9-52 Section 907. Fencing Materials
907.01 General Requirements
Materials for fencing property, right -of-way, and other installations must meet the requirements of this section.
907.02 Testing
Fencing materials testing will be in accordance with the specified ASTM, AASHTO , or Department methods, as modified by this section. The weights of fencing material include the weight of coating unless otherwise specified. Zinc coating at 1 ounce per square foot corresponds to a coating thickness of 1.7 mils.
907.03 Woven Wire Fence
A.Fabric . Steel woven wire fabric must be zinc or aluminum coated.
1.Zinc Coated . Zinc-coated fabric must meet the requirements of ASTM A116, Design No. 1047-6 -11, for Grade 60, Class 1 zinc coating.
2.Aluminum Coated . Aluminum -coated fabric must meet the requirements of ASTM A116 , Design No. 1047-6 -11.
B.Barbed Wire . Standard grade zinc - or aluminum -coated steel barbed wire must be composed of two strands of wire with four -point round barbs . Provide chain-link -fence-grade barbed wire for use with chain link fence.
1.Zinc Coated . Zinc-coated barbed wire must meet the requirements of ASTM A121 and the following:
a.If the direction of the strand wire twist alternates between left and right, the strand wires must not untwist under a tensile force of 950 pounds for 12½ -gauge wire, 850 pounds for 13½ -gauge wire, or 750 pounds for 15½ -gauge wire; and
b.Class 1 zinc coating is required for 12½ -gauge steel wire, and Class 3 zinc coating is required for 13½ -gauge wire and 15½-gauge wire.
2.Aluminum Coated . Aluminum -coated barbed wire must meet the requirements of ASTM A121 for standard grade aluminum -coated steel barbed wire with aluminum -coated barbs.
C.Smooth Line Wire . Smooth line wire must be No. 9 gauge coated steel wire meeting the requirements of ASTM A116, for Grade 60, Class 1 MDOT Standard Specifications for Construction Section 907 9-53 zinc-coated smooth line wire or ASTM A116 for aluminum -coated smooth line wire.
D.Steel Posts . After fabrication, galvanize steel fence posts, braces, and fittings in accordance with ASTM A123/A123M and this subsection. The weight of zinc coating per square foot of surface on posts and braces must average at least 2.00 ounces , and no individual specimen may have less than 1.80 ounces of zinc coating per square foot r egardless of metal thickness . The Department will include the weight of zinc coating in the weights specified for posts and braces but will deduct the weight of galvanizing greater than 4.00 ounces per square foot of surface from the post weight. An alternat ive zinc and clear coat system for pipe sections is allowed. The exterior surface of the pipe section must have 0.90 ounce per square foot of zinc coating and a clear acrylic coating at least 0.30 mil thick . The interior surface of the pipe section must have 0.35 ounce per square foot of zinc coating or 0.30 mil zinc rich organic coating and a zinc powder loading of at least 91% by weight. Zinc coating must be applied in accordance with ASTM A123/A123M . Determine coating weights and thicknesses in accordance with AASHTO M181.
1.Line Posts . Steel for line posts must meet the requirements of ASTM A702 for Type A or Type B . Line posts must be 7 feet long, ±1 inch, with a nominal weight of 1.12 pounds per foot . Exclusive of the anchor plate, individual lin e posts must weigh 1.08 pounds per foot . Posts must be notched, studded, or have other Department -approved means of holding the fabric in place on the post . Provide each post with a Department -approved anchor plate and at least seven 11-gauge galvanized or aluminum -coated wire clamps.
2.End, Corner, Gate, Intersection, and Intermediate Braced Posts. Steel angle sections, steel pipe, or steel tubing end, corner, gate, intersection, and intermediate braced posts must have an average weight within 10% of the specified weight per foot . Angle sections for posts and braces must meet the physical requirements of ASTM A36/A36M or ASTM A702 for Type A or Type B. Provide the required fittings and braces with each post.
a.Posts . End, corner, gate, intersection, and intermediate braced posts must be 8 feet long, ±1 inch. MDOT Standard Specifications for Construction Section 907 9-54 Angle sections must be nominal 2½ inch by 2½ inch by ¼ inch. Pipe or tubing must be nominal 2 inch (2.375 inch OD) weighing 3.650 pounds per foot.
b.Braces. Angle section braces must be nominal 1¾ inch by 1¾ inch by ¼ inch or nominal 2 inch by 2 inch by 3/16 inch. Steel pipe braces must be nominal 1½ inch (1.900 inch OD) weighing 2.72 pounds per foot . Steel tubing braces must be nominal 1.750 inch OD weighing 3.13 pounds per foot. Braces must be long enough to support the posts.
