Retractable attic stairs are practical in most situations where you want to go from one height to another. There are three main parts of a staircase: the trunks that go vertically; steps that go horizontally; and stringers, which are the supports. Some stairs are open stairs that do not have trunks. Open stairs provide more toe space for climbing the stairs, especially if the steps are shallower than normal.
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Check your local code for rules on uptake and run sizes and use these rules to calculate your stairs. Measure the height that the retractable attic stairs must extend. Since you cannot normally reduce the height of the stairs to bridge, this is the guiding measurement. Draw the height of the paper to help you visualize the stairs. Divide the height in inches by 7 1/2 and subtract 1. This is the number of steps you need to build. Multiply the number of steps by 11 inches; this is the distance that your staircase will span.
To make up any additional height, plan to build a bottom landing pad. Landing pads are larger than stairs to enable stopping and reorientation to the unusual height of the final stage. Plan for a three-by-four foot land at least; One foot will stretch under the Stringer stairs. Retractable attic stairs wider than 3 feet require a third notch stringer in the middle of the stairs for support. Multiply the number of stairs by the width of the stairs; multiply the number of ladders by the width of the stairs to determine how many onboard feet 7 1/2-inch riser you need. To calculate how long a stringer you need, square the height and length of the stairs and add these numbers together;
This post topic: Attic Stairs