Published at Monday, 17 September 2018. Stair. By Christina Finke.
Proper stair design has a maximum rise of eight inches, a minimum run of nine inches and a minimum tread width of 9.25 inches. A safe and properly configured stairway should be at 34 inches wide. As a rule the wider steps are safer then narrow stairs. There needs to be adequate headroom above the set of stairs. The required headroom is at least 6 foot 6 inches. When there is a door at the top of a set of steps, it should open away from the stairs for safety reasons. If a door opens toward the stairs a landing is needed so a person opening the door will not be able to push someone on the stairs.
Stair lifts are devices that are attached to the treads of staircases to safely move someone who is elderly or disabled up or down the stairs. They consist of a track, usually made of aluminum, a chair attached to the track, and the electronic controls that make the chair move up or down the track. Stair lifts are powered by alternating current (AC), which is hooked up to the household electrical system, or with direct current (DC), which uses a battery that recharges from the household electrical system, and does not require use of home electricity to work properly.
Starting with two parallel 2x6 stringer members, the adjustable brackets are first positioned using a spacing tool and then attached to each member with a single "pivot screw". For finished interior stairs, the stringers may be "paint" grade or "stain" grade but will have a tongue and grove or spline milled into the parallel mating surfaces so that once the brackets are adjusted, the mating surfaces will be pushed together to form a continuous, decorative, one piece knee wall stringer. The remaining screws are inserted and the end cuts are made. All the risers and treads are now square cut to the exact length using a chop saw. It is recommended that a stop is used for accuracy and efficiency. The treads are usually cut slightly shorter than the risers (1/64") for fit. For fast assembly it’s best to first pre- assemble the stair and then lift into position whenever circumstances permit.
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