SCAFFOLDING INTERVIEW QUESTIONS & ANSWERS
*Scaffold ‐ A temporary elevated platform (supported or suspended) and its Supporting structure (including points of anchorage) used for supporting Employees, materials, or both.
*Scaffolding standard
IS Standard -3696
BS - 12810/12811
AS/NZS-1576
OSHA-29 CFR 1926- SUB-PART -L
Nasc guideline
*Which tools are used by scaffolders?
*How many types of scaffolding
As per OSHA supported /suspended/aerial lift
Tower scaffold/Mobile tower/independent/birdcage/cantilever/hanging
*Types of Scaffold couplers/Clamp & capacity
*Right angle coupler/Fixed Couplers Capacity -Class A-6.10KN/Class B-9.10KN
*Swivel Couplers capacity - Class A-6.10KN/Class B-9.10KN
*Single Coupler capacity -0.63KN
*External sleeve Coupler/Box Coupler Capacity - Class A-3.6KN/Class B-5.5KN
*Beam Coupler Capacity -Hold capacity (Pair)-30KN
*Ladder Clamp -NA
*BRC Clamp-NA
*Which standard code is used for the scaffold tube?
EN - 39/BSEN - 1139/IS -1161
*What is the Dia of Scaffold Tube/Pipe-
40 NB (Nominal bore)/ Outer Diameter - 48.3 mm
*What is the Wall Thickness of Scaffold Tube/Pipe
3.2 mm - High tensile Galvanized steel tube (EN-10219) 4.0 mm - Galvanized steel tube (EN -39)
*what is the Colour Code procedure for scaffold tube
Keep 300 mm distance from both sides of the scaffold tube and mark 4 inch (100mm) Colour code
*Which standard code is used for the scaffold board ?
Code- IS -2750/BS-2482
*What is the width and thickness of scaffold board?
Width -225, Thickness or height -38mm/50mm/63mm
*What is the Thickness of steel planks?
1.1mm to 2.0 mm
*What is the size of sole board?
450*220*36 mm
*What is the size of sole base plate
150*150*5mm thickness plate
* kicker lift & height from ground level?
150mm from ground level
*What is scaffold Lift & height of lift minimum and maximum?
Assembly of ledgers and transoms forming each horizontal level of a Scaffold. Height shall be Minimum 2.0mtr maximum 2.7mtr
*Explain node point of scaffold & node point distance
Node points shall not be more than 300mm.
*What is the height of the toe board, mid rail & top guard rail?
Toe board height-150mm -capacity 50 pounds-(22.67 kg )
Mid rail height from top of the toe board -470mm-capacity-100 pounds (45.40 kg)
Top Guard rail height from mid rail-470mm -capacity-200pounds (90.80 kg)
*Types of scaffold duty’s or scaffold load class
Very light duty -75 KG / m2 -Dimension of bay -2.7m
Light duty -150KG/ m2 -Dimension of bay -2.4m
General purpose duty-200kg/ m2- Dimension of bay -2.0m
Heavy Duty-300kg/ m2- Dimension of bay -1.8m
* The spacing of T dropper in hanging scaffold
2.5Mtr as per BS5973 Standard
*Types of ladders
Timber Ladders/ Metal ladders /Rope ladder
*What is the standard code of Aluminium Ladder?
BSEN-131/ BS2037
*How much distance of spacing acceptable between ladder rungs
300mm
*How much ladder extend required above the working platform
1.0mtr above the platform or minimum 3rungs
*Vertical 4.7 Mtr landing platform & 9.1 Mtr horizontal interval
*How much SWL of Industrial Aluminium Ladder
Tested-150kg
Transition period all -110kg
*What is the formula of scaffold SWL?
SWL=D (4×L)
*Explain Types of scaffold tags
Red-not safe for use/do not use
Yellow-scaffold under maintenance
Green tag-scaffold inspected and safe for use
*When scaffold inspection are necessary
*After Assembly or Modification
*Regular intervals inspection
*After adverse weather conditions
*After event impacting stability
*prior to handover or
*Routine inspection by competent persons
*Types of Scaffold ties Types of scaffold Tie's Duty/Scaffold Tie's Capacity
Racker Tie's
*LIP TIE’S
*Box Tie’s
*Reveal tie
*How many types of bracing
Faced brace
Ledgers brace
X brace or cross brace
Plan brace
Wing brace
*What is the common inspections points in scaffold materials?
Quality materials
Identification & marking
Weld & connection
Corrosion & rust
Dimensions & specification
Founding dent bend
*What is the design requirement for scaffold as per osha specification
All scaffolds over 125' in height must be designed by an Engineer
*What is the distance between the Gin wheel and outer post or platform?
*Working platform for men without material platform width - 500mm three planks
Working platform for men & material platform width -800mm 4 or 5 board
Explain WORK AT HEIGHT REGULATIONS 2005 Hierarchy of controls
• Avoid work at height
• Prevent falls
• Mitigate the distance and consequences of a fall
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