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Staircases BCGCA3016B

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Types of Stairs Straight Open Riser Dogleg Closed Riser Definition – Flights Between Landings 1 Flight 2 Flights

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Straight Open Riser

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Stair Types

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Double Closed Stair Stair Types

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Double Open Sided Stairs

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In this case one side is closed while the other is open

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Note The Bracketed Stairs refers to decoration & Cut String Also Known as Cut String

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Quarter Turn Stair Open Newel Stair

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Spine String Stair

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Types of Stairs Geometric Spiral

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Types of Stairs Quarter Turn

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Parts of Stairs

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Half Space Landing Change stair direction 180⁰ Landing width = width of stair (min 750mm) Used in Dogleg Stairs

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Quarter Space Landing Change Stair Direction 90 ⁰ Landing Width & Length = Stair Width Forms Quarter Turn Stair (min 750mm)

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Intermediate Landing Allows the Stair to continue in same direction Required where more than 18 Risers May be used to give a rest Width = Stair Width Length = Stair Width or greater

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Quarter Space Landing

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Quarter Turn Stair

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Winders

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Materials Used in Stair Construction Timber Metal Stone Glass

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Timber Stairs

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Metal Stairs

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Concrete Stairs

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Stone Stairs

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Glass Stair

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Combination of Materials

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Definitions

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Rise & Going must stay the same within flight

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BCA Requirements

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Stair Requirements

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Winders Treads that are tapered Must have same rise as the flights Maximum of 3 treads per quarter turn Must be same width at centre on widths < 1m If stair > 1m same width 400mm from inside handrail

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Winders

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Calculate Stair No Restriction on Going Determine Total Rise= 2700 Select suitable Rise Say 175mm Divide Total Rise by Rise = 2700/175 = 15.429 Either 15 or 16 Risers = 2700/15 = 180mm 2700/16 = 168.75mm Use 180mm is closer to 175mm Best Going 2R + G Between 550 to 700 Midpoint = 625

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Determine Best Going BCA states that going must be within the range 2 x Rise (R) + Going(G) = 550 to 700 We can assume that the best answer is the Midpoint (550 + 700)/2 = 625 Best Going2R + G = 625 Best GoingG = 625 – 2R

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Calculate Stair No Restriction on Going Determine Total Rise= 2700 Select suitable Rise Say 175mm Divide Total Rise by Rise = 2700/175 = 15.429 Either 15 or 16 Risers = 2700/15 = 180mm (Use) 2700/16 = 168.75mm Best Going 2R + G Between 550 to 700 Midpoint = 625 Either Rise 180 Going 265 Determine Best Going 2R + G = 625 G = 625 – 2R Best Going for180 Riser265 = 625 – 2 x 180

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Calculate Stair No Restriction on Going Use Rise 180 Going 265 15 Risers 14 Goings

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Calculate Stair Restriction on Going Preferred Rise 175mm Divide Total Rise by Rise = 2700/175 = 15.429 Either 15 or 16 Risers = 2700/15 = 180mm 2700/16 = 168.75 Use 180mm Determine Best Going 3800/14 = 271.43 + 2 x 180 = 631. 43 (Closest) 3800/15 = 253.33 + 2 x 168.75 = 591 Best Going 2R + G Between 550 to 700 Midpoint = 625 Use Rise 180 Going 271.43 15 Risers 14 Goings

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Calculate Stair Flight with Quarter Turn Stair width 900mm Once an Intermediate Landing is introduced the top flight becomes constrained

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Calculate Stair Flight with Quarter Turn Stair width 900mmPreferred Rise = 165mm 2700/165 = 16.364 16 2700/16= 168.75 (3.75 Diff) 172700/17= 158.824 (6.176 Diff) Use Rise = 168.75 Best Going = 625 – 2R = 625 – 2 x 168.75 = 287.5 1800/287.5 = 6.261 6 1800/6 = 300 (12.5 Diff) 71800/7 = 257.143 (30.357 Diff) Rise = 168.364 Going = 300 Best Going 2R + G Between 550 to 700 Midpoint = 625 G = 625 – 2R

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Calculate Stair Flight with Quarter Turn Stair width 900mmPreferred Rise = 165mm 2700/165 = 16.364 16 2700/16= 168.75 (3.75 Diff) 172700/17= 158.824 (6.176 Diff) Use Rise = 168.75 Best Going = 625 – 2R = 625 – 2 x 168.75 = 287.5 1800/287.5 = 6.261 6 1800/6 = 300 (12.5 Diff) 71800/7 = 257.143 (30.357 Diff) Rise = 168.364 Going = 300 Best Going 2R + G Between 550 to 700 Midpoint = 625 G = 625 – 2R

