8-30 Section 808. Fencing
808.01. Description This work consists of providing and erecting, or moving existing, woven wire fence, temporary fence, protective fence, chain link fence, high-tensile wire fence, or pedestrian fencing of structures. 808.02. Materials Provide materials in accordance wit h the following sections : Sound Earth .......................................................................................... 205 Fencing Materials .................................................................................. 907 Structure Expansion Anchors and Bolts ................................................ 914 Concrete, Grade 3000 ........................................................................ 1004
A.Protective Fencing . Provide new or used material for temporary and protective fencing. Wood posts for protective fencing do not require preservative treatment.
B.Fence Fabric. Provide either zinc -coated steel or aluminum -coated steel fabric for chain link fence. Only use p olyvinyl chloride (PVC ) coated fence fabric if required by the contract .
C.Moving and Salvaging Fence . The Engineer may approve material salvaged from moved, temporary, or protective fencing for use as permanent fence provided it meets the requirements of section 907. Provide additional materials in accordance with section 907.
D.Polyvinyl Chloride . Meet the requirements in subsection 907.04 with the exception that the chain link fence and gates must be 48-inch thermal fused with a black , plasticized PVC coating.
1.Fabric . The vinyl -coated steel chain link fence must meet the requirements of ASTM F668 Class 2b . The core must be 0.148 inch in diameter . The mesh size must be 2 inches. The PVC coating must be black in accordance with ASTM F934 .
2.Framing . The framing m ust be hot -dipped galvanized prior to vinyl coating. The thickness of the vinyl coating must be 10 to 14 mils applied by fusion bonding. Provide a general certification that the materials provided meet the requirements stated above. The Department will conduct acceptance testing in accordance with subsection 907.02. MDOT Standard Specifications for Construction Section 808
8-31 808.03. Construction
Erect a taut fence to the line required by the contract . Dispose of surplus excavated material and other debris in accordance with subsection 205.03.P . The Engineer will designate and mark trees and other vegetation to be saved. Construct the fence near designated vegetation and in naturally occurring wet areas, by hand, as directed by the Engineer.
A.Concrete. Place concrete per section 1004.
B.Woven Wire Fence. Use wood posts in swamps and areas of uns table soil. If necessary to confine livestock, erect the permanent fence before removing the existing fence. If the permanent fence must be installed in the same location as the existing fence, install temporary fencing to be paid for as Fence, Temp at the contract unit price. Install fencing near schools, play areas, or residential yards prior to removing the existing fencing.
1.Clearing Fence Line . Where clearing for fence is required, clear the fence line in accordance with subsection 201.03.C.
2.Setting Po sts. Dig holes for wood posts in accordance with the MDOT Standard Plan R -101 series with a tolerance of 3 inches. Leave at least 4½ feet of the post exposed. Set the wood posts plumb on the side designated for fastening the wire. Set with the butt end down. Backfill around the post with sound earth, thoroughly compacted in place. Steel posts must be plumb. Remove and replace bent or damaged posts. When placing posts, maintain the tops of posts at a uniform height above the ground. After erecting the fence, cut off the tops of wood posts to the required elevation. Set an intersection post in line with intersecting fences and brace in line with the intersecting fence . Connect both intersecting fences to the intersection post.
3.Anchoring and Bracing Wood Pos ts. Anchor and brace wood posts, except intermediate line posts, in accordance with the MDOT Standard Plan R -101 series. If using cleats to anchor wood posts, use sawed lumber with durability equal to that of the posts . Secure timber braces to the post usi ng galvanized spikes . MDOT Standard Specifications for Construction Section 808
8-32 Install a cable compo sed of double strand, No. 9 galvanized wire, in
accordance with the MDOT Standard Plan R -101 series . Loop the cable around the end, corner, gate, angle, intersection, or intermediate braced post, and around the adjacent line post . Twist the cable until the top of the adjacent line post is drawn back 2 inches . Secure the cable to maintain tension.
