Can You Use Magnesium Chloride on Composite Decking?

M. John
Can You Use Magnesium Chloride on Composite Decking?

Like rock salt, magnesium chloride can also melt ice. Removing snow with a shovel can be stressful for some during winter. Using ice melt instead can dissolve the snow quickly. For those with ultra decking in their homes, snow can make the deck slippery. You might have considered laying magnesium chloride on your composite decking. Is magnesium chloride safe? Can you use magnesium chloride for composite decking?

How Magnesium Chloride Works on Composite Decking

Magnesium chloride is a naturally occurring compound that is flaky white. Some magnesium chloride can also look clear or transparent. The magnesium chloride is processed and used as the ice melts on composite decking.

Ice melt is a substance used to dissolve snow on walkways or driveways. Ice melts work by lowering the freezing point of water and melting ice. Magnesium chloride is an effective ice melt that dissolves ice easily. It works by absorbing moisture. If you place magnesium chloride on ice, it will start melting the ice very fast.

In addition, magnesium chloride also prevents ice from forming on wood-plastic composites. If you place magnesium chloride on your decking before it starts snowing, it will prevent ice from forming. Homeowners who install decking in their gardens can use ice melt to remove ice from the decking.

Is Magnesium Chloride Good For Composite Decking?

Like other ice melt like calcium chloride and rock salt, magnesium chloride is good for composite decking. Magnesium chloride is not harsh; it is also less corrosive. It is less harmful to composite deckings if you use it moderately. Magnesium chloride is also less harmful to plants if you don’t overuse it.

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In addition, magnesium chloride is environmentally friendly. It is good for use in the environment. Magnesium chloride is also less irritating to the skin. If your skin accidentally comes in contact with magnesium chloride, it might not irritate it.

Apart from that, magnesium chloride can melt ice quickly. It also differs from other ice melt in that it leaves little to no residue on your decking.

Precautions to Take When Using Magnesium Chloride in Composite Decking

When using ice melt like magnesium chloride on your decking, you should take precautions. If you follow these precautions, it will prevent your composite decking from early damage. Below are a few guidelines you need to follow if you want to apply ice melt to your composite decking.

Avoid Magnesium Chloride That Contains Colourants

When choosing magnesium chloride as an ice melt, do not choose a type containing colourants. This is because magnesium chloride that contains dye or colourants can stain your decking. The colourants in the ice melt can make your decking look ugly. It can slightly discolour your composite decking, making it look less attractive.

You should avoid using any ice melt that may contain dye. Always ask well in stores before purchasing the ice melt. You should always go for a magnesium chloride ice melt that does not contain any trace of tint or dye.

Avoid Magnesium Chloride With Traction Grits

If you want to apply magnesium chloride ice melt to your composite decking, do not use an ice melt that contains traction grits. Some ice melt contains traction grits like sand or wood dust. You should avoid using that kind of ice melt.

An ice melt with grits can disfigure your composite decking. It can also scratch the surface of your composite decking, thereby making it less attractive. In addition, decking owners should avoid using sand on wood-plastic composites either. Sand can be abrasive and scratch the surface of the composite decking.

Use Magnesium Chloride Moderately

When using magnesium chloride for composite decking, use a minimal amount. Do not apply too much to the composite decking. Magnesium chloride is effective even if you apply it in a small amount.


You can use magnesium chloride for composite decking. However, when using magnesium chloride, use it moderately. In addition, do not use magnesium chloride that contains traction grits or dye.

Also, check out how to fix swollen composite decking boards.


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