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Magnesia screed (MA)

Magnesia screed is a special screed because it does not contain any artificial ingredients, only natural components:

  • Caustic magnesia (according to DIN 273, Part 1) as a binder
  • Magnesium chloride (according to DIN 273, Part 2) – together with the caustic magnesia, allows the screed to harden into a cement-like mass
  • inorganic mineral aggregates such as quartz sand or flour
  • organic matter such as small pieces of wood, sawdust, wood shavings, textile fibres, cork or paper flour

This means that magnesia screed, which was formerly known as stone wood screed, is a natural product where color deviations are normal.

Areas of application for magnesia screed

Magnesia screeds are used as screeds in industrial and commercial areas. There, the screed is highly resilient, but must not become damp. Typical areas of application here are high-bay warehouses, exhibition and sales areas.

Since magnesia screed is low in dust and also electrically conductive, it is very well suited for floors that must have antistatic properties. However, magnesia screed is also used in the renovation of old buildings, especially in ecological construction. Here the screed can be used on wooden beam ceilings - as it was a few centuries ago.

However, due to its extreme sensitivity to moisture, magnesia screed can under no circumstances be used in wet rooms. It cannot be used outdoors either.

Laying techniques of magnesia screed

Magnesia screed is used as bonded screed. It is applied with an adhesive bridge (this is mandatory in heavily used areas!) and distributed evenly. It is then compressed and drawn off according to its consistency. The nominal screed thickness of magnesia screed is at least 25 mm.

If the magnesia screed is to be used as part of an ecological construction method, it is impregnated with linseed oil before use.

What to look out for when laying magnesia screed

Magnesia screed must be processed immediately after mixing. The outside temperature should not be below 10 °C and the room should be as dry as possible.

Magnesia screed takes a while to harden. It can be walked on after 2 days at the earliest. Until then, it must be protected from draughts, driving rain and heat. After about 5 days it can be loaded a little more, but it will only be ready for covering after 2-3 weeks at the earliest.

Attention: Magnesia screed is extremely sensitive to moisture and reacts to metals. Corrosion may occur on contact with metal. This applies not only to hardening, but also to the time after the drying phase.

The advantages of magnesia screed

Magnesia screed can be laid on almost any substrate: concrete, wood, bitumen or calcium sulphate substrates are possible. Thanks to its low shrinkage behavior, magnesia screed can be laid there almost seamlessly.

With compressive strength classes up to C80, it also has a high level of wear resistance. Practical: It can be dyed if desired - and without loss of strength. Magnesia screed is also chemically very resistant. Mineral oils, fuels and many other chemical substances cannot harm it. It is also characterized by good sound and very good thermal insulation.

Magnesia screed and more: We are there for you

Do you attach great importance to sustainability and ecological construction? Then magnesia screed could be just the right screed for you. If you would like to find out more about the screed with the wood-like properties or would like advice, we are happy to be at your disposal with our expertise and our experience from over 25 years of practice.

We offer you a high level of quality, compliance with which we ensure with comprehensive quality management. Reliability and professionalism are the characteristics of our staff, who will be happy to assist you with your magnesia screed (or any other type of screed) project. Contact us now and tell us about your concerns, we look forward to hearing from you!

[ FAQs ]

Questions and answers about magnesia screed

What is magnesia screed made of?

Magnesia screed consists of the components of caustic magnesia and magnesium chloride as well as organic substances and inorganic mineral substances or a mixture thereof.

What is stone wood screed?

Stone wood screed is the old name for magnesia screed. It dates back to the 19th century, when screed was mixed with wood flour or pieces of wood when used on wooden beam ceilings. After the wooden beam ceilings became rarer in the post-war period, the term stone wood screed also disappeared.

Is magnesia screed suitable for damp rooms?
No, the screed is extremely sensitive to moisture. The magnesium chloride it contains reacts chemically with water. If magnesia screed is used as a fair-faced screed, a barrier layer must be used. Otherwise, care should be taken even when cleaning the floor with a damp cloth.