
Cedar siding is a popular choice for homeowners due to its natural beauty and aesthetic appeal. However, over time, it can become susceptible to dirt, grime, and environmental factors, resulting in a lackluster appearance. The accumulation of mold, mildew, and algae can cause deterioration and discolouration, necessitating occasional cleaning and maintenance. Power washing, also known as pressure washing, is often considered an effective solution for restoring cedar siding to its former glory. However, the question arises: should you power wash cedar siding before painting it?
| Characteristics | Values |
|---|---|
| Should you power wash cedar siding before painting it? | Yes, but it is recommended to do it 2-4 days before painting to avoid water getting trapped in the siding. |
| How to power wash cedar siding? | Power washing can be done on cedar siding if the setting is turned to low pressure. Soft washing is recommended as it is gentler on the wood and uses lower pressure settings, typically below 1800 PSI. |
| What to do before power washing cedar siding? | Identify the specific type of cedar siding, its age and current condition. Treat the mold and mildew on the cedar siding before power washing. |
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What You'll Learn

The benefits of pressure washing cedar siding
Pressure washing cedar siding can be a highly effective way to clean and restore the material when done correctly and with the right precautions.
Firstly, pressure washing cedar siding can help to prevent mould and mildew damage. Mould and mildew are often the cause of discolouration in cedar siding, giving it a dark and dingy appearance. By pressure washing, you can remove these undesirable substances and give the siding a fresh look.
Secondly, pressure washing can increase the property's value and curb appeal. Cedar is a popular material for siding due to its natural beauty and durability. Over time, however, cedar siding can accumulate dirt, animal droppings, loose paint, and other debris, causing it to look lacklustre. Pressure washing can effectively remove these contaminants, making the siding look clean and fresh, thus enhancing the overall appearance of the home and potentially increasing its value.
Additionally, pressure washing cedar siding can help stop bug infestations. Insects may be drawn to the wood, and power washing can eliminate both live and dead bugs. It also helps to clear any debris that could lead to the development of diseases, further protecting the siding and maintaining its integrity.
Pressure washing is a convenient method for cleaning cedar siding, as it can be done in your backyard with the right supplies. It is important to use the proper safety gear and ensure the power washer is set to low pressure to avoid damaging the cedar siding.
Overall, pressure washing cedar siding offers several benefits, including improved appearance, mould and mildew prevention, bug infestation control, and enhanced property value. By taking the necessary precautions and using the correct techniques, you can effectively clean and maintain the beauty and durability of cedar siding.
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$292.18

The risks of pressure washing cedar siding
Cedar siding is a beautiful addition to any home, but it requires careful maintenance. Pressure washing, or power washing, is an effective way to clean cedar siding, but it can also damage the material if not done correctly. Here are some of the risks associated with pressure washing cedar siding:
Damage to the Siding Material
Using a pressure washer with a high-pressure setting or holding the wand too close to the siding can gouge, fuzz, or splinter the wood. Cedar is a relatively soft wood, and the force of the water can be too aggressive, causing the wood to break down. This can result in unsightly damage and costly repairs.
Water Infiltration
If the pressure washer is not used correctly, water can get trapped in the grooves of the siding or even penetrate through the siding and into the walls. This can lead to moisture problems, such as streaking and staining, as well as potential issues with insulation and the growth of mould and mildew.
Inadequate Preparation
Before pressure washing cedar siding, it is crucial to address any mould or mildew issues. These growths are often the root cause of discolouration and deterioration of cedar siding. If not treated properly, the mould and mildew will continue to thrive, and your efforts will be in vain as the problem will persist or worsen.
Paint Stripping
The high pressure of the water can strip paint from the cedar siding, especially if the wrong tip is used on the pressure washer wand. This can result in an uneven finish and the need for additional paint touch-ups.
Environmental Concerns
The use of a pressure washer can also have environmental implications. The high-pressure water spray can cause water to infiltrate the surrounding areas, potentially affecting neighbouring properties or plants. Additionally, the detergents and chemicals used in pressure washing may be harmful to the environment if not properly contained and disposed of.
In conclusion, while pressure washing can be an effective way to clean cedar siding, it is important to be aware of the potential risks involved. Proper preparation, technique, and equipment are crucial to ensuring a successful outcome.
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How to pressure wash cedar siding without causing damage
Pressure washing cedar siding can restore it to its former glory without causing damage. However, cedar is a softwood, and high-pressure water can easily damage it. Here is a step-by-step guide on how to pressure wash cedar siding without causing harm:
Step 1: Identify the root cause of the dirt
Before you begin, it is essential to understand why your cedar siding is dirty. One of the biggest reasons for cedar siding to darken and look dingy is mould and mildew. Mould typically grows on the side of the building with the least amount of sunlight, so you will notice the worst spots in those areas.
Step 2: Treat the mould and mildew
Before pressure washing, treat the mould and mildew on your cedar siding. If you don't, your efforts will be futile as you will essentially be feeding the colonies with water. You can use products such as OxiClean, which uses oxygen and bleach derivatives to break down the barrier shells of mould, mildew and algae.
