Slowness of movement (bradykinesia - pronounced 'bray-dee kin-eesya') is one of the classic symptoms of Parkinson's disease. Over time, patients develop a stooped posture and a slow, shuffling walk. This gait gradually becomes erratic and unsteady, and may lead to falls.
Re: Skirt Board On Existing Stairs. Or....just lay a 1 X 12 on edge running up the stairs, resting on the tips of the treads. Scribe down to the treads the right amount to make it line up with your 4-1/4 base. Use a framing square to mark for riser cuts. Then if the risers are angled back as they sometimes are in a carpeted situation, scribe the skirt board back after it has been scribed down. This will usually require that 2 boards be connected together to cover the entire length of the stairs.
Local authorities often have differing code requirements for special staircases, so homeowners who are interested in an ATS for residential use should check their local code requirements before ordering. Lapeyre Stair's alternating tread stair is manufactured for industrial applications. The alternating tread stairs does meet the requirements of major industrial building codes (OSHA, BOCA, IBC, etc.). For more detailed information on applicable codes, visit Lapeyre's ATS Building Code Summary.