Should a Deck Be Sanded Before Growing?

Even preservative-treated timber and redwood decks finally suffer with discoloration, weather damage and other problems when used without a sealer or other end. Outdoor wood is susceptible to heat, cold, water and dry conditions, which can make it swell, shrink and crack. Implementing a waterproof sealer into the deck will allow it to stay looking its very best. However, it’s very important to prepare the wood correctly before sealing to ensure a good bond.


Brand-new decks might not need cleaning before they get a coating of stain or sealer. However, an older deck hastens dirt, algae and surface grime that can keep deck sealers from adhering properly. Utilize a detergent-based deck cleaner or a oxalic acid-based deck restorer. Some deck owners eliminate dirt by means of a pressure washer, but this might not get rid of coatings. If the deck has a previous coat of paint or has been sealed with varnish previously, use a deck stripper to remove the old finish.


Some decks, notably unsealed decks which have been exposed to weather, have tough surfaces which will not take sealers well. Pressure-washing the deck can eliminate rough pieces of wood and smooth the outside, according to Steve Maxwell, professional carpenter and house improvement writer. Homeowners can also sand all surfaces with a power sander, a handheld oscillating tool plus also a 60- or 80-grit sanding accessory or by hand with sandpaper. Decks do not need fine sanding.

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Implementing deck sealer too soon can actually maintain moisture within the wood, inducing complete cracking and other problems in the future. While deck owners no longer need to wait two months or a year after installing the deck to complete it, waiting till the surface is totally dry and the wood includes no more than 14 percent moisture will help ensure excellent outcomes. Pick dry weather with mild temperatures and an overcast sky for the best outcomes. When temperatures are excessively high, deck sealers may cure too fast. When they’re too low, the end can remain sticky.


Even sealed decks can fade or turn gray over time because of exposure to ultraviolet radiation. When it’s important to preserve the natural color of the wood, choose a deck sealer that reduces the bleaching activity of sunlight. These sealers might want to be reapplied every few years to maintain their effectiveness. Avoid varnishes and other indoor coatings, which might not perform well in outdoor conditions.

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