Measure the staircase from the nosing of the first stair to the floor at the bottom of the staircase. Add 12 inches to this measurement. Codes require that the railing follow the full length of stairs with either the top or bottom of the rail extending 12 inches or more beyond the staircase length.
It is sometimes used topically to treat skin and tissue damage caused by chemotherapy when it leaks from the IV that is used to deliver it. DMSO is used either alone or in combination with a drug called idoxuridine to treat pain associated with shingles (herpes zoster infection).
DMSO application instructions: How to apply DMSO topically. DMSO application can involve applying it directly to your skin with your hands. If you prefer not to use your hands, you can use a cotton ball or a paint brush. If you are using liquid dimethyl sulfoxide, allow it to dry for about 20 minutes. Then you can wipe off any excess.