We are always finding new ways to update our home exteriors.
And renovating our cedar wood fence with a fresh paint coat can help do that.
However, if during the process, you spot mold, moss, lichens, or algae on your privacy fence, what should you do?
How should you clean the mold and moss on your cedar wood fence before painting?
I will cover that all in this article…
In this article we will cover:
Cleaning Mold and Moss on Cedar Fence
Many homeowners believe that sunshine and the harsh UV rays will work to kill the mold and moss automatically.
Although it does work to shrivel them hard, cleaning the mold on your wood fence thoroughly is important before you can apply the paint.
And here are the exact refinishing steps by which you can do it:
Step 1. Wash
The very first step to cleaning the black molds and moss is by using a scrub brush and water.
If you think it’s a very time-consuming process you can take the help of a pressure washer.
Just make sure that you stand at least 36 inches away and keep the PSI of the washer low so that it does not damage your aged cedar wood fence.
While washing, use a bit of cleaning solution or detergent soap and spray on both sides of the fence.
This will help in removing the layers of dead wood cells along with all the mold and mosses.
Step 2. Use Vinegar
White vinegar is a common kitchen cleaner that has been used for centuries – to clean and prep a wide variety of surfaces.
Vinegar is also – perhaps the best solution when it comes to killing and cleaning the molds and mildew off wood fences.
To clean the molds and algae on a wooden fence with a homemade fence cleaner vinegar solution, here is what you need to do:
- Cover the nearby plants and areas with plastic
- Pour vinegar into a spray bottle without any dilution
- Spray it on the mold and let it be there for several hours
- Once it has completely penetrated the wooden fence surface, scrub with a bristle brush till all the mildew and mold has disappeared
While doing all the mold cleaning, it is important to stay safe by wearing a respirator or a mask so that you don’t end up inhaling any mold spores.
Also, vinegar itself may produce a pungent smell, which you should be careful about.
Step 3. Prime the Fence
When you have cleaned the surface and are ready to paint, make sure that you don’t paint directly on the surface.
Instead, first, apply a coat of mold sealing primer (that prevents future mold growth) with a bristle brush.
In most cases, you should only need a single coat of primer to do the job. That is because you are going to add at least one if not two coats of regular paint on top.
Simply put, the wood primer can be considered as a glue, or an adhesive designed to help paint stick properly on wood.
In essence, you are prepping the surface so that the paint will be much easier to apply and look its best.
Plus, they offer other attributes that contribute to creating a smoother, more enticing finish once you are through painting.
When buying the primer, check the ingredients and directions on the primer container to see which type of paint is best used in conjunction.
Make sure that it’s the type that can be applied to wood surfaces.
Step 4. Apply Mold-Resistant Paint
Once you have primed the fence, it’s time to apply two coats of mold-resistant paint or a UV blocking stain using a high-quality paintbrush or a roller.
After applying a coat of the paint, let it dry and look at the results after 3-4 hours.
If it seems too thin, then you may want to apply a second coat of paint sealer just to be sure.
And you are done!
Painting or staining a wood fence will not only help your fence look better, but will also keep the wood from rotting and last longer.
Adding an additional paint coat is generally not necessary, although you may want to touch up specific areas that need a little extra attention.
Keep in mind, that there is a substantial difference between outdoor and indoor surfaces, so choose the paint for your cedar wood fence wisely.
Investing some time in selecting the right paint for the job can be most helpful and will make the paint last a long time.
Step 5. Use Garden Fence Preservative
If you want to further protect your garden fence from different mold varieties, algae, and other biological threats like wood-boring insects, I recommend using a water-based or solvent-based wood preserver.
These are the wood sealers that are available in clear as well as colored options.
- Solvent-based wood preservers come with high V.O.C content and are generally more useful for outdoor structures like fence timbers
- Water-based fence preservatives are alternatives to solvent-based formulations and are preferred indoors due to their low V.O.C content and less odor
Some of the solvent-based wood preservatives also contain a small amount of wax and exterior wood oil, which can help seal the wood better and provide long-term weather protection.
While these wood preservers can help to keep your fence panels supple and nourished, they can cost high and will need to be applied by professionals for better long last finishing.
Tips and Warnings
When using products other than water to clean your moldy garden fence, you should always focus on protecting your young plants first.
Although vinegar is a good weed killer, it can also kill your flowering plants, veggies, and grasses near the fence.
So, it’s good to cover your landscaping before you use vinegar or other chemicals.
Also, you will need to choose a good sunny day for fence cleaning.
Since mold and moss love to thrive during wet or humid weather, your cedar fence will have a hard time getting cleaned and drying.
Can You Paint Over the Mold?
While many painters suggest painting over to hide the molds and green algae, in my opinion, you should NEVER do that because it’s not a long-term solution.
If you paint your wood fence without removing the molds and moss, the problem will return soon as it has not killed the exact roots of the fungus.
Even worse if you use water-based paints they can serve as a food source for molds and fungus which will keep on developing even more problems in the near future.
Also, it keeps on damaging your cedar fences, and the cost of fixing will increase gradually.
In the long run, you will be bringing down the value of your property – just in case you are planning to sell it in the future.
Is Cedar Wood Mold and Moss Resistant?
I know many of you might have this in mind!
And that’s the reason you have actually invested in expensive cedar wood.
Well, cedar wood looks incredibly beautiful due to its colorful wood grain appearance.
Also, it’s great at removing moisture from the air as it can act as a natural dehumidifier in humid climates.
Yes, you got it right!
Cedar is a highly porous wood that can absorb and trap moisture very easily.
While this can be helpful indoors in places with high humidity problems, it can create severe problems outdoors.
Simply because it will promote the spread of mold, mildew, moss, and algae that keep on thriving due to high moisture.
So, when you use the cedar for fencing, decking, siding, or for other outdoor purposes, you will need to keep your cedar objects clean and dry.
If not properly maintained, cedar can develop mold.
Although the molds and moss cannot degrade the cedarwood, they will choose to live there for long due to cellulose that provides them the ideal nutrients.
Cedar vs. Redwood: Which Wood is Better for Fencing My Property?
For those looking at purchasing wood for fencing, cedar and redwood are both good choices.
They have their attributes, but which one is better for your needs?
That may be a difficult question to answer at first since both types of wood are durable, withstand the invasion of pests, and are quite attractive.
IMO, between the cedar and redwood, the redwood is arguably the best for fences – if you do not consider its expense.
It has definite advantages over cedar as well as Douglas fir, but it does cost quite a bit more.
For fencing, the most important properties you should be seeking include the following…
- Appearance, Durability, and Strength
- Weather Resistance, Grain Structure, and Resistance to Shrinking
Once you know what cedar and redwood can do for your fencing needs, then it becomes easier to choose between the two.
But again, they are different types of wood which means that each has its own features and complexities as well.
It will be up to you to decide whether it is worth the extra money to purchase redwood for your fencing.
Compared to metal, wire, or vinyl fences, cedar fencing around homes is more popular because of the beauty and natural looks they offer.
However, wooden fences will need more care and maintenance to upkeep their attractive appearance.
Cleaning molds, mildew, and green algae on fences can be time-consuming.
But hopefully, with the above helpful guide, you can now keep your fences like new for years.
Based on my experiences, vinegar and water spray acts as the best moss killer for fences and if you have not tried it, you should definitely give it a try.
Hi, I am Mark Garner a professional carpenter, woodworker, and DIY painter. I live in the small city of Peoria, Arizona as a semi-retired woodworker. I have started this blog with a simple motive to help you with my wood experience in this sector. If you like to know more about what I love doing and how it all got started, you can check more about me here.