Place the first deck board on top of the stringers flush with each side stringer and tight to the spacers on the deck frame. Install the treads first in this instance. 10 ½” would be the length of the run on the stringer. Two deck boards 5 ½” + 5 ½” + ¼” for spacing = 11 ¼”. The riser material would be placed on the front and the back of the tread so it would not be deducted. In the other case where the risers were to be installed first, the measurement of the riser would not be removed from the equation. 10 ½” – ½” for the riser fascia = 10” as was determined earlier. In this case, the two deck boards, 5 ½” + 5 ½” + ¼” for spacing = 11 ¼”. If the dimensions of the treads were designed by taking away all the measurements of the nosing and riser thickness, then the treads will go on first. The stair stringer dimensions will dictate whether the treads get put on the stringers first or the risers get put on first. The decking on the treads need to be spaced ¼” apart in order to allow for expansion and contraction as well as to allow debris to easily pass through. Measure away from the deck frame 33 ¾” and mark that distance on the 2x4 clamped to the top of the frame. Three treads at 11 ¼” gives a total of 33 ¾” this is the distance the stairway will end away from the deck. In this example, there will be two pieces of 5 ½” decking on each tread, and the two pieces of decking will be spaced ¼” apart, which gives each tread a total depth of 11 ¼”. To determine how far away from the deck the stairway will end, the depth of the treads will need to be determined. The decking is 5 ½” so two pieces together will be 11”. This brings the total tread count to three. In this example, there are four rises, and there will be one less tread than rise (since one of the treads on the stairway will be the actual deck). Knowing the number of rises that are needed for the stairway will help determine the number of treads.
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