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Calculate Stair Constrained Flight with Quarter Turn Stair width 900mm From Previous we know 15 Risers at 180 Length of 1 st Flight = 2700 - 900 Divide by Best Going = 1800/265 = 6.79 Going Either 1800 /6 = 300mm 1800/7 = 257mm 257.14 is Closest to 265 Best Going 2R + G Between 550 to 700 Midpoint = 625 625- 2 x 180 = 265

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Calculate Stair Constrained Flight with Half Space Landing Stair width 900mm Preferred Riser 170mm 3600/170 = 21.176 21 3600/21 = 171.429 223600/22 = 163.636 Use 171.429mm Best Going = 625 – 2R = 625 – 2 x 171.429 = 282.142 Length of 1 st Flight = 4050 – 900 = 3150 Divide by Best Going = 3150/282.142 = 11.16 113150/11 = 286.364 12-3150/12 = 262.500 Use 286.364

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Calculate Stair Constrained Flight with Half Space Landing Stair width 900mm Preferred Riser 170mm Rise 171.429mm Going 286.364

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Calculate Stair Constrained Flight with Quarter Turn Winders Stair width 900mm Preferred Riser 170mm 4100/170 = 24.118 24 4100/24 = 170.833 25 4100/24 = 164 Use Rise 170.833 Best Going 625 – 2R = BG 625 – 2 x 170.833 = 283.334 2650/ 283.334 = 9.353 92650/9 = 294.444 (USE) 102650/10 = 265 Rise 170.833 Going 268.75

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Calculate Stair Constrained Flight with Quarter Turn Winders Stair width 900mm Preferred Riser 170mm 4100/170 = 24.118 24 4100/24 = 170.833 25 4100/24 = 164 Use Rise 170.833 Best Going 625 – 2R = BG 625 – 2 x 170.833 = 283.334 2650/ 283.334 = 9.353 92650/9 = 294.444 (USE) 102650/10 = 265 Rise 170.833 Going 294.444

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Calculate Stair Constrained Flight with Half Space Landing Stair width 950mmPreferred Riser 170mm 3400/170 = 20 3400/20 = 170 Rise Best Going = 625 – 2R = 625 – 2 x 170 = 285 2400/285 = 8.421 8 2400/8 = 300 (15 Diff) 92400/9 = 266.667 (18.3 Diff) Rise 170 Going 300

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Calculate Stair Constrained Flight with Half Space Landing Stair width 950mmPreferred Riser 170mm 3400/170 = 20 3400/20 = 170 Rise Best Going = 625 – 2R = 625 – 2 x 170 = 285 2400/285 = 8.421 8 2400/8 = 300 (15 Diff) 92400/9 = 266.667 (18.3 Diff) Rise 170 Going 300 With all examples either answer will comply and you should consult with your client and/or Architect

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Determine Steel Square Mathematically 40mm Margin

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Determine Steel Square Mathematically

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Zoom In Stair Pitch = 29.54 ⁰

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Determine Steel Square Mathematically Margin Line Stair Pitch = 29.54 ⁰

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Determine Steel Square Mathematically This angle must be the same Stair Pitch = 29.54 ⁰

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Determine Steel Square Mathematically This angle must be the same Stair Pitch = 29.54 ⁰ Sin Ѳ = Adjacent / Hypotenuse = 40 ÷ X X = 40 ÷ Sin 29.54 X = 81.131

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Determine Steel Square Mathematically This angle must be the same Stair Pitch = 29.54 ⁰ Sin Ѳ = Adjacent / Hypotenuse = 40 ÷ X X = 40 ÷ Sin 29.54 X = 81.13

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Determine Steel Square Mathematically Set Out For Steel Square Going Going + Margin ÷ Sin Ѳ = 300 + 40 ÷ Sin 29.54⁰ = 381.13mm Ѳ

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Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ

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Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ This Angle must = 90 - 29.54

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Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ This Angle must = 90 - 29.54 This Angle must = 29.54⁰ Y = 40 ÷ Cos 29.54⁰ Y = 45.9763

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Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ This Angle must = 90 - 29.54 This Angle must = 29.54⁰ Y = 40 ÷ Cos 29.54⁰ Y = 45.9763

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Determine Steel Square Mathematically Set Out For Steel Square Rise Ѳ Rise + Margin ÷ Sin Ѳ = 170 + 40 ÷ Sin 29.54⁰ = 170 + 45.98 = 215.98

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