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STAIRS 3 rd YEAR TRADE Lesson Two M.S. MARTIN March 2005 Reviewed 2011 M.S. MARTIN March 2005 Reviewed 2011

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Review Calculations Determine suitable rise & going of step to construct a closed riser timber staircase given the following. Rise of flight – 2.400m Going of flight – 3.900m Assume rise of – 170mm No. Risers = 2.400.170 = 14.117 say 14 Height of Riser = 2.400 14 = 171.428 say 171 No. of Goings = 13 (one less) Length of going = 3.900 13 = 300 Check for easy going 2R + G = 550 to 700 (2 x 171) + 300 = 642 OK

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Revise Definitions Handout Complete names on handout & review on completion

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Types of Stairs Ref: Carp 18 Textbook – from P6

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Straight Open Riser

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Dogleg

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Quarter Turn

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Geometrical circular

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Spiral or Helical

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Types continued – from P5 - 9 Review text for type combination Brick Concrete Steel or Iron Other types Timber

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BCA Your 2011 workbook on stairs (first section) Your text and other printed information, makes frequent reference to BCA requirements, review some of these in the handout

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Timber Stairs Ref: Carp 18 textbook – P25 – 29

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Open Riser Stair From P27 Also your first practical exercise Review these few pages in your textbook

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Closed Riser Staircase Your 2011 workbook from P 36 Review Handout, this will be your second practical project

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Rise of step Margin line Closed Riser Stair Set - out

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Wedge Detail & Size Nosing line

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Tread Detail of Housings

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Closed Riser Staircase

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Template you made in the workshop

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Tenon Details Copy into your handout

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Newel set - out

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Newel set – out continued, also P23 carp 18

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Stair calculations including length of string Example P31 – carp,18

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Stair calculations Review example of calculations on P31 of your textbook

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Complete exercises Workbook from P 17

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“Extra” Calc’s exercise No. 1 Copy the following and complete Calculate the quantity of timber required for the open riser stair with following spec: –Rise of flight850mm –Going of flight1.100m –String material250mm x 38mm sawn H/W –Treads40mm thick sawn H/W –Width of stair1.200m –Assume rise160mm

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Answer – note: this symbol √ below means square root No. of Risers =.850.160 =5.312 say 5 risers Height of riser =.850= 170mm 5 No. of Goings = 4 Width of going =1.100 4 =275mm 2R + G =(2 x 170) + 275 + 615 OK Length of string √ (rise of flight)² + (going of flight + one going of step)² √.850² + (1.100 +.275)² √.850² + 1.375² √.723 + 1.891 √ 2.614 = 1.617 Order 1.8m lengths String 250 x 38 H/W 1 @ 3.6 Treads 275 x 40 H/W 1 @ 4.8 You don’t have to show all the working, but for this example it shows you the full answer

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Calc’s Exercise No. 2 Copy the following & complete Calculate the timber order for a closed riser flight of stairs to suit the following spec: –Rise of flight2.450m –Going of flightunrestricted try 280mm –Rise of step approximately 160mm –Riser boards19mm thick maple, 20mm nosing –Treads40mm maple –Stringer350 x 40mm Maple –Width of stairs2.600m

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Answer No. 2 No. of Risers =2.450.160 =15.310 say 15 risers Height of riser =2.450= 163mm 15 No. of Goings = 14 Width of going - unrestricted =280 =280mm 2R + G =(2 x 163) + 280 = 606 OK Length of string √ (rise of flight)² + (going of flight + one going of step)² √ 2.450² + (3.920 +.280)² √ 2.450² + 4.200² √ 6.003 + 17.640 √ 23.643 = 4.862 Order 5.1m lengths String 350 x 40 Maple 2 @ 5.1 Treads 300 x 40 Maple 7 @ 5.4

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