Magnox

FAQ's

Magnox boards are magnesium oxide based boards that can be used within the construction industry for interior and exterior uses. Unlike many such products the boards are not produced using Magnesium Chloride thereby avoiding any potential problems from corrosive slats (chlorides).

Produced in a standard 2440mm x 1220mm (8x4) format the boards are available in a range of thicknesses from 3mm to 18mm and come as a flat off-white sheets with one smooth side as an outer face that works well with all types of finishes.
With zero flame spread and virtually smokeless Magnox boards provide an excellent first line of defence against the spread of fire. To perform effectively, as with all building materials, the boards should be integrated into a system that enables them to perform effectively in preventing the spread of fire as per local building and civil defence regulations.
Magnox boards are manufactured using Magnesium Oxide (MgO) as the key ingredient in the slurry mix that is used to produce the boards. MgO is a sustainable product available in vast resources from all over the world; furthermore it can be extracted from seawater.

The boards are produced using no-autoclaving, so the production of the boards has lower energy demands than similar based products lowering the carbon footprint. Boards are cured at room temperature over a two week period and during this process the boards will draw back in much of the carbon released in the initial chemical reaction of the slurry and during the initial board production, making Magnox boards a virtually carbon neutral product.
If in contact with water the boards will absorb some of the water and release the water at a rate depending on the climatic conditions that the board is in. However, the overall characteristics and properties of the board remain stable in water with no swelling or disintegration of the board.
Magnox boards are best cut with a power circular saw with a tungsten carbide blade. Alternatively, an angle grinder or power jigsaw can be used.

Conventional wood working equipment, such as a hand saw with hardened teeth, may also be used.

Boards up to 12mm thickness can also be cut with a contractor grade utility knife/retractable blade, where other more suitable methods cutting methods are not available, though board edges may not have a smooth finish.
Magnox boards can be cut on site fairly easily. However, if a large amount of boards are to be cut, it is recommended that cutting is carried out off site under controlled conditions as much as possible, to ensure good quality of finished edges etc.

Off-Site Cutting
Cutting with diamond tipped blade is recommended, carried out using high speed electric motor (2500-3000 rpm) depending upon the diameter of the blade.
The saw support can be equipped with several saws for multi cutting in a single pass of the blades over the boards. The boards should be cleaned after cutting to avoid leaving any dust on the surface.
Diamond tipped blades can be used to cut more than one board at a time depending on the diameter of the saw.

On–Site Cutting
While working at site, hand tools and low speed electric tools are generally recommended. When high speed electric tools are used, dust extraction is essential.
While working with power hand saws the following important points should be observed:
1) Ensure that the boards to be cut are continuously and well supported on either side of the cut.
2) A straight edge should be clamped in position to guide the cutting operation.
3) Care must be taken to ensure the tool remains against the straight edge during the cutting operation.
4) The cutting rate should be such that the blade is not laboring or over-heating.
The following recommendations must be always taken into account when handling the boards.
1) Wherever possible, always lift boards from the stack below rather than slide board on board. This will prevent damage or scratches occurring to the lower boards.
2) Always carry the boards from the edges with both hands and not with one hand.
3) Never stack the boards on the edges.
Magnox boards are supplied on timber pallets, with protective plastic sheet wrapped around the stack of boards. Prior to use and whilst being stored keep the plastic sheet wrapping around the boards to maintain the boards in good condition.
Pallets are supplied with cardboard protection on the corners and edges. This protection should not be removed until the boards are ready for use.
In general, the following steps should be taken to ensure that the boards remain in good condition during storage.
1) Magnox boards should be stored in covered shade on dry level ground, away from the working area or mechanical plant.
2) Not more than 3 pallets should be stacked on top of each other.
3) The board must be protected from inclement weather and should not be left out in direct sunlight for any length of time.
When fixing Magnox boards, we recommend using 316 stainless material for all fasteners. Fasteners will vary as per the system being utilized and as per the project conditions; it is therefore recommended that a local fastener expert be consulted

In general;

1) Use a flat head screw with nibs under the head for countersinking into the board, and a self-drilling point for penetrating supporting frame/substrate.
2) Install fasteners no closer than 100mm from corners.
3) Perimeter fasteners should be placed 150mm apart.
4) Center fasteners should be placed 300mm apart.
5) Install fasteners approximately 15mm from the board edge.

In some instances where it is preferable to use an adhesive to secure the boards in place rather than screw fixing the boards, then please note that Magnox boards have been successfully tested through climate control chambers by Sika using their SikaTack Panel 50 and Sikasil SG-18. These adhesive systems are suitable for interior and exterior applications and maybe preferred where boards being used have a finish already applied (such as laminated finish) prior to fixing into place. Your local Sika distributor will be able to advise further regarding these adhesive products and their method of application
Magnox Boards can be used for façades with a variety of different systems.

They can be used for cladding with a suitable render coat that protects the boards from the elements. For EIFS systems, the boards can be used as a suitable backing/sheathing board for the insultation board to adhere to with an appropriate adhesive.

It is highly recommended that the provider of the façade system be consulted to ensure the Magnox boards are used in the appropriate manner with the correct fixing materials and methods being used