Removing MgO plates is one thing, but what about the wood underneath?

The problem with MgO plates is that they absorb water due to their salt content. In the Danish climate, this means that for at least a few months every year, they directly "sweat out" saturated salt water. This strong salt water destroys nails, screws and fittings, but the salt water also penetrates the wooden structure behind the MgO sheets.

Tests show that wood that has been in contact with MgO boards has absorbed such large amounts of salt that the wood itself has also become moisture absorbent.

This means that when you have removed and replaced the MgO panels with other cladding, you leave wood that will absorb moisture from the air and be humidified to well above the "pain threshold" of 15 % for long periods of the year.

This means that the wood is very likely to be attacked by mould and will probably eventually be attacked by wood-degrading fungi.

If the wood is already affected by mould when you peel off the MgO boards, it's clear that the contract MUST include mould remediation. But if you don't finish with a preventive treatment against mould and wood-degrading fungi, you risk introducing a significant risk of subsequent problems in the construction.

Our recommendation is therefore - remove the MgO plates. Remove any mould growth with Protox Hysanmake sure to dry out the structure as well as possible and then treat with the approved wood preservative Protox Sponge. This will prevent both wood-degrading fungi and mould in the wood that has been in contact with the MgO plates.