E.Wood Posts . Wood posts must meet the requirements of subsection 912.0 7.
F.Gates. Provide gates for woven wire fence of the width and height shown on the plans . Provide each gate with Department -approved hinges, latches , and auxiliary braces to prevent sagging. Weld or fit to form a rigid and watertight frame. Use woven wire in accordance with subsection
907.03 A to fill gate frames.
907.04 Steel Chain Link Fence
A.Fabric . Chain link fence fabric must be zinc -coated steel fabric meeting the requirements of ASTM A392 for Class 2 coating, alum inum -coated steel fabric , meeting the requirements of ASTM A491 or polymer -coated steel fabric meeting the requirements of ASTM F668 as modified by this subsection. Galvanize zinc -coated fabric after weaving. Polymer-coated steel chain link fence fabric must meet ASTM F668, Class 2a , except that the steel core wire may be either hot -dip zinc coated (galvanized) or aluminum coated (aluminized) prior to polymer coating. Both the metallic coating and the polymer coating must be applied before weaving. The mini mum weight of metallic coating must conform to ASTM F668, Class 2a , for zinc galvanized or ASTM A817 for aluminum . Provide fabric height and polymer coating color as shown on the plans. Provide steel chain link fence fabric with the following characteristi cs:
1.Mesh size of 2.0 inches or as shown on the plans;
2.Wire size of 9-gauge zinc coated, 9-gauge aluminum coated, or 10-gauge aluminum coated; and
3.Top and bottom selvages knuckled. MDOT Standard Specifications for Construction Section 907 9-55 B. Tension Wire . Tension wire must meet the steel wire requirements of ASTM A824 for Type I aluminum coating and Type II, Class 3, zinc coating. As an alternative to tension wire coatings, the Contractor may use hot -dip Type I aluminized or hot -dip Type II, Class 1 galvanized, followed by a polymer coating. The polymer coating mus t meet the requirements for polymer -coated steel chain link fence fabric and match the color of the polymer -coated steel chain link fence fabric.
C.Posts for Fence and Gates. Fence posts and gate posts for chain link fence must be metallic -coated steel meeti ng the requirements of Table 907-1 and Table 907-2. Table 907- 1: Posts and Rail for Steel Chain Link Fence Use Fabric Height (inch) Diameter(a) (inch) Nominal Weight (lb/ft) ASTM Steel Specification(b) End, corner, angle, and intermediate braced posts(c) ≤120 2½ (2.875) 5.80 F1083 2½ (2.875) 4.64 F1043 3½ by 3½ RF c orner(d) 5.10 F1043 Line posts ≤120 2 (2.375) 3.65 F1083 2 (2.375) 3.12 F1043 1⅞ by 1⅝ H-section 2.72 F1043 2¼ by 145/64 H-section 3.26 F1043 2¼ by 1⅝ C-section(c) 2.70 F1043 ≤72 2 (2.375) 2.31 F1043 1⅞ by 1⅝ C-section(c) 2.26 F1043 ≤60 1½ (1.900) 2.72 F1083 2.28 F1043 Horizontal rail — 1¼ (1.660) 2.27 F1083 1¼ (1.660) 1.84 F1043
a.Outside pipe diameter with nominal diameter given first; actual diameter in parentheses .
b.ASTM F1083 references are for standard weight (Schedule 40) pipe.
c.Posts for fencing on structures must be 2½ inch (2.875 inch) nominal outside pipe diameter an d must meet the requirements of ASTM F1083 (Schedule 40) or ASTM F1043 (Group 1C) or as called for on the plans.
d.RF: roll-formed sections MDOT Standard Specifications for Construction Section 907 9-56 Table 907- 2: Pipe for Gate Posts and Frames Use Gate Width (feet) Diameter(a) (inch) Nominal Weight (lb/ft) ASTM Steel Specification(b) Gate posts ≤6 2½ (2.875) 5.80 F1083 2½ (2.875) 4.64 F1043 7–13 3½ (4.000) 9.11 F1083 3½ (4.000) 7.65 F1043 14–18 6 (6.625) 18.97 F1083 Gate frames ≤6 1¼ (1.660) 2.27 F1083 1¼ (1.660) 1.40 F1043 7–18 1½ (1.900) 2.72 F1083 1½ (1.900) 2.28 F1043
a.Outside pipe diameter with nominal diameter given first; actual diameter in parenthes es.
