Description

4′ x 8′ Steel Road Plate

The Iron Lot 4′ x 8′ Steel Road Plate provides temporary coverage for utility trenches, pavement cuts, access openings, and excavation work in streets, parking areas, driveways, and construction sites.

Its 4-foot width and 8-foot length make it a versatile road-plate size for underground utility contractors, municipalities, public works departments, and excavation crews. It provides more longitudinal coverage than a square plate while remaining easier to transport and position than larger road-plate configurations.

This road plate is available in 1-inch and 1¼-inch thicknesses. The applicable tabulated data is based on HS20-44 traffic loading and minimum ASTM A36 steel with a 36 ksi yield strength.

Plate selection must account for more than the outside dimensions. The clear opening, required edge overlap, supporting surfaces, plate thickness, traffic conditions, anchorage, and transition-ramp requirements must all be evaluated before installation.

Key Benefits & Crew Efficiency

• Versatile 4′ x 8′ Size: Provides temporary coverage for compatible utility trenches, pavement openings, and excavation work.

• Two Thickness Options: Available in 1-inch and 1¼-inch steel for different span and handling requirements.

• HS20-44 Design Basis: Covered by Iron Lot tabulated data for HS20-44 traffic loading when all specified conditions are satisfied.

• ASTM A36 Steel: Manufactured from minimum ASTM A36 steel with a specified yield strength of 36 ksi.

• Published Plate Weights: Weighs approximately 1,307 lbs at 1 inch thick or 1,633 lbs at 1¼ inches thick.

• Reusable Temporary Coverage: Suitable for contractors and municipalities that regularly cover utility cuts and excavation openings.

• Practical Transportation Size: Offers useful trench coverage without the weight and handling demands of larger road plates.

Product Specifications

Pricing & Logistics

Contact Iron Lot for Current Pricing and Availability

Contact us to confirm current pricing, available thicknesses, quantities, fabrication options, freight rates, and estimated delivery timing.

Freight & Delivery Coordination

Shipping requirements depend on plate thickness, quantity, total order weight, delivery location, and unloading arrangements.

Approximate plate weights are:

• 1-inch plate: 1,307 lbs;

• 1¼-inch plate: 1,633 lbs.

The trailer, lifting equipment, rigging, and unloading method must be rated for the selected plate and planned handling procedure.

We can coordinate delivery to your contractor yard, municipal facility, equipment location, or jobsite and provide quotes for multiple road plates or mixed-equipment orders.

Target Applications

The 4′ x 8′ steel road plate is intended for temporary coverage of compatible openings where the required bearing area, edge overlap, support conditions, and traffic requirements can be maintained.

Potential applications include:

• water and sewer utility cuts;

• gas, electrical, and telecommunications trenches;

• service-line excavations;

• localized pavement repairs;

• valve and utility-access openings;

• municipal and public works projects;

• parking-lot and driveway openings;

• temporary roadway coverage;

• contractor-yard and construction-site openings;

• utility repair and replacement work.

The 8-foot length provides coverage along the excavation while the 4-foot dimension may be positioned across a narrow trench where the required overlap can be maintained.

Actual suitability depends on the dimensions and orientation of the opening, the plate thickness, the supporting surface, and the traffic conditions. The plate should not be selected solely because the excavation appears smaller than its exterior dimensions.

Critical Selection & Installation Factors

Is a 4×8 Road Plate Right for Your Opening?

Road-plate selection requires more than comparing the plate size with the excavation dimensions.

The correct plate depends on:

• clear trench or opening dimensions;

• direction in which the plate will span;

• required edge overlap;

• plate thickness;

• traffic type and speed;

• supporting-surface condition;

• pavement or soil stability;

• vehicle loading;

• slope;

• anchorage requirements;

• transition-ramp requirements;

• available lifting and placement equipment.

The tabulated maximum span is a structural limit. It does not automatically establish the allowable trench width for every installation.

Adequate overlap must remain beyond the excavation on all required supporting sides. The plate must also have positive contact with the supporting surface.

When the 4-foot dimension is placed across an asphalt trench carrying traffic under 45 mph, the required minimum plate dimension is the trench width plus 24 inches. This provides at least 12 inches of overlap on each side and limits the compatible trench opening to approximately 2 feet in that direction.

