Brand new wood shingles and siding clapboards sometimes look too new for their owners. Many homeowners prefer the look of well-weathered, aged wood. If you're among them, you can get the same look out of your freshly installed shingles and siding.
Plan ahead for this treatment by looking at the weather report. This treatment should be done early in the morning on a hot or warm and sunny day.
Wait until after the morning dew and sunrise on the day you plan to work, but get started well before the hottest part of the day. Fill your sprayer with approximately 1 gallon of water, then pour in about 1 lb. of baking soda. Stir the mixture around with a long stirring stick for a few minutes until the baking soda is fully dissolved.
Spray all of the wood siding and shingles on your home with a liberal coating of the baking soda mixture. Start with the east-facing side of the house and save the west-facing side for last, as this process depends on sunlight to work. Use a ladder to reach roofing shingles. If your sprayer is powerful enough and has a long enough wand attachment, you may be able to spray your entire roof without stepping off the ladder.
Mix additional batches of the weathering formula as needed, but continue spraying until all of the wood you wish to treat has been sprayed. By the afternoon, all of the treated areas should look well-weathered, giving your home an antique look and feel.