b.ASTM F1083 references are for standard weight (Schedule 40) pipe. The average weight per foot of metallic -coated fence posts must be within 10% of the required weight per foot . Posts must be at least 32 inches longer than the height of the fence fabric. Steel posts for chain link fence must be coated with zinc or aluminum inside and outside or polymer -coated posts in accordance with one of the following methods :
1.Zinc Coating . Apply zinc coating meeting the requirements of ASTM A123/A123M or ASTM A653 /A653M . Use the alternat ive zinc and clear coat system described in subsection 907.03.D for pipe sections only. The weight of zinc coating on pipe sections must average at least 1.80 ounces per square foot of surface and at least 1.60 ounces per square foot of surface per specimen when tested in accordance with ASTM A90/A90M . For posts, other than pipe sections, the weight of zinc coating on each post must average at least 2.00 ounces per square foot of surface and at least 1.80 ounces per square foot of surface per specimen when tested in accordance with ASTM A90/A90M .
2.Aluminum Coating . Use Type 2 alumi num to coat posts . The weight of aluminum coating on each post must average at least 0.75 ounces per square foot of surface and at least 0.70 ounces per square foot of surface per specimen when tested in accordance with ASTM A428/A428M . MDOT Standard Specifications for Construction Section 907 9-57 3. Polymer Coating . After metallic coating, coat exterior surfaces with extruded and adhered polymer coating. Match the color of the post to the color of the polymer -coated steel chain link fence fabric coating.
D.Gates. Provide gates for chain link fence as shown on the plans . Provide metallic -coated steel pipe gate frames in accordance with Table 907-2 . The average weight per foot of the pipe for the gate frames must be within 10% of the required weight per foot . Use the same type and weight of coating required for posts. Weld or fasten joints to form a rigid and watertight frame. Wire brush welded joints and paint with two coats of a Department -approved zinc -rich paint. Provide gates with intermediate braces and truss rods to prevent sagging, and provide Department -approved hinges, latches, keepers, and stops . Fill the gate frames with fabric meeting the same requirements as for the fence fabric. Provide polymer -coated gate frames the same as for metallic -coated gate frames in accordance with Table 907-2 . Apply polymer coating to gate frames including hinges, latches, keepers, and stops . Match the color of the polymer -coated gate frame to the color of polymer -coated steel chain link fence fabric.
E.Fence Fittings and Hardware. Provide post caps, rail, or brace ends ; tie wires and cl ips; tension and brace bands ; tension bars ; truss rods; barb arms; and other hardware meeting the requirements of ASTM F626 and the exceptions and additions specified in this subsection. Bevel the ends of hog rings for fastening fabric to the tension wire to allow crimping. Provide fittings made of malleable iron or pressed steel for fences and gates. If using aluminum -coated wire ties and clips, ensure that the coating weighs at least 0.30 ounces per square foot of surface. The Contractor may use flat aluminum alloy line post bands with an OD from 0.062 to 0.375 inch and with self -locking ends to fasten fabric to posts with an OD no greater than 2.375 inches. Use double twisted, No. 9 gauge, galvanized steel for fabric fasteners for structure f encing. Polymer-coated fence fittings and hardware must be as specified above. After metallic coating, coat exterior surf aces with extruded and adhered MDOT Standard Specifications for Construction Section 907 9-58 polymer coating. Ensure that the color of the polymer coating matches the color of the polymer -coated st eel chain link fence fabric.
907.05 High -Tensile Wire Fence
A.Wire . High tensile wire must be 1½ gauge, Grade 200, with Class 3 zinc coating in accordance with ASTM A854/A854M .
B.Wood Posts . Wood posts must be pressure treated and meet the requirements of subsection 912.07 .
C.Hardware. Galvanize hardware in accordance with ASTM A153/A153M .
907.06 Protective Fencing
Protective fencing must be orange, high-density polyethylene (HDPE) mesh fabric with a nominal 2-inch diamond design. Protective fencing must be 48 inches high and weigh at least 0.102 pound per square foot.
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Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 862–868 of 1,146. View official source ↗