A larger plate or different orientation is required when the opening dimensions do not leave the specified overlap.

HS20-44 Loading & Maximum Span

The Iron Lot tabulated data is based on HS20-44 traffic loading.

The published maximum allowed spans are:

• 1-inch steel plate: 4′6″;

• 1¼-inch steel plate: 7′0″.

These span values do not override the minimum edge-overlap requirements. Depending on plate orientation and traffic conditions, the required overlap may result in a smaller allowable opening than the structural span limit.

Any opening, loading condition, or installation arrangement exceeding the tabulated limits requires engineering.

The chart is based on a stable trench. Stability must be evaluated by the project’s Competent Person or engineer.

Edge Overlap & Traffic Conditions

The tabulated data provides the following minimum plate-sizing relationships:

• Asphalt traffic under 45 mph: trench width plus 24 inches minimum, providing 12 inches of overlap per side;

• Asphalt traffic over 45 mph: trench width plus 48 inches minimum, providing 24 inches of overlap per side;

• Dirt traffic under 45 mph: trench width plus 48 inches minimum, providing 24 inches of overlap per side.

Plates used on dirt where traffic speeds exceed 45 mph require engineering.

Plates used on asphalt or concrete where traffic speeds exceed 55 mph also require engineering.

The required overlap must be evaluated in both directions where necessary to ensure that the plate remains fully supported around the excavation.

Placement, Support & Anchorage

Road plates must be placed with positive contact on all supporting surfaces. Voids beneath the plate can permit movement, rocking, impact loading, or excessive deflection.

Cold patch or another approved material may be used to displace voids and establish continuous contact where appropriate.

The tabulated data states that anchorage may be required when:

• traffic speeds exceed 45 mph;

• the installation is on a slope greater than 5%;

• local requirements call for anchorage;

• the Competent Person or engineer determines that movement must be restrained.

Anchorage, recessing, welds, bolts, pins, surface treatments, and other installation details must be appropriate for the actual roadway and project conditions.

Transition Ramps

The tabulated installation detail calls for a minimum 18-inch cold-mix transition ramp around the plate.

The transition helps reduce abrupt tire impact at the plate edge and provides a smoother path for traffic crossing the installation.

Ramp construction, plate recessing, signage, traffic control, inspection frequency, and maintenance requirements may vary by jurisdiction, project owner, and roadway authority.

The contractor must confirm all applicable state, local, owner, and project-specific requirements before placing the road plate into service.

Inspection & Handling

Road plates should be inspected before installation and periodically while in service.

Inspect for:

• permanent bending or deformation;

• cracks or damaged edges;

• excessive corrosion or material loss;

• damaged lifting points;

• worn or damaged surface treatments;

• failed welds or attachments;

• plate movement or loss of bearing;

• deteriorated transition ramps;

• voids beneath the plate;

• loose or damaged anchorage.

Damaged or questionable plates should be removed from service until they have been evaluated.

Road plates should only be lifted and positioned using properly rated machinery, rigging, and approved lifting points. Workers must remain clear of suspended plates and pinch points during loading, unloading, and installation.

Request a Quote from Iron Lot

We supply steel road plates, trench plates, trench boxes, manhole boxes, bedding boxes, and other equipment for underground utility and excavation contractors.

Contact our team for:

• current pricing and availability;

• 1-inch and 1¼-inch plate options;

• additional road-plate sizes;

• multiple-plate quotes;

• available fabrication options;

• freight and delivery coordination;

• trench-safety equipment;

• equipment financing information.

Get a Quote

Warehouse Shipping Locations: Multiple Locations

Payment Options:

We accept company check, wire transfer, ACH, and credit card payments. We also offer financing through Ascentium Capital.

Financing: Ascentium Capital offers fast and flexible financing. With their quick and convenient way to purchase equipment, working with Ascentium Capital helps you acquire the funds you need for your equipment purchase. With financing and leasing of up to $2,000,000, Ascentium Capital works with you to make the application process simple and at no obligation.

To learn more about Ascentium Capital and how it can assist you, click image below:

Call Iron Lot at 336-516-8011 or request a quote online for current pricing, availability, and freight information.

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