however 12mm Multi-Pro XS or 12mm Multi-rend would be suitable for the most demanding applications as these are the highest performing boards. Please see the ‘Solid Fuel Stove Brochure’ available for download.

Yes. Our boards have far superior properties in comparison with plasterboard such as fire resistance, impact strength, breathability performance and durability to damp.

The requirement for a primer would be detailed by the tile adhesive manufacturer. Resistant boards have been extensively tested with market leading BAL tile adhesives and acrylic primer. During testing, the bond between tile adhesive and Resistant board was significantly strengthened when primer was applied. Tiles should be fixed to the rough side of the boards.

Before applying paint or plaster the board requires priming on face and edges with an acrylic-based primer. Please refer to the ‘Primer Information Page’ available for download which details various primers which have been tested for use with the board.

Resistant Building Products always recommend mechanically fixing the boards. In-house testing has been carried out using CT1 Grip & Grab adhesive, by fixing our boards back to timber and block, a suitable adhesion was achieved where the adhesive would only be suitable to offer a temporary fix. The adhesive could be used together with screws and nails for an extra strength fix. (Please see our ‘Accessories Information Page’ for more detail). Detailed mechanical fixing guides for all Resistant products are available for download.

For internal use - any standard self-tapping countersunk screws are feasible. These should be readily available from all local merchants. On a full 8’ x 4’ sheet when fixed at 300mm centres vertically and at 600mm centres you will need 27 fixings per sheet. For Multi-pro as a tile backer – stainless steel or minimum 12 micron galvanised fixings should be chosen at all times.

Very easily! By score and snap with a standard craft knife, Stanley blade and can be hand or machine sawn. We would recommend a saw with Tungsten Tipped Carbide blade. A video of the score & snap method can be found here.

Resistant’s core range of boards are covered by a BBA certificate. This details that Multi-pro is a durable material and should have a life equal to that of the structure they are installed.

No. Resistant boards will not deteriorate when in contact with moisture over prolonged periods but they are not designed to stop water ingress. The boards are breathable and allow the passage of moisture. Resistant boards will absorb moisture in damp conditions and release same when the ambient conditions allow. This process can be repeated continuously.

The boards do not share the same strength properties. Although material composition is very similar, the actual strength is determined by thickness, density and number of layers of alkaline resistant, glass fibre reinforcing mesh within each board. Multi-pro are very strong but only require 2 layers of reinforcing mesh.

The thinner the board the greater the flexibility. 3mm Multi-pro can be bent to 45 degrees and our 9 & 12mm boards can be curved to an 8m radius when fixed at 300mm centres.

The boards will support light fittings only such as; toilet roll holders, shower curtain rails, small vanity mirrors, shelves, pictures etc. Appropriate fixings must be used along with rawl plugs. Other large fittings such as grab rails and cabinets must always be fitted into supporting studwork.

A series of our boards have been tested for pull-out strengths with Ejot, Sympafix and Rawlplug fasteners to name a few. These reports are available upon request.