How Do You Stop Merbau Leaching?

Merbau wood is a common material for fences because of its stunning look and longevity. However, tannin leakage from Merbau timber can be a problem for homeowners as it can stain adjacent surfaces.

When moisture seeps into the wood cells through the cut ends of the slats, leaching takes place, releasing tannins and extractants from the wood. This causes a stain to seep onto adjacent surfaces, giving it a brownish, rusty appearance. 

Merbau decking has a high tannin content, which makes it particularly prone to bleeding. Merbau leaching can be a bothersome problem, but it can be managed adequately with the right tactics and precautions. Below, you can see how do you stop Merbau leaching:

What is Merbau Leaching?

Merbau decking installation gives any outdoor area enduring beauty and robustness. However, tannins, which are organic elements present in many types of wood, are part of the natural composition of merbau.

These tannins cause the wood’s deep colour and resilience to pests and deterioration. But these tannins can seep out of Merbau decking when exposed to moisture, like rain or humidity, and discolour adjacent surfaces like concrete, tiles, or clothes.


Treating Merbau decking with a tannin-blocking solution before sealing can be beneficial. For this reason, products with oxalic acid or tannin-blocking compounds are frequently utilised.

Drying period

Before constructing the merbau wood decking as a fence, let it dry for at least two to four weeks. Store the wood away from direct sunlight and dampness in a dry, well-ventilated room. Tannin leaching is reduced during this drying phase by stabilising the moisture level of the wood. For the timber decking, choose a shop that offers high-quality products.

Seal the timber

Once you buy the Merbau decking 140*19mm, you can achieve Lower tannin leaching in Merbau timber Melbourne by applying a premium sealer.

Seek out a sealer intended for outdoor use, safe for wood, and able to prevent tannins from penetrating the surface. Follow the manufacturer’s recommendations for accurate application and reapplication.

Regular maintenance

Merbau surfaces must be properly maintained for long-term leaching prevention, including routine cleaning and sealant reapplication.

Examine the wood regularly for indications of deterioration and take quick action to fix any problems. Choose a famous shop which offers high-quality wood products to buy the durable Merbau decking 90*19mm.

Prevent water retention

Water retention around the fence must be avoided with proper drainage and upkeep. Trash, leaves, and dirt should be removed from the area at the base of the wall as they might retain moisture and hasten the leaching of tannins.

Ensure the ground and vegetation slope away from the wall to divert water flow from the wood. If you want to buy Merbau decking 70*19mm, select the store that offers all measurements.

Wash driveways with water

Driveways or pavers should be routinely hosed to prevent tannin stains from developing. Eliminating any tannin residue or stains that may have been collected can reduce the probability of difficult-to-remove stains developing.

This preventive action is especially crucial after prolonged downpours or heavy rain, as these can accelerate the tannin’s leaching.

How can leaching be cleaned? 

Tannins are water-soluble. Therefore, when leaching is first observed, all that is needed to clean them is soapy water. However, if the tannins have not been removed promptly, an oxalic acid-based timber cleaning product may be necessary.

Use a stiff brush to scrub the afflicted area after dissolving 1 kilogram of oxalic acid in 6 liters of warm water to use an oxalic acid tannin remover. 

Since oxalic acid is hazardous, thoroughly rinse the area with water after treatment.

Wrapping it up

As a result, you learn about how to stop Merbau leaching. Taking proactive measures to combat leaching can prolong the life and visual attractiveness of your outdoor spaces for many years, whether by building a new Merbau deck or preserving old surfaces.