David Valley's Real Estate/Home Inspection Blog


Deck Maintenance

Your deck is a valuable asset to your home. Its surface is constantly exposed to our weather extremes causing the wood to crack, fade, split, splinter, cup and warp. The majority of decks in New England are made from pressure-treated pine. Although pressure-treated wood resists insects and decay, it's still vulnerable to moisture, freezing and the sun's rays. The same applies to other exterior woods including Cedar, Cypress and Mahogany. To keep it looking new and lasting much than the average deck, a regular maintenance treatment system is necessary. Approximately once a year, your deck should be checked for loose railings, balusters, walk boards and protruding nails. Then it should be thoroughly cleaned, and resealed.

Take the time to examine all the wood carefully, to see if any boards have rotted. Unfortunately, most wood rot occurs in places that are hard to see; Under the decking boards, at the ledger (the horizontal board that is attached to the house), on the underside of stair treads, and the exposed end grains of all decking. If possible, crawl underneath your deck to thoroughly perform your inspection. If your deck has wood posts or stair stringers that penetrate the dirt, probe the bearing ends for rot. Replace if necessary and this time use concrete footings to separate the wood from the dirt. Here in Massachusetts, the footings should be poured 3 1/2 to four feet deep (due to our frostline) and should terminate above ground approximately 3 to 6 inches high. It's always good to install cleats under the post to separate it from the concrete footing, which can become moist.

Cleaning will involve the removal of dirt, algae, moss, and other organic matter. In accordance with the directions that come with the cleaning solutions, it may be necessary to hose down the deck and surrounding area before applying any cleaning solutions. The water will also help dilute any chemicals that may inadvertently come into contact with surrounding plants and grass. Even with mild solutions, care must be taken to limit the amount of solution that gets on nearby plants and grass. Many cleaning solutions contain bleach, which is toxic to plants when in concentrated form. The solutions can be brushed onto the deck using a broom or can be lightly sprayed on with a power washer under low pressure. Power washers under excessive pressure can ruin the grain on your decking.


You can also give your wood surfaces (oiled, oil-stained, or painted) a good scrubbing using the following home-made formula...

1 cup of powdered laundry detergent

1/2 cup liquid chlorine bleach (if moss is present)

1 gallon of hot water


After waiting the directed length of time for the chemicals to do their work, the deck should be thoroughly rinsed. This is the step where more power can be particularly helpful, as water under low pressure can rinse out both dirt and chemicals more effectively.

However, too much pressure can gouge wood or cause the grain to become exaggerated. Within wood, the visible grain marks differences in density and hardness. Part of each grain is relatively soft wood. This softer wood can be gouged if too much pressure is used. At still higher pressures, even the harder parts of the grain can be damaged. Do not get too close to any wood when using a pressure sprayer.



If you plan to refinish the wood after cleaning, allow the wood to completely dry before applying the finish. Once dry, resealing is accomplished by applying a clear or semi-clear liquid sealant to all exposed surfaces. Homeowners can do any of these tasks themselves, but often don't do them as well as a professional.



If you plan on staining your deck, look for a Stain that is designed specifically for decks. Well-meaning do-it-yourselfers often end up applying stains designed for vertical surfaces, such as siding. Stains designed for use on vertical surfaces are not as abrasion resistant as those made for decks. Deck stains are made to resist scuffing where lots of traffic is expected. Always apply an oil or oil-stain finish either early or late in the day when the wood is not in full sun. The thinner that helps the oil penetrate evaporates too quickly on hot days. The oil can end up laying on the surface. Then help to force the oil or oil-stain into the surface by going back over the entire area with a paintbrush or roller (called back brushing)


Alternatives to Traditional Decking Materials

If you do not have time to maintain a traditional wood deck, there are now new decking material options. Several companies are now producing new composite decking materials that are resistant to rot, do not warp or splinter, maintains its shape, does not shrink or expand and doesn't require periodic staining. Most are made of recycled plastic or a blend of wood and plastic called Composite Decking. One brand name is that I'm familiar with is Trex Decking.

Composite decking weathers, like wood, but will age to an even tone without deteriorating. Composite decking does lack the strength of wood, however, and wont span the same distances as wood. With appropriate structural support, composite decking is well suited to first floor and above ground decks. Plastic structural beams are not readily available in all markets and tend to make the deck bouncy, so pressure-treated wood is most commonly used to support this type of decking. While widespread experience with this product is just now occurring, results look very promising. This material is more expensive initially than the common wood products used today, but they offer large savings over time due to their low-maintenance.

There's also a lifetime vinyl railing system that you can have installed with the composite decking, that'll last much longer than tradional wood. These plastic products will last a lifetime.

Comment balloon 2 commentsDavid Valley • June 13 2009 06:16AM
Deck Maintenance
Your deck is a valuable asset to your home. Its surface is constantly exposed to our weather extremes causing the wood to crack, fade, split, splinter, cup and warp. The majority of decks in New England are made from pressure-treated pine. Although… more