Unit 10 - Stairway Construction

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Unit 10 - Stairway Construction
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Stairway Construction

• For the installation of landscape decks, often
  times Landscape Contractors will have a
  difference in elevation between the deck surface
  and finished grade.
• This elevation is known as the TOTAL RISE of
  the deck. The total rise of the deck is an
  important measurement for staircase construction,
  because it will influence the amount of steps
  needed and the length of the staircase.

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Stairway Construction

• For safety reasons, it is important to have steps
  of equal height and width. Steps of unequal
  heights and widths can throw off the Stride of
  the person climbing the stairs, and result in a
  fall, and possible injury.

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Stairway Construction

• Nomenclature..
• Total Rise - is the total height of elevation
  from finished grade, to the top of deck surface.
• Total Run is the horizontal length of the
  staircase, and the amount it will protrude from
  the deck.
• Riser is the actual height of the step. Average
  riser height is 7.5 inches, and they must be
  consistent from the top of the staircase to the
  bottom.

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Stairway Construction

• Nomenclature..
• Tread is the width of the step, and also must
  be consistent throughout the staircase. Treads
  are typically 10 wide.
• Nosing is the amount of overhang each tread
  has, typically 1-1 ½.
• Stringers - are the side boards which hold the
  risers to the treads and the staircase to the
  deck. They are typically made of 2X10 or 2X12
  boards, and are referred to as CLOSED or OPEN.

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Stairway Construction

• The 4 rules of Stair construction..
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• RT 17.5 /- 1
• Example 7.5 rise 10 tread 7.51017.5

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Stairway Construction

• The 4 rules of Stair construction..
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• R X T 75 /- 3
• Example 7.5 rise 10 tread
• 7.5 X10 75

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Stairway Construction

• The 4 rules of Stair construction..
• 3
• 2R T 25 /- 1
• Example 7.5 rise 10 tread
• 15 X10 25

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Stairway Construction

• The 4 rules of Stair construction..
• 4
• Slope should not exceed 35 degrees.

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Stairway Construction

• Another helpful formula..
• C A B

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