Wood rot occurs when water once again hits these dead cells. The combination of water and UV exposure causes the cedar to lose it's scent and colour, turning it into a dull grey. The wood rot on the cedar creates an ideal breeding ground for mold and mildew, which is both unattractive and detrimental.
To prevent cedar from fading to gray, you need to seal cedar fence with a stain that blocks ultraviolet light and contains a mildewcide, according to Family Handyman.
Just take a pump up sprayer and add Clorox bleach ( must use clorox brand) 1 part bleach and 2 parts water. When you spray it on the fence the gray washes off and the board looks new again.
The sealer will protect your cedar for several years. The exact amount will depend on the brand you use. But, you still want to sweep and wash your cedar area at least once a year to keep it from graying. Cedar is a beautiful red wood, but can turn gray if not properly cared for.
Sometimes its as early as 2 months, and other times it takes a year for the grey to set in. This is why stain is so necessary for your cedar wood. It keeps out the water, so those cells can keep doing their thing. But remember: Once your fence is installed, it can't be treated right away.
Cedar should be stained as soon as it will accept the stain. This is easy to determine with penetrating semi-transparent stains. Apply the stain, if it soaks in its ready. If it pools on the surface, do it later.
Don't put cedar where it's in direct contact with the ground or set it in concrete. It may last for a while, but eventually it will rot and deteriorate.
Cleaning. If your siding's fresh color lays buried under a gray, weathered surface and mold, buy a bleach-based cleaning solution or mix 3/4-cup of bleach with 1-gallon of water to restore or salvage the cedar's luster.
The best way to restore your cedar siding or cedar fence to its original glory is with soft washing. Instead of the robust streams of high-pressure water used in pressure washing, soft washing uses a low-pressure technique with a special mixture of highly effective and biodegradable cleaning solutions.
Boiled linseed oil, despite not providing much water-resistance to wood when applied in the usual way associated with furniture, will do much to slow the weathering to that natural grey/silver colour if applied heavily and re-applied periodically.
Once cedar has turned gray, there is no natural way of going back. The only alternative at this point is to tone the wood with a stain or other coloring agent. Maintaining your cedar's color is about choices, timing, and above all, the right type of treatment.
However, cedar that is destined to live outdoors needs some special care and attention. Specifically, it needs to be treated with a good wood stain. Otherwise, your nice cedar color will fade to a dull, nasty grey.
Scrub the fence with a wood cleaning detergent or a 20-percent solution of chlorine bleach that contains 1 part bleach and 4 parts water. Spray the fence with a garden hose and use a long-handled scrub brush to scrub the pickets from top to bottom, paying particular attention to the mold, mildew and algae.
Cedar offers a durable option for exterior and interior building projects with natural resistance to rot and decay, so a protective finish is optional. If you want to enjoy the aroma of varieties such as Western Red Cedar and incense cedar, leave the wood unsealed.
The most common culprits are tannins, mildew, and mold. Tannins ordinarily leach from cedar wood, and do not normally cause any problems. However, when tannins mix with metal and iron, a chemical reaction occurs and a black stain can form. Cedar, along with any other wood, is a natural habitat for mildew and mold.
Caution. Transparent, non-flexible, film-forming finishes such as lacquer, shellac, urethane, and varnish are not recommended for exterior use on cedar. Ultraviolet radiation can penetrate the transparent film and degrade the wood.
Staining Old Cedar:
If a few steps are performed, staining an old cedar siding comes out almost flawlessly. You should always remove all old flaking paint or stains on the top layer of wood by using power washing.
One part white vinegar to 3 or 4 parts water is fine. Dip a sponge in the vinegar solution, and wipe it on the bleached wood. Rinse the sponge in clear water before dipping it again in the neutralizing solution. Once the cedar is dry, you can leave it as is or apply the finish of your choice.
Oil-based stain is one of the best options for finishing a cedar chest. Oil stain penetrates deep into wood fibers to bring out grain patterns, no matter what the species.
Longevity
Cedar siding must be properly maintained at all times to reach its maximum lifespan, with many planks needing to be replaced after just 10 to 15 years, and even well-maintained cedar siding may only last around 20 to 30 years in some climates.
Wipe Down the Exterior
Moderate– Murphy's Oil Soap or White Vinegar (especially if there is mold or mildew spots). Use a lint free cloth, wring out excess moisture and wipe down the exterior.
For outdoor use, cedar furniture is widely viewed as a good choice. Less expensive than teak and lighter than oak, cedar possesses many major advantages that make it suitable for outdoor placement. Keep the benefits of cedar in mind when deciding which type of furniture to add to your garden or patio area.
Aromatic red cedar has a Janka rating (used to test the relative hardness of wood) of 900, while southern yellow pine is behind by a bit with a Janka rating of 690. So cedar is a little harder.
First of all, cedar deck boards can shrink and expand depending on how high or low the humidity levels outside are. If it is especially dry outside then cedar wood will contract and shrink and if it is quite wet outside or it the humidity levels are high then cedar deck boards will expand.