4.Anchoring and Bracing Steel Posts . Anchor and brace steel posts in accordance with the MDOT Standard Plan R -101 series. Brace end and gate posts with one brace in the direction of strain. Brace corner, angle, and intermediate posts in both directions . Brace intersection posts in three directions . Fasten braces near the top of the post . At depressions and alignment angles where stresses are created that may pull the posts from the ground, set the line posts in concrete.
5.Installing Fabric and Barbed Wire . Wrap each horizontal strand of wire around the end, corner, gate, or intermediate braced post and wind around the wire leading up to the post. Stretch the wire fabric taut and fasten it to each post with the bottom of the fabric 2 inches above the ground. Use line posts as stretching anchorage only if they are anchored in concrete. Obtain the Engineer’s approval for the method of splicing wires in woven wire fabric and barbed wire. Make the distance between the vertical wire stays, next to the splice, equal to the unspliced sections of woven wire fabric . Splice a woven wire and barbed wire fence only if connecting two rolls of wire . Do not make intermediate splices. Fasten the fence fabric to each steel post with at least six wire clamps. Attach the fence to each wood post with at least one st aple for each horizontal strand. Use staples made of 9-gauge galvanized steel wire, at least 1½ inch long for soft wood or at least 1 inch for hard wood posts. Fasten the barbed wire to each post 3 to 4 inches above the fabric.
6.Installing Vinyl Coated Chai n Link Fence . Conduct the work according to section 808, the MDOT Standard Plan R -98 series for the gates, and the MDOT Special Detail 99 for the fence. Electronically submit one complete set of manufacturer’s specifications to the Engineer for approval a minimum of 14 work days prior to fabrication of the materials . Do not fabricate any materials prior to receiving approval from the Engineer. MDOT Standard Specifications for Construction Section 808
8-33 C. Tempora ry Fence. Erect temporary fence in accordance with subsection
808.03.A and subsection 808.03.B, except as modified by the following:
1.Setting Posts . Set line posts at least 2 feet into the ground and end posts at least 3 feet into the ground and do not trim the tops . The Engineer may allow the omission of intermediate braced posts.
2.Installing Fabric . Attach the fabric to wood posts with at least one staple for every third strand or to steel posts with at least four wire clamps.
3.Removing Temporary Fence . Remove and dispose of the temporary fence, or salvage in accordance with subsection 808.02.C.
D.Protective Fence. Place a protective fence around excavations for bridges and pump stations, and other areas of the project in accordance with subsection 104.07.B and the plans, or as directed by the Engineer . Erect protective fence in accordance with subsection 808.03.A and subsection 808.03.B, except as modified by the following:
1.Anchoring and Bracing Posts . Anchor an d brace enough posts to keep the fabric taut.
2.Maintaining Fence. Maintain the protective fence until the Engineer directs its removal or accepts the project.
3.Removing Protective Fence. Remove and dispose of the protective fence.
E.Chain Link Fence . Erect cha in link fence on steel posts set in concrete.
1.Clearing Fence Line . Clear the fence line in accordance with subsection 201.03.C .
2.Setting Posts . Set posts in concrete and brace. Install angle posts where the alignment of the fence deflects more than 10 degree s. Set an intersection post in line with intersecting fences . Connect both intersecting fences to the intersection post. Fit posts with Department -approved post caps.
3.Braces. Fasten braces to the end, corner, angle, intersection, gate, and intermediate br aced posts with required steel fasteners.
4.Installing Fabric and Top Tension Wire . Stretch chain link fence fabric taut and fasten to each post with Department -approved fasteners . Space the fasteners no greater than 12 inches apart on the posts . Fasten the fence fabric to the tension wire, at no greater than 15-inch intervals, using fasteners fabricated from 12-gauge galvanized MDOT Standard Specifications for Construction Section 808
8-34 wire. Close fasteners to the full crimp position around the tension wire
and fence fabric.
