This document provides information on scaffolding safety at construction sites. It defines scaffolding and describes the three main types: supported, suspended, and other scaffolds. Supported scaffolds are platforms supported by poles, legs, frames, and outriggers. Suspended scaffolds are platforms suspended by ropes or overhead support. The document outlines general objectives, hazards, and safety requirements for scaffolds. It provides details on inspection of scaffolding components and good and bad safety practices. The overall goal is to educate personnel on scaffolding safety to prevent accidents and injuries at construction sites.

1. Scaffolding Safety at
Construction Site
Prepared By
Engr. Ali Kamal Mostofa Rubel (Electrical)
MPH in Occupational Health & Safety
alikamalmostofa@gmail.com
+8801682560119
+8801 911522533

2. General Objectives of this Presentation
 The over all objectives of this Presentation to give
personnel concerned with scaffolding safety & the
safety requirements for scaffolds generally and in
particular independent and special scaffold used in the
construction and Maintenance of installations.

3. Definition of Scaffolding
Definition:
A scaffold is any temporary, elevated work
platform and its supporting structure used
for holding people, materials, or both.
Scaffolding is used in new construction,
renovation, maintenance and repairs.
OSHA categorizes scaffolds into three
basic types:
1.Supported scaffolds
2.Suspended scaffolds
3.Other scaffolds

4. 1. Supported scaffolds:
Platforms supported
by rigid, load bearing
members, such as
poles, legs, frames,
& outriggers

5. 2. Suspended scaffolds:
Platforms suspended by
ropes or other non-rigid,
overhead support

6. Light Duty
• Not to exceed 25 pounds per
square foot
• 10 foot longitudinal post
spacing
• 6 foot traverse post space
1. work level
• 8 additional planked levels
• 125 feet maximum height
2. work levels
• 4 additional planked levels
• 125 feet maximum height
3. work levels
• 0 additional planked levels
• 91 feet maximum height
Medium Duty
• Not to exceed 50 pounds
per square foot
• 8 foot longitudinal post
spacing
• 6 foot traverse post space
1. work level
• 6 additional planked
levels
• 125 feet maximum height
2. work levels
• 0 additional planked
levels
• 78 feet maximum height
Heavy Duty
• Not to exceed 75
pounds per square
foot
• 6’ 6” foot longitudinal
post spacing
• 6 foot traverse post
spacing
1. work level
– 6 additional
planked levels
– 125 feet maximum
height
The design load of all scaffolds

7. Introduction of Scaffolding
It should be understood that scaffolding is an extremely important
precise structure in which intelligence will never fail.
A lot of this misuse could be avoided by stricter supervision on
site.
Safety should be every one’s business from management down to
workers.
Accidents not only cause injury and pain, they can also kill.
And there is always the loss of productivity to be considered.
The accident involving scaffolding are not always due to faulty
construction but also misuse and by being tampered with
inexperienced people.

8. Hazards In Scaffolding
The major faults that arise are the following:
Removing boards from working platforms
Taking braces out at the platform levels.
Removing handrails and toe boards.
Taking ladders away from their original locations.
Failing to stack materials properly.
• Employees working on scaffolds are exposed to these hazards:
• Falls from elevation
• Struck by falling tools /debris
• Electrocution
• Scaffold collapse
• Planking failure

9. Safety In Scaffolding
 Be Wise
 Be Safe And Never Sorry
 Ignorance Is No Moral Defence
 Do Not Stand:
• On Ties,
• Guardrails,
• Or Extensions
 Do Not Overreach Outside The Guardrails
 Stay Off Scaffold During Loading Or Unloading
 Replace Guardrails After Loading Or Unloading
 Use 3-point Climbing
 Don’t Hang Tarps Without Evaluation
 Exit Mobile Scaffolds Before Moved
• Always Wear Fall Protection To Avoid Accidents

10. Scaffolding General requirements
1. Footing or Anchorage
 The footing or anchorage is to be on a
solid foundation; sound, rigid, and
capable of carrying the maximum
intended load without settling or
displacement.
 The use of unstable objects to support
planks or scaffolds is prohibited.

11. Scaffolding General requirements Cont…
2. Guardrails
 The use of guardrails is very important,
preventing workers from falling. Nearly
3/4 of the reported scaffold accidents are
caused by improper guarding.
 Open-ended or open-sided platforms must
have standard guardrails and toe boards.
 The guardrails are to be 2 X 4 and about
42” high with a mid rail whenever needed.
The supports for the guardrails are to be at
intervals no more than 8 feet.

12. Scaffolding General requirements Cont…
3. Safe Access
• Must have safe access
• Cross-braces prohibited as means of access
• Bottom rung no more than 24’ high
• Rest platforms required at 35’ intervals
• Slip-resistant treads on all steps and landings
• Hook-on attachable ladders
Specifically designed for type of scaffold
Lowest rung no more than 24 inches above level
on which scaffold is supported
Rest platforms at 35 foot intervals when more
than 35 feet high
Minimum rung length 11 ½ inches, and a
maximum space between rungs 16 ¾ inches

13. Ladder and Access Platforms
Ladders
Foundation must be firm and
level
Angle of about 75 degree
4 vertical to 1 horizontal
Projecting at least 1.05 meter

14. 4. Protective Screening
 Overhead protection shall be provided
for men on scaffolds and, in the same
sense, a screen is to be placed below the
scaffold where persons may in danger of
falling objects.
Scaffolding General requirements Cont…

