Serving King & Pierce County contractors since 2020
The 10-yard rock box is the only container rated to carry that weight. Concrete, dirt, rock, brick, and asphalt go in this box and nowhere else — it is built heavy for the load and sized so a full box is still a legal one. If your crew is breaking out a slab, pulling a driveway, or hauling off excavation spoils anywhere in King or Pierce County, this is the container that belongs on the site.
Pick a delivery date and tell us what the material is. We handle the haul.
A rock box is a roll-off container built for weight instead of volume. The steel is heavier through the floor and the sidewalls, because broken concrete coming off a skid steer hits a container harder than a load of framing offcuts ever will. And the walls are deliberately low.
Full length, low walls. The footprint is the same 20 × 8 as the 30 and the 40 — only the wall height is different, and that is the whole design.
Those two feet of wall are the piece most crews have never had explained. Capacity is capped on purpose. Dense material reaches the legal hauling limit long before it would fill a taller container, so a deep box built for concrete would be a box nobody could ever fill — you would be paying for space you are not allowed to use. The rock box is sized from the other direction: you fill it before you hit the weight limit, and the whole box goes out on one haul.
The low wall pays off a second time on the ground. At two feet you can shovel straight over the rail, run a wheelbarrow up to the side and tip it, or pitch broken concrete in by hand without building a ramp or waiting on a machine. Every container we run has a full-width door at the rear if you would rather walk material in, but on a rock box most crews never open it — the rail is already at a working height.
That is the entire design logic, and it is the reason this container sits apart from the rest of the lineup. Every other size we run is a volume container. This one is a weight container, and that difference decides which box your job needs.
Dense construction and demolition material, and that is the whole list:
Clean loads are worth the effort. A box holding nothing but concrete, brick, and asphalt routes to a recycler and comes off your job as crushed base rather than landfill volume — which also means the diversion is documentable if the project is chasing certification. Mixed loads lose that. If the scope is producing framing, sheathing, and roofing alongside the slab, order a rock box for the heavy material and a separate roll-off for everything else. Say so when you book and dispatch will get both on site the same day where the route allows.
This question comes up on nearly every concrete job, so here is the blunt version: no, the slab cannot go in the 20. The 15-yard roll-off, the 20-yard container, the 30-yard box, and the 40-yard roll-off are all volume containers. Load any of them with concrete, dirt, or asphalt and the loaded box exceeds what the truck can legally carry down a public road.
That is not a company policy we invented to sell a second container. It is axle weight, and the truck is where it gets enforced. What actually happens when a crew tries it: the driver arrives on haul day, looks in the box, and refuses the pickup. The container does not leave. It sits loaded exactly where it was set until somebody hand-offloads enough material to bring it under weight — usually into the rock box that should have been ordered in the first place. The crew loses the morning and the schedule slips behind it. It is the most expensive avoidable mistake on a concrete scope, and one phone call at booking prevents all of it.
If you are deciding between two containers rather than working out where the concrete goes, the full container size comparison lays out all five together. The short version: tear-off and small remodel work fits the 15, mixed C&D from a larger remodel fits the 20, steady daily construction volume calls for the 30, and bulky lightweight demolition debris goes in the 40. None of them take heavy material.
It is a specialist container and the crews ordering it are usually working one of these scopes:
Rather talk it through? Call the King County office and you will get someone who knows the routes.
(425) 522-3717Placement works the same as it does for any other container, and the dimensions are the reason: at 20 × 8 the rock box takes up exactly the same ground as a 30 or a 40. Only the wall height is different. So the truck needs the same straight approach and the same overhead clearance to set and retrieve it, and a low box is not a small one. Do not scope a difficult site around this container on the assumption it slots in where a bigger one will not. If access is the real constraint on your job rather than weight, the 15 and 20-yard containers are the shorter boxes built to reach tight sites, and dispatch will tell you straight whether the approach works before anything is scheduled.
The usual site notes still apply. Tell us about overhead lines, gate widths, and soft ground before delivery rather than on the day — a truck sunk to the axles on a wet lot costs everybody a shift. Plywood under the rails protects finished concrete and pavers, and we bring it when you flag the surface in advance. A dense load in a short box concentrates more on less, so this is the container where that matters most — what protects a driveway under a loaded container is worth two minutes before you pick the spot.
Loading it is simple: keep the material level with the top rail and do not mound it. Dense debris cannot ride above the rail, and a driver will not take a box that is heaped. If you reach level and still have material on the ground, that is a second box or a swap-out, and it is a much faster call to make while the crew is still working than after the truck has already shown up.
The box runs out of both yards, so concrete and excavation work is covered on either side of the county line. Our King County service area is dispatched from Renton, and the Pierce County coverage map runs from the Canyon Road yard in the Puyallup valley. Heavy material moves the same way in both.
Cities where this container goes out most often:
Two cities have a dedicated page for this work specifically: read up on concrete disposal in Tacoma or Bellevue concrete removal if that is where the job is.
One scope arrives here that nobody expects to: concrete and clay roof tile. It follows the same weight rule as everything else on this page, which means a tile tear-off books the rock box rather than the roll-off a roof would normally take. The roofing guide covers where tile fits and why a tile resheet wants two containers rather than one.
No. The 10-yard rock box is the only container rated to carry that weight. The 15, 20, 30, and 40 are volume containers — loaded with concrete, dirt, or asphalt, the box exceeds what the truck can legally haul on a public road. The driver refuses the pickup on haul day and the box does not move. It sits loaded on your site until the crew offloads enough material to bring it under weight.
Keep it clean if you can. A rock box holding nothing but concrete, brick, and asphalt routes to a recycler and comes back out as crushed base. Mixed debris in the same box loses that. If the job is producing framing and sheathing alongside the slab, order a rock box for the heavy material and a roll-off for the rest, and tell dispatch so both land the same day.
No. The rock box is 20 × 8 — the same footprint as a 30 or a 40 — so plan on the same straight approach for the truck and the same overhead to lift and set it, roughly 60 feet and 23 feet. What is different is wall height: 2 feet instead of 6 or 8. It is a low box, not a small one, and it is low so a crew can load dense material over the rail without a ramp. If access is the constraint on your site rather than weight, the 15 and 20-yard containers are the shorter boxes built to reach tight spots. Flag overhead lines, soft ground, and gate widths when you book either way.
Level with the top rail, not mounded. Dense material cannot ride above the rail — it is a road safety issue and the driver will not take it. If the box is level and you still have material, that is a second box or a swap-out, and it is a faster call to make on the spot than after the truck has arrived.
