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Presentation on theme: "Stairs."— Presentation transcript:

1 Stairs

2 Objectives Be able to calculate size needed for a staircase
Apply staircase calculation to own stairs Identify types of staircase designs Gain knowledge of general size information

3 Stairway Series of steps with or without landings or platforms which is installed between two or more floors of a building Provides easy access to various levels All styles of homes have stairs except ________? Ranch Design

4 Main stairs vs. service stairs
Generally prefabricated parts and are of a much better quality than the service stairs Typically made from hardwoods (oak, maple, birch) Service stairs Typically constructed on site of Douglas fir or pine (construction lumber)

5 Seven types of stairs Straight run L stairs Double-L stairs U stairs
Winder stairs Spiral stairs (Circular stairs)

6 Straight run stairs No turns
Not as expensive as other types to construct Require a longer open space

7 L stairs One landing at some point along the flight of steps “long L”
Used when there is not enough space for straight run

8 Double L stairs Two 90 degree turns along the flight
Typically not used in residential construction Expensive and break up the floor plan

9 U stairs Wide or narrow U Two flights of steps parallel to each other
Landing between the two flights of steps

10 Winder stairs Pie shaped steps
Width of the triangular/pie shaped steps? Sufficient at midpoint Not as safe as other stairs

11 Spiral stairs Gaining in popularity
Used where little space is available Most are made from steel and welded together Not very safe

12 Circular stairs Custom made Trapezoid shaped steps
Large homes. Probably too big for your two-story houses

13 Terminology Open Stairs-stairs that have no wall on one or both sides
Enclosed stairs-have a wall on both sides (“housed” or “box” stairs)

14 Terminology Landing-floor area at either end of stairs and possibly in between

15 Terminology Rail (handrail)-
Designed to be grasped by the hand. They are supported by posts or fixed directly to a wall. Baluster- Vertical member that supports the handrail.

16 Terminology Newel-main posts of the handrail at the top, bottom or points in between where stairs change directions

17 Handrail Newel

18 Terminology Stringer (string’ er)- structural member that supports the treads and risers Two are usually sufficient. But if width exceeds 3 feet, a third stringer is needed Plain stinger Housed/closed stringer

19 Plain Stringers Made from fir
Risers and treads nailed directly to the stringer Service stairs, main stairs if they are carpeted Sturdy Squeaky and do not have a finished appearance Risers are 1in and treads are typically 2in

20 Housed Stringers Made from finished lumber
Generally precut or preassembled Stringer is routed to hold the treads and risers Wedges are driven in to hold in place Glued and nailed in place

21 Terminology Nosing-rounded projection of the tread that extends past the riser

22 Terminology Tread- horizontal member of each step. Usually 1 ¼” thick. Either 10½”(most popular) or 11½” deep Run-the distance from the face of one riser to the face of the next Total Run-total horizontal length of the stairs 10-1/2” 10-1/2”

23 Terminology Riser-vertical face of a step. Usually ¾” thick, between 7” and 7 5/8” high Rise-distance from the top of one tread to the same position on the next tread Total Rise-total floor-to-floor height 7” – 7 5/8” 7” – 7 5/8” 7” – 7 5/8”

24 Terminology Headroom-shortest clear vertical distance between the nosing on the treads and the ceiling (6’-8” minimum) 6’-8” min.

25 Rules Stairs should be minimum 3’-0” wide (traffic circulation rule)
The slope of the stairs (rise-run ratio) should be between 30 and 35 deg The sum of two risers and one tread should equal approximately 25 in The product of the riser height multiplied by the tread width should equal appox. 75in The sum of one riser and one tread should be inches

26 Procedures What is your Ceiling Height of your first floor?
Example Problem: What is your Ceiling Height of your first floor? (Standard ceiling height: 8’ - 12’) _________ Add together: finished floor to finished ceiling (Ceiling Ht.) ________ thickness of ceiling material (drywall) .5” width of floor joists (2” x 10”) 9.5” thickness of subfloor (.5” plywood) .5” thickness of finished floor ” Total Rise = ________ 10’-0” Ceiling Height 10’-0” 10’-11 ¼ ”

27 Procedures Convert Total Rise from feet to inches.
[ _________ x 12 ] + _________ = __________ Divide Total Rise (inches) by 7” (min. riser height) to find the total number of risers for your stairs. _________ = __________ 10 11 ¼ 131.25” # of feet leftover inches Total Rise (inches) 131.25” 18.75 Total Rise (inches) # of Risers

28 Procedures If your Total Riser # is a decimal, plug the whole number into the equation below, WITHOUT the decimal part: Example: If the Total Riser # is 22.18, plug in 22 _________ _________ = __________ The numbers below would allow you to draw elevations How many Risers do your stairs have? ________ What is the Height of Each Riser? ________ 131.25” 18 7.29” Total Rise inches # of Risers (w/out decimal) Height of Each Riser (inches) 18 7.29”

29 Procedures Calculate Total Run
_________ x [_________ - 1] = __________ Convert Total Rise and Total Run back into Inches. _________ = __________ (For Elevations) _________ = __________ (For Floor Plans) 10.5” 18 178.5” Tread Depth # of Risers Total Run ***THERE IS ALWAYS ONE LESS TREAD THAN RISER 131.25” approx. 10’-11” Total Rise (in) Total Rise (ft/in) approx. 14’-10” 178.5” Total Run (in) Total Run (ft/in)

30 Neat-looking Stairs

31 Neat-looking Stairs

32 Neat-looking Stairs

33 Neat-looking Stairs

34 Neat-looking Stairs

35 Neat-looking Stairs

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