What goes up and down but never moves?. STAIRS Objectives Students will… – Identify and define...
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![Page 1: What goes up and down but never moves?. STAIRS Objectives Students will… – Identify and define the pieces within a basic set of stairs – Calculate the.](https://reader036.fdocuments.in/reader036/viewer/2022062423/56649e9f5503460f94ba0ce8/html5/thumbnails/1.jpg)
What goes up and down but never moves?
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STAIRS
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Objectives
• Students will…– Identify and define the pieces within a basic set of
stairs
– Calculate the proper dimensions and layout for the rise and run of a standard stringer, given a total rise.
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Total Rise – The total height from one finished floor to the other finished floor
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Total Run – The total length of the stairs
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Risers – The vertical member of the stairs
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Treads – The step
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Stringers – The structure of the stairs, usually 2 or 3 2x12’s
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Nosing – The extra lip on the tread
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Landing – The beginning or end of each stairs, sometimes in the middle of a flight of stairs
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Balusters or Spindles – Vertical pieces under the handrail, to prevent falling off of stairs, no more than 4” apart
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Handrail – To help in assisting someone up or down the stairs
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Kicker – A 2x4 let into the bottom of the stringers to prevent the stairs from “kicking” out
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Hanger – Usually ¾” plywood attached to the top section of the stringers to mount the stairs to the floor above
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Skirt board – Decorative trim board that goes along either side, usually, of a closed stairway
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Newel post – Supports the handrail, can be decorative, found at the base of the stairs
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Steps To Figure Rise And # Of Stairs
• Calculating riser height video – 3 minutes
• For all stair layouts you must know:– # of risers and height, # of treads and depth
• Knowing the rise and run are the most crucial item in determining risers and treads.
• NEVER go off of a set of blueprints when determining risers and treads
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Steps To Figure Rise And # Of Stairs• From your rise and run of your stairway opening, you will be able to determine 4
things: – # of risers, riser height, # of treads, and tread width
• Divide total rise (in inches) by 7 ½”
• Round answer UP to nearest WHOLE NUMBER – THIS IS THE # OF RISERS
• Divide total rise by # of risers – THIS IS THE RISER HEIGHT
• # of risers MINUS ONE = (# of treads)
• Divide run by NUMBER OF TREADS
• *** IF YOUR RISER HEIGHT OR TREAD DEPTH DO NOT FALL INTO THE ACCEPTABLE RANGE YOU MUST INCREASE OR DECREASE THE NUMBER OF RISERS!**
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Turn a Decimal into a Fraction
• Multiply the decimal amount only by 16 (to get sixteenths of an inch)
• The new whole number is the new numerator (top half of the fraction)
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Stair Guidelines• 2 Risers + 1Tread ~ 25 (1 riser + 1 tread ~ 17)
• Treads should be about 10” TO 12” wide
• Risers should be about 6 ½” TO 8” high
• Minimum headroom from stairs to any point above should be 6’-8”
• Nosing should not exceed 1 ½”
• Minimum stair width is 36” (stairwell opening to be 39”)
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Stair Guidelines• The preferred angle of a stairway should be between 30 and
35 degrees
• When laying out the first riser THICKNESS OF THE TREAD should be deducted from the bottom
• If plywood is used as the hanger how much should be taken off of the top of the stringer? NONE, YOU MAY HAVE TO ADD THE THICKNESS OF THE RISER
• While only two stringers are required, 3 stringers are considered best practice. Stringers are usually made from 2X12– ALTHOUGH ENGINEERED LUMBER IS MORE STABLE AND STRONGER
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Stair Guidelines• A FRAMING SQUARE is used to establish the height of the
HANDRAIL
• Handrails should be CLOSED in accordance with building and fire codes.
• Handrails help people up and down the stairs
• Spindles help prevent FALL-THROUGH and must be no further than 4 inches apart.
• When attaching the treads and risers using CONSTRUCTION ADHESIVE and SCREWS is the best practice.
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Stair Layout
• Stair Layout – 24 minutes
• Circular Saw Safety – 25 min
• Saw blades – 7:30 minutes