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.
The iron found in galvanized fasteners, as well as some window screens and flashings, can cause blue or black stains on cedar. These stains don't respond to oxygen bleach. Instead, use a wood bleach containing a 5 percent oxalic acid solution to remove the stains.
Tannins protect the living tree, but can cause unsightly darkening of your cedar shake siding. Apply the mixed wood brightening solution to the siding. Allow it to remain on the surface for 30 to 45 minutes. Rinse the siding with water.
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.
Mold can grow on cedar when high relative humidity exists. The high humidity results in a moist atmosphere due to the excessive water vapor. The vapor clings to the porous cedar and can contribute to mold growth.
Cedar will help prevent the spread of mold and mildew. Cedar removes moisture from the air, so in humid climates, it will act as a natural dehumidifier and keep your clothes from developing mildew.
The Cedar Bureau recommends using a solution no stronger than one-part bleach to three parts water. Apply it with a pump sprayer and let it sit for about 15 minutes before rinsing it off with a garden hose. Be sure to keep the hose pointed downward to avoid forcing water up behind the shingles.
After cleaning your cedar to bring back its color, apply a clear exterior varnish to help sustain it. A quality weatherproofing product will prolong the fresh look of your cedar and help limit algae growth. If you would prefer your siding stained another color, choose a stain that is darker than the cedar.
Semi-transparent stains are your best bet when you want the real look of slightly weathered cedar with protection. The few solid particles in this mix will not significantly obscure cedar's wood grain. However, with semi-transparent stains, you will need to take care with the application.
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.
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.
Although cedar is naturally resistant to rot and decay, staining your siding promptly will help in the preventing of deterioration.
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.
According to Dwight Barnett, a certified master inspector with the American Society of Home Inspectors, power washing can be successfully applied to cedar siding safely as the setting is turned to low pressure.
A safe deep-cleaner for wood siding is oxygen bleach. It is a powder that mixes with water. It is non-toxic to vegetation and trees and will not remove any natural color from the siding. You simply keep the wood siding wet with the oxygen bleach solution for 15 minutes.
The best woods for bleaching include oak, beach, ash, and gum. Varieties like poplar and pine are already so light that removing further natural wood color might render them bland and lifeless. Others, like cedar, redwood, rosewood, and cherry don't take bleach well.
If you leave cedar wood untreated, it will not succumb to the devastating effects of mold, rot and insect damage. However, it will lose its typically golden-brown color.
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.
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.
If left in its natural state, some darkening of the wood can be expected as it ages and the color variation will become less pronounced. Application of transparent finishes will also darken western red cedar to some degree but they form a protective surface that is easier to maintain.
Yes you can paint the gutters. Have the painters spray them. The cedar can be stained with a semi-transparent or opaque stain.
You can use water mixed with a bit of mild detergent for a basic cleaner. If you need a stronger cleaner, you can dilute bleach with water for a cleaner that will accentuate the natural luster of the cedar. This is particularly effective in the removal of mildew. Wipe the wood gently, and avoid excessive scrubbing.
“The safe and effective way to clean the wood is oxygen bleach. The oxygen bleach comes as a granular powder that mixes with water.
Chlorine bleach is the traditional and most popular form used in households, most often in the washer to get stains out of laundry. The powerful ingredient is sodium hypochlorite, which is a toxic substance and is not good for your cedar siding, as it can damage the wood fibers.