1 Total costs (materials plus shipping and labor) for installing a straight, return or L-shaped stair can run $1,300-$7,000 or more. 2  Materials plus labor for custom-built wooden stairs, such as a sweeping circular or elliptical design, can cost $10,000-$30,000 or more, depending on the size, style and type of wood.
Make another bleach solution and pour it onto the driveway. Wait 20 more minutes for the bleach to kill the mold. Rinse the driveway thoroughly with a garden hose. Prevent future mold with a borate solution. Mix 1/4 cup of borate detergent with 1 gallon of warm water in a bucket. Pour the solution onto the driveway and allow it to dry. Don't rinse it.
Bleach itself is mostly water. Therefore, if you use bleach to kill the mold, you must make sure the treated area dries quickly, ideally within 24-48 hours. Be sure to spray your cleaning solution from the bottom log to the top log, or you will have streaks which are almost impossible to remove. Once the area has been cleaned and washed, and after the wood is dry, immediately stain the area. This will seal the wood and prevent future mold issues.