Any wood or wood composite will require some maintenance especially in a wet climate on the north side... check the source:
I found this at http://www.timbertech.com/warranty/care.asp
[quote]
Basic Cleaning Recommendations
TimberTech highly recommends periodic cleaning of your TimberTech deck to help maintain the beauty of the product. Most deck-cleaning products will work on TimberTech. For best results use a cleaner that contains any of the following as an active ingredient for general cleaning and follow the manufacturer’s instruction for use:
• Phosphoric Acid
• Oxalic Acid
• Hydrochloric Acid
• Sodium Hypochlorite
Power washing will enhance results when cleaning your TimberTech deck. 1500psi is the recommended maximum for TimberTech products. A fan tip nozzle should be used along with the proper cleaning product. Spray in the direction of the brush/grain pattern to avoid damaging your decking. Use caution not to damage the material and always take the proper safety precautions when operating a power washer.
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Here is a video:
http://easylink.playstream.com/timbertech/6_deckcare.wvx
Here is what they have to say on MILDEW:
[quote]
Mildew
Wash your deck periodically with a cleaner like Zinsser's JOMAX (www.zinsser.com) that contains or is mixed with Sodium Hypochlorite. Follow the manufacturer’s application instructions. Use a stiff brush to scrub heavily stained surfaces following the grain.
Rinse off your TimberTech deck periodically with a hose. Even if your deck appears clean, it is important to prevent build-up of pollen/debris. Mildew stains may occur where moisture, pollens, and/or dirt are present. Mildew needs a food source to grow, which can be grass, pollens, dirt, debris, wood and wood resins.
Maintaining a clean, dry deck surface is the best method for combating mildew. Ensure that water drains effectively from your deck. Keeping weep holes clear and unclogged on TimberTech Floorizon Planks. For TimberTech TwinFinish 5/4 and 2x6 planks, be sure that gaps exist between planks to allow for drainage.
Spot Stains
Oil Eater Cleaner and Degreaser is very effective against oil, grease and other stains. For extra heavy oil and grease stains or other specific stain types, check with your local lumberyard, hardware stores or home centers for cleaners applicable to a specific stain type.
If stains have set, you may want to use fine sandpaper and sand lightly, following the wood grain finish of the plank. The sanded area will weather back in approximately 8-10 weeks.
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