Commercial Roof Anchor Installation Instructions
Part# 48591 - Welded Steel Galvanized Anchorage Device
U-rod Cross Section: .625” Base: 16” x 16” Square
Base thickness: 3/8”
40 pcs #14 x 2.5” Type A Milled Point Deck Screws
Strength Rating: 5,000 lbs
Capacity: 310 lbs (Worker with Tools)
Optional Accessories:
48592 Commercial Anchor Flashing
48593 Commercial Riser Cap
WARNING: This product is part of a personal fall arrest system. The users must read and abide by the manufacturer’s instructions for each
element of the system. Installation of this roof anchor must be certified by a qualified person or engineering service. These
directions must be given to the users of this equipment. The users must read and understand these instructions or have them explained
to them before using this equipment. Manufacturer’s instructions must be followed for proper use, care and maintenance of this product.
Alterations or misuse of this product or failure to follow instructions, may result in serious injury or death
SPECIFICATIONS:
This fall arrest anchor is for single and multiple users on a low slope roof application (4/12 pitch or less). A Horizontal line fall restraint system
of up to four workers may be used if designed and inspected by a qualified person.
RECOMMENDED INSTALLATION:
Roof Anchors must be installed and spaced a maximum of 20ft. apart. Installation around the perimeter of the leading edge areas is
recommended to ensure compliance and allow the user to easily switch from anchor to anchor. Recommended spacing is between 6 and 10ft.
from edge of roof. Do not install the roof anchor on unsupported roof structures such as overhangs or inadequately secured decking.
1. ANCHORAGE: Select an anchorage point that is structurally secure and capable of supporting the required loads, see below installation suggestions.
2.CONSIDERATIONS: Personal fall arrest systems must be rigged to limit any free fall to a maximum of 6 ft. Avoid working above your
anchorage level since an increased free fall distance will result. Avoid working where your line may cross or tangle with that of another
worker or another object. Do not allow the lifeline to pass under arms or between legs. Never clamp, knot or otherwise prevent the lifeline
from retracting or being taut, avoid slack line.
3. FALL DISTANCE: Should a fall occur, there must be sufficient clearance in the fall area to arrest the fall before striking the ground or other
object. The total fall distance is the distance measured from the onset of a fall to the point where the fall is arrested. A number of factors can
influence the total fall distance including; user’s weight, anchorage location relative to the fall (swing fall), body support with sliding D-ring,
and the type of fall arrest equipment you attach to the roof anchor. For specific clearance requirements read and follow the manufacturers’s
instructions for your fall arrest equipment.
4. SWING FALLS: Swing falls occur when the anchorage point is not directly above the point where a fall occurs. The force of striking an
object while swinging (horizontal speed of the user due to the pendulum affect) can be great and may cause serious injury. Swing falls can be
minimized by working as directly below the anchorage point as possible. In a swing fall situation, the total vertical fall distance of the user will
be greater than if the user had fallen vertically directly below the anchorage point. The user must therefore account for an increase in the total
free fall distance and the area needed to safely arrest the fall. A commonly followed guideline is not to extend your work zone over 30° from
the anchorage point.
5. SHARP EDGES: Avoid working where the connecting subsystem or other system components will be in contact with, or abrade against
unprotected sharp edges. If working with this equipment near sharp edges is unavoidable, protection against cutting must be provided by
using a heavy pad or other means over the exposed sharp edge. Compatibility and total fall distance issues must be considered if this is done.
Instruction Sheet #08116
030209,E1054
TIE DOWN ENGINEERING • 255 Villanova Drive SW • Atlanta, GA 30336
www.tiedown.com (404) 344-0000 Fax (404) 349-0401
6. RESCUE: The user (employer) must have a rescue plan, rehearse that rescue
plan with employees, and continually have the means at hand to implement it. All
personnel must be prepared should a fall occur.
7. AFTER A FALL: Any equipment which has been subjected to impact loading
must be removed immediately from service and shall not be used again for
employee protection until inspected and determined by a qualified person to be
undamaged and suitable for reuse.
PRIOR TO EACH USE: Fig. 1
Personal fall arrest systems and components shall be inspected prior to each
use for wear, damage, and other deterioration. Defective components must be
removed from service. Personal fall arrest systems shall not be attached to
guardrail systems or hoists.
