Wear a dust filter or damp cloth over your nose and mouth. Cover yourself, but if your skin gets ash on it, wash it off as soon as possible. Keep doors and windows closed when ash is seal windows with tape clean glass surfaces. Don't let ash build up. Volcanic ash is heavy and could cause damage to roofs and guttering.
Light falls can also set in gutters and downpipes and cause problems.
Use a broom to get the ash off. Be sure to clear out the gutters. Try to stop ash getting into stormwater drains. Divert downpipes if necessary. If you are on tank supply, remove inlet pipes.