How Do You Clean Composite Decking?
Cleaning composite decking involves understanding the specific requirements of the material you're working with. Here are some commonly asked questions and their answers:
Can I Use Bleach on a Trex Deck?
Yes, you can use bleach (sodium hypochlorite) to clean a Trex deck. However, be aware that it may lighten the color of the decking. Always perform a test spot before full application. Start with a light mixture and increase strength as needed.
Is it Safe to Use High Pressure on Composite Decking?
Not always. Each manufacturer has specific guidelines for the maximum pressure that can be used on their decking materials. Follow these guidelines to avoid damaging the deck.
Will Pressure Washing/Soft Washing Void the Warranty?
Yes, it can. Using cleaning methods outside the manufacturer's recommended guidelines can void the warranty if any damage occurs. Always check the manufacturer's instructions before proceeding.
Manufacturer Guidelines: Trex Decking
Trex is one of the most common composite decking materials. Here are the guidelines from Trex:
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Pressure Washer Use: A pressure washer with no greater than 3100 PSI, a fan attachment, and a soap dispenser can be used to remove dirt or mud. Spray the deck with soap, gently scrub each deck board with a soft bristle brush, and rinse thoroughly with a fan tip no closer than 8 inches from the surface. Ensure all dirty water is rinsed off to prevent a film from drying on the deck.
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Mold Removal: Clean the deck periodically to remove dirt and pollen that can feed mold. If mold colonies appear, use a commercial deck wash containing a detergent and sodium hypochlorite. Note that this will lighten the wood surface.
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Older Trex Models: Trex does not recommend using a pressure washer on older deck surfaces as it can damage the decking and void the warranty.
Cleaning Different Composite Decking Brands
Different composite decking brands have unique cleaning requirements. Always talk to your customers about the type and age of their decking before cleaning. Here’s a quick guide for the top composite decking brands:
| Brand | Max PSI | Bleach (SH) | Additional Notes |
|---|---|---|---|
| Cali-Bamboo | 1500 PSI @ 12” above deck | No | Warm, soapy water is recommended for cleaning. |
| DuraLife | No Pressure Washing | No | Laundry detergent without bleach is recommended. |
| Envision Composite Lumber | 1000 PSI Max | Yes | Oxalic acid and phosphoric acids are also suitable for cleaning. |
| Fiberon | 2500 PSI @ 12" above deck | Yes | Pressure washing is not recommended if mold or mildew is present. |
| Lumberock | 1800 PSI with a 20-degree nozzle | No | Lacquer thinner and CLR can also be used for stubborn stains. |
| Moisture Shield | 1300 PSI @ 10" above deck | Yes | Allow 3-6 months of aging before any cleaning; some products can lighten the surface color. |
| TimberTech | 1500 PSI Max for Rinsing Only | No | Sodium metasilicate is a recommended alternative. |
| Trex | 3100 PSI* (No PW for older models) | Yes* | The use of SH can lighten the color of the decking. |
Best Practices for Cleaning Composite Decking
- Determine the Recommended Process: Always check with the manufacturer for their recommended cleaning process. This information is typically available on their websites.
- Test Spot: Before a full cleaning, always do a test spot in an inconspicuous area, such as the underside of the deck.
- Appropriate Cleaning Methods: Use a mixture of soft washing, pressure washing (following manufacturer guidelines), or manual cleaning with a soft bristle brush.
Links to Manufacturer Cleaning Guides
- Trex Care and Cleaning Guide
- Cali Bamboo Care and Maintenance
- DuraLife Decking Care and Cleaning Guide
- Envision Composite Lumber Care and Cleaning
- Fiberon Maintenance and Care
- Lumberock Cleaning and Care
- Moisture Shield Cleaning and Care
- TimberTech Care and Cleaning
By following these guidelines and always verifying with the manufacturer, you can ensure safe and effective cleaning of composite decking, maintaining its appearance and longevity.