HORIZONTAL LIFELINES:
Horizontal lifelines shall be designed, installed, and used under the supervision #14 x 2-1/2
of a qualified person as part of a complete personal fall restraint system. Hex Head Screws
#14 x 2-1/2 #14 x 2-1/2
INSTALLATION OF THE ROOF ANCHOR Fig. 2
Hex Head Screws 2nd 24”x24”Hex Head Screws
The roof structure coupled with the fastening of the roof anchor to the roof structure
must meet the minimum strength of 5,000 lbs. A professional engineer or other Deck Sheet
such qualified person must certify that the anchorage meets this requirement.
24”
A. WOOD DECKING 24”
3/4” Backer Board
3/4” Backer Board
The anchor must #14 be installed
x 2-1/2 in the center #14 xof a plywood sheet that is 48”x 48”
2-1/2
and is secured to at
Hexleast
Head3 top trusses seeHex
Screws fig.Head
1. Screws
Minimum thickness
2nd 24”x24” 2ndof plywood
24”x24”
decking is 1/2” with 3/4”” backer, see Single fig. 2. The 20
Deck ga.
Sheet
deck min.Deck Sheet
sheathing must be Less than 20 ga.
secured at all perimeter edges, 8” on center using deck screws. Secure a sheet #14 x 2-1/2
Deck Sheet
of 3/4” x 48” plywood reinforcement board as shown in fig. 1 & 2, cut to fit
Deck Sheet #14Hex
x 2-1/2
Head Screws
Hex Head Screws Fig. 3
between the inside width of the20
Single truss spacing. AttachLess
ga. min. thethan
reinforcement
20 ga. board to
Single 20 ga. min. Deck Sheet
Less than 20 ga. Deck Sheet
the deck sheathing using the same 8” on center and screws. Anchor Fastening
Deck Sheet
Specification: Attach the anchor usingDeck Sheet
at least 40 -2.5”x #14 hex head screws.
The fasteners must penetrate through the reinforcement board. A visual inspection 16” 16”
should be taken to verify that the fasteners are installed through the board. For 3/4” Backer Board
trusses with 24” spacing, center 1/2” the Wedge
anchor as shown in fig. 2. For trusses less 16” 16”
Anchors
than 24”, two reinforcement boards must be used and theWedge
1/2” anchor centered over 3/4” Backer Board
1/2”shown
the truss as Wedgein fig. 3. Additional screws for reinforcing decking not supplied Fig. 4 Fig. 5
Anchors Anchors
by Tie Down Engineering. All anchorage methods must be inspected and certified
#14x x2-1/2
#14 2-1/2
by a professional engineer or qualified person. Hex Head Screws
Hex Head Screws 2nd24”x24”
2nd 24”x24”
B. CORRUGATED STEEL ROOF DECKING Deck Sheet
Deck Sheet
The roof structure with steel decking that the roof anchor is to be installed onto
must meet the minimum strength of 5,000 lbs. A professional engineer or qualified
person must certify that the anchorage meets this requirement. The steel decking
material must be a minimum of 20 gauge. Additional structural members may be Single20
Single 20ga.
ga.min.
min. Lessthan
Less than20
20ga.
ga.
Deck Sheet Deck Sheet
needed to allow the anchor to be securely attached to the primary roof structure. Deck Sheet Deck Sheet
Align the anchor base plate fastener holes over the raised channel of the steel
decking as shown in fig. 4. Attach the anchor to the metal deck using 40 #14 x
2.5” self tapping hex head screws. Do not over tighten fasteners. Steel Decking
less than 20 gauge: Attach a second layer of metal decking 36” x 36” (915 x
915mm) as shown in fig. 5, over the primary metal decking. Attach the second 1/2”Wedge
1/2” Wedge
Anchors
Anchors
layer to the primary using #14 deck screws, 8” (204mm) on center through all Fig. 6
raised channels of the metal decking.
C. Concrete
The concrete that the roof anchor is to be installed onto must have a minimum
thickness of 4” and be rated at 2,000 psi. min. Use 8 - 1/2” wedge anchors (not
supplied) rated at 6,000 lbs, to attach and align as shown in fig. 6. The concrete
must be fully cured to withstand the required 5,000 lb. load before using.
TIE DOWN ENGINEERING • 255 Villanova Drive SW • Atlanta, GA 30336
www.tiedown.com (404) 344-0000 Fax (404) 349-0401