Step 3: Prepare the area
Cover nearby plants, electrical outlets and windows so that spray or blowback does not reach them. Tightly close all doors and windows. This step will safeguard your landscape and home and prevent unintended damage.
Step 4: Choose the right equipment
Select a pressure washer with adjustable settings and a wide-angle nozzle. A pressure setting of 1200-1500 PSI is sufficient for most work. If you want to avoid buying one, you can rent them from many hardware stores.
Step 5: Choose the right detergent
Use a cedar-safe cleaner or a mixture of water and mild detergent. Avoid harsh chemicals or bleach-based products, which can strip the wood. The right cleaning solution preserves the natural characteristics of the cedar.
Step 6: Pre-wet the siding
Pre-wetting with plain water helps loosen grime and prevents the siding from absorbing too much cleaning solution.
Step 7: Pressure wash
Keep the wand two feet away from the siding and move gradually closer if you need more power. Move the wand in even, overlapping strokes to avoid missing spots or leaving streaks. Start from the top and work your way down, spraying smoothly from side to side. Keep the wand angled down as much as possible to avoid getting water under the laps of the siding, or the siding could buckle under pressure.
Step 8: Avoid certain areas
Do not directly spray light fixtures, windows, vents or eaves. The high pressure of the water could cause serious damage when aimed poorly.
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When to pressure wash before painting
Pressure washing is an essential step in preparing surfaces for painting, as it removes dirt, residue, and loose paint, ensuring better paint adhesion and a longer-lasting paint job. However, the timing and technique of pressure washing are critical to avoid potential issues.
When deciding when to pressure wash before painting, it is crucial to consider the surface type, the climate, and the time needed for the surface to dry thoroughly. For example, wood siding takes longer to dry than vinyl or aluminium siding, and insufficient drying time can result in moisture issues and paint adhesion problems.
In terms of timing, it is generally recommended to pressure wash at least two days before painting to allow the surface to dry completely. This timeframe can vary depending on weather conditions and the type of surface being painted. For instance, in warm and dry climates, pressure washing a day before painting may be sufficient. However, in humid conditions, allowing a couple of days to a couple of weeks is advisable to ensure the surface is entirely dry.
It is worth noting that pressure washing too early may result in the accumulation of dust and dirt on the cleaned surface, requiring additional preparation before painting. On the other hand, pressure washing too late can leave pockets of water, especially in materials like vinyl siding, which can run down freshly painted surfaces. Therefore, finding the right balance is essential.
When pressure washing, it is crucial to use the appropriate pressure and techniques for the specific surface. For instance, cedar siding requires low pressure to avoid damage, while wood siding may require specific angles to prevent water from getting into the boards. Using the correct pressure washer tips and settings is vital to effectively remove dirt and residue without causing damage.
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Alternative methods to pressure washing
If you're looking for alternatives to pressure washing your cedar siding, there are a few methods you can try. Firstly, it is important to assess the root cause of the dirtiness. One of the biggest reasons for cedar siding to darken and look dingy is mould and mildew.
Oxygenated Bleach
One method is to use oxygenated bleach. This can be mixed with water and applied to the siding to remove mould, algae, and mildew. It is important to follow the manufacturer's instructions when using this product. You can also use a mixture of oxygen bleach and oxalic acid to clean and prep cedar siding for refinishing.
Soft Washing
Soft washing is a gentler alternative to pressure washing that uses lower pressure settings, typically below 1800 PSI. This method can be combined with specialised cleaning solutions to effectively remove dirt, algae, and mildew without damaging the wood.
Hand Washing
For smaller areas or more delicate siding, hand washing with a soft-bristled brush and a mild detergent solution is an option. This method takes more time and effort but allows for greater control and gentleness.
Garden Hose
Using a simple garden hose with a decent spray nozzle can be an effective way to remove dirt and debris from cedar siding. This method is gentle yet consistent and can be used every 6-12 months for optimal results.
Chemical Stripping
If your paint is peeling, flaking, or bubbling, you may need to remove the old paint through a chemical stripping process before repainting. This will provide a clean, even foundation for the new coat of paint.
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Frequently asked questions
Power washing cedar siding can get rid of ugly stains, mildew, and loose paint. However, it is not necessary to power wash cedar siding before painting it. Painting cedar siding without power washing it first will not cause any issues with the paint application.
Cedar is a softwood, and high-pressure water can easily damage it. Power washing cedar siding can cause splintering, etching, or stripping away of wood fibers. It can also cause water to get into the walls, which can lead to moisture problems.
To power wash cedar siding safely, it is recommended to use a low-pressure setting and specialized cleaning solutions. Soft washing is a gentler method that uses lower pressure settings, typically below 1800 PSI, to clean the siding without causing damage. It is also important to identify the specific type of cedar siding and adjust the cleaning approach accordingly.







