15. Scaffolding General requirements Cont…
5. Safe Platforms
 The planking is to be of
Scaffold Grade wood or metal,
free of defects that may
contribute to an accident.
 The planking shall be
overlapping or secured from
movement, extending not less
than 6 nor more than 12”
over their end supports

16. Scaffolding General requirements Cont…
 vertical members standing perpendicular to
horizon
 Fully planked or decked with gaps no greater
than 1 inch
 Able to support its weight and 4 times the
maximum load
 At least 18 inches wide
 Scaffold should design by temporary structurer
1 inch Gap Max

17. Planks not properly overlapped
• No paint on wood platforms
• Use scaffold grade wood
• Fully planked between front upright and
guardrail support
• Component pieces used must match and
be of the same type
• Erect on stable and level ground
• It should be nailed properly, otherwise it
maybe toppled.
Scaffolding General requirements Cont…

18. Platform Ends
No Cleats
 Each end of a platform, unless
cleated or otherwise restrained
by hooks, must extend over its
support by at least 6 inches
 Side and end brackets are
designed to support people
ONLY.
 Do not overload platforms with
materials.

19. Scaffold Height
5’
20’
 The height of the scaffold
should not be more than
four times its minimum
base dimension unless
guys, ties, or braces are
used.
 With a width of 5’, this
scaffold cannot be higher
than 20’.

20. Supported Scaffolds
• Platforms supported by legs,
outrigger beams, brackets,
poles, uprights, posts, &
frames.
• Restrain from tipping by
guys, ties, or braces.
• Scaffold poles, legs, posts,
frames, and uprights must
be on base plates and mud
sills or other firm
foundation
Base plate
Mud sills
Good support Not so good support
Unacceptable support foundation.

21. Different Parts of a Scaffold

22. Different Parts of a Scaffold

23. Common Faults

24. Defective Tubes

25. What to look for when inspecting boards ?
Free from dangerous
knots.
Banded both ends
Free from burns, cuts,
nails, checks, oil, or
splits.
Not warped.
Be of normal weight.
Free from natural
flaws such as cross
grain.

26. Foundations Cont…

27. Guard-Rails
42”/1067mm
21”/533mm
4” min

28. Scaffolder’s Personal Protective Equipment
Full Body Harness with Double Lanyard
 Used as fall arrest during erection and dismantling of
scaffolding.
 Full body harness and lanyard should be inspected
before use. It must be replaced when it must be
replaced when involved in a fall.
 Ensure that always one lanyard is connected at all
times when moving.
Knitted / Rubberized Hand Gloves
 Used to Protect hands during
handling of scaffold materials.
 Used to increase grip on scaffold
materials to avoid slippage.

29. Full-Body Harness
 Use full body harness with twin lanyard while erection.

30. Scaffolding Tools and Other Accessories
Magnetic Scaffold Level
 Magnetic level shall be used
for leveling scaffold pipes
that are installed vertically
and horizontally.
Ratchet / Combination Wrench
 Ratchet / Combination Wrench Shall
be used in tightening of couplers.
Ratcheting can be reversed by flipping
over the wrench can be reversed by
flipping over the wrench or by
activating the reversing lever on the
wrench.

31. Scaffold Tag
When the Scafftag is RED : the scaffold is
under construction; and it has not been
inspected and is not approved for use.
No person cannot use this scaffold for
working while this symbol is shown.
Only authorized scaffolder use this
scaffolder for the reason for erection.
RED TAG

32. Scaffold Tag
A green "SAFE FOR USE"
tag(s), and should be attached
to the scaffold at each access
point after the initial
inspection is complete.

33. Scaffold Tag
 All scaffolds must be checked once a
week.
 Special precaution to be taken when
people working on the yellow scafftag
follow the project procedures.

34. Status: Lack of mean of
access, No Platform edge
protection
Overhead obstructions
Recommendation: Regular
inspection, Safe working
load, Competent staff,
Safety equipment working,
Platform edge protection,
Guard rails and toe boards
fitted, Adverse weather
rules, Protected electricity
supplies, Communication
emergency procedures
Bad Practice

35. Red Tag
Status:
Using unsafe
scaffolding with
red tag.
Recommendation:
Implement work
permit system
and erect
scaffolding with
certified scaffold
supervisor
Bad Practice Cont…

36. Status: No base plate, No Platform
edge protection, No stair for access. Status: No base plate, No Platform
edge protection, No stair for access.
Bad Practice Cont…

37. Bad Practice Cont…
Status: No base plate. This type of
practice may unbalance topple and
cause of fatal accident.
Status: No base plate. No mean of
access. This type of practice may
unbalance & topple hazard and cause
of fatal accident.

38. Bad Practice Cont…
Status: Broken Base plate. Not fit for
carrying weight may unbalance and
topple.
Status: Lack of mean of access, No
Platform edge protection.

39. Handrails installed
Secured to structure
Knee rails installed
Kick/Toe Boards in
place
Trap Doors Installed
Handrails installedWorking platform
complete
Ladder or steps
installed
Scaffold permit
signed
Green Tag Displayed
Foot plates installed
Cross Bracing in
Place

40. Good Practice

41. Good Practice Cont…

42. Good Practice Cont…

43. Good Practice Cont…

44. Any Question ?

45. We Should Not Learn From Accident