F.High -Tensile Wire Fence. Construct high-tensile wire fence in accordance with subsections 808.03.A and 808.03.B . Erect the wires in accordance with the manufacturer's recommendations.
G.Fencing on Structures . Construct fencing o n structures in accordance with subsection 808.03.E . Install a fully compressed lock washer on the bolt threads of exposed nuts . Construct handrails, as shown on the plans, as part of the fencing in accordance with section 707.
H.Moving Fence . Remove the exi sting fence without damaging the materials . Set posts and anchors in the same manner and to the same depth and spacing as the original fence. Place the reset fence in at least as good condition as the existing fence before it was moved . If the fence consis ts of wire fabric, draw it taut but do not overstress the salvaged materials . Replace damaged or destroyed materials at no additional cost to the Department. 808.04. Measurement and Payment Pay Item Pay Unit Fence, Temp .............................................................................................. Foot Fence, Protective ....................................................................................... Foot Fence, Woven Wire with Wood Post ......................................................... Foot Fence, Woven Wire with Steel Post ........................................................... Foot Barbed Wire ............................................................................................... Foot Fence Gate, __ foot, for Woven Wire ....................................................... Each Fence, Chain Link, __ inch ........................................................................ Foot Fence, Chain Link, __ inch, with (number) Strand of Barbed Wire ............ Foot Fence Gate, __ foot, for __ inch Chain Link Fence ................................... Each Fence, High Tensile Wire ........................................................................... Foot Fence, Structure ............................................................................ Square Foot Fence, Moving ........................................................................................... Foot Fence Post ............................................................................................... Each Fence Material ........................................................................................... Foot Fence, Chain Link, __ inch, Vinyl Coated .................................................. Foot Fence Gate, __ foot, for __ inch Chain Link Fence, Vinyl Coated ............ Each
A.Concrete Acceptance. Conduct concrete QC as specified in section 1002. The Engineer will conduct QA as specified in section 1003. The Department will pay for this work based on the QA results.
B.Fence. The Engineer will measure fence in place and will not include gate openings in the measurement for Fence, Temp; Fence, Woven Wire; MDOT Standard Specifications for Construction Section 808
8-35 Fence, Moving ; and Fence, Chain Link . The Engineer will measure
gates separate ly. The unit price for fence of the type required includes the cost of providing and installing posts, braces, fabric , and hardware. The Department will not make adjustments in price for handwork required to avoid damage to trees and vegetation designated to be saved. If required, the Engineer will measure, and the Department will pay for , barbed wire separately except that the unit price for Fence, Chain Link, __ inch, with (number) Strand of Barbed Wire includes barbed wire.
C.Temporary and Protective Fence. The Department will not pay separately for protective fence required in accordance with subsection 104.07.B. If the Engineer directs, or the plans show , the use of protective fence, the unit price for Fence, Protective includes the cost of providing and placing. The unit prices for Fence, Temp and Fence, Protective include the cost of providing, erecting, maintaining, removing, and disposing of fence. The Engineer will not deduct openings from measurements for Fence, Protective. The Engine er will not measure gates separately.
D.Fence, Structure. The unit price for Fence, Structure includes the cost of providing and installing posts, braces, and fabric, and all supporting, connecting, and auxiliary elements, including handrails if shown on the plans, for the erection of fences on existing or new structures.
E.Fence, Moving . The Engineer will measure Fence, Moving in place at its new location. The unit price for Fence, Moving includes the cost of disassembling, moving the fence, and installing it in its new location. The unit price also includes replacing posts or fabric damaged or destroyed by the Contractor’s removal operation. The Department will pay for new posts or new fence material, if shown on the plans or required by the Engineer, at the c ontract unit price for these items . If the contract does not include new post or new fence material pay items, the Department will pay for these as extra work.
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 591–596 of 1,146.