5 Tricks for Treated Lumber

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  1. The Proper Way of Cutting Treated Lumber
  2. How to Seal Treated Lumber
  3. How to Remove Mold from Treated Lumber
  4. Add Polyurethane to the Wood To Make It More Scratch Resistant
  5. How to Properly Paint Treated Lumber


The Proper Way of Cutting Treated Lumber

In cutting treated lumber, a sharp saw should do just fine.  When cutting wood, the usual approach is to put it on the table saw and then pull the saw towards the wood. Alternatively, the wood can be pulled towards you. But you can’t do these two approaches when cutting treated lumber because it could get splintered or chipped off.

But the saw makes enough momentum that you can harness it to cut the treated lumber easily. The best way to cut the wood is to push the treated lumber towards the blade, instead of pulling it towards you.

When cutting sections from treated wood, you may notice that each cut can potentially splinter or chip the wood. Of course, you don’t want that to happen because you woud not be able to repair the piece of wood.

To minimize the chance of chipping and cracking,  draw clear cut lines on the wood and place a two-inch wide tape over the lines. The tape must be centered evenly over the line. Then turn the wood over and slice it from the other side through the tape.


The Proper Way of Sealing Treated Lumber

In sealing treated lumber, you must clean it first using a pressure washer set to at least 1,200 PSI. This should enable the board lumber to be completely dried before you add the sealer.

Dry out the treated wood by placing it under direct sunlight for a couple of hours in the morning.  You can also put it in a dry room with a humidifier. Or you can use a hairdryer.

When sealing the lumber, make sure that the edges, back, front, and ends are properly sealed. This is very much important when you will use the treated lumber for fences and decks.

How to Remove Mold from Treated Lumber

Don’t believe in ads or home improvement store sales persons who claim that commercially available chemicals can remove mold from treated lumber.

Instead of using harsh chemicals, simply use soap and hot water. You can also try oil-free dish detergent. If the mold has been on the treated lumber for an extended period then you can mix white distilled vinegar and water.

Mold can be easily scrubbed off the treated wood, but don’t scrub the surface too hard.  You must also avoid using a wire brush as it can ruin the surface aside from shoving the mold even further into the grain.  A nylon brush that has soft bristles should be good enough to get the job done as long as you scrub the surface lightly.

When scrubbing the surface of the lumber, always do so in a circular motion. This should pull up the mold instead of pushing it back to the grain.  After scrubbing off the mold, don’t wipe off the sugar.  Use a power washer instead to remove it. You may also dump hot water over the treated wood.

Apply Polyurethane to the Treated Lumber

Adding polyurethane to a treated lumber should protect the wood and make it easier to clean. It can also make the lumber scratch resistant.  After it dries, polyurethane creates a coating similar to plastic that provides a barrier between the wood and the elements.

Two coats of polyurethane to the wood should be enough to make it scratch resistant and easier to clean. Dry out the treated lumber first before applying the chemical. You may also sand it before applying polyurethane.

How to Properly Paint Treated Lumber

In painting treated lumber, you must use a pain that is particularly designed for this kind of wood. The said paint is more expensive that your ordinary paint.

You can use either oil-based or latex-based paint for treated lumber. But for exterior use, you should go with a latex based paint since it is more durable and works better with treated wood. It can also expand and contract without cracking.

When applying paint, don’t apply it all in one thick coat. Instead, you should apply a few thin coats so that the treated wood will look great.

It’s your choice to apply the paint using a brush or with a spray. A paint brush is however more effective for reaching into the nooks and crannies of the wood. If you have large sheets of treated lumber, it may be more practical to use a spray instead. Allow the paint to completely dry in between coats.


To learn more how to care for treated lumber, please visit our page http://wilwaylumber.com/lumber/.

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Wilway Lumber is located at 28728 Fraser Hwy, Abbotsford, BC V4X 1K8

Wilway Lumber can be phoned at (604) 856-5144.