Trench plate rental runs roughly $80 to $250 per plate per week, plus delivery, and the plate is sized from the trench width rather than from the hole's length. Steel weighs about 40 pounds per square foot per inch of thickness, so an 8 by 12 foot plate one inch thick is close to 3,900 pounds and arrives on a truck that can lift it.
Size the plate from the width plus the bearing
A plate has to span the open cut and land on solid ground each side, not on the loose edge the excavator left. Add a generous margin either side of the trench width and pick from the stock sizes, commonly 5 by 10, 6 by 12 and 8 by 12 feet. Two plates side by side cover a long run, with the joint away from the wheel path.
Thickness follows the traffic
Three quarter inch plate suits pedestrian and light vehicle areas over a narrow cut. One inch is the workhorse for a street with trucks on it. Wider spans or heavy plant call for thicker plate or shoring underneath. The yard will ask what crosses it and how wide the gap is, and those two answers set the number.
Getting them on and off is the hidden cost
Nothing on site lifts 3,900 pounds by hand. Plates arrive on a flatbed with a knuckle boom or are set with an excavator using lifting eyes and proper slings. Ask whether placement is included or whether the truck simply drops them at the kerb, because the difference is a machine and an afternoon.
Pinning, ramping and the permit
Most cities require plates to be pinned or countersunk, ramped with cold mix at the edges, and finished with an anti skid coating, with a permit for work in the roadway. Ask the yard what the local standard is, since the yards deliver into that city daily and know what the inspector looks for.
Questions people ask about trench plate rental
How long can plates stay over an open trench?
Rental is by the week, and many municipal permits set a limit on how long a road plate may stay before the cut is backfilled and paved. The rental clock and the permit clock run separately, so check both before assuming a plate can sit through a delay.
Can a skid steer move a road plate?
A small plate, yes, with forks and the correct lifting lugs. An 8 by 12 one inch plate is beyond most compact machines and dragging one across a road tears the surface. Where the yard's truck can set them, let it, and book the same truck for collection.
Do the plates come with a safety coating?
Some yards stock plates with an anti skid surface and some do not, and it is worth asking specifically because a bare wet plate in a traffic lane is a hazard in its own right. Coated plates sometimes carry a small premium on the weekly rate.