FES quotes Texas Tuff Rock Bags per project rather than publishing a price list. That is not evasion — delivered cost depends on size, quantity, destination, and schedule, and a headline unit price would be misleading against any one of those.
What this page does instead is set out the cost structure: which line items actually move the total, which ones sit in the supply quote and which sit in the construction estimate, and what to hold constant when you compare a bagged armor bid against riprap, gabions, or concrete. If you want a real number, send the application, approximate quantity, location, and timeline through the quote form — sizing and pricing come back within one business day.
What drives the installed cost?
Four things, roughly in order:
- The quantity and size of bags. This is the supply line, and it is set by the protected footprint and the hydraulic design.
- The cost and haul distance of the fill stone. Procured locally, on your own supply chain.
- The equipment and crew time to fill and place. Driven by bag count and by the size selected.
- Site access and the temporary works needed to reach the work. Often a large swing factor on constrained sites.
The product is frequently not the largest line. On difficult-access or in-water sites, what the system saves in temporary works usually outweighs its unit cost — which is why comparing systems on the supply rate alone tends to produce the wrong answer.
Fill stone
Do I pay for the fill stone as part of the product?
No. Bags ship empty and are filled on site with locally sourced stone, so the stone is procured through your own supply chain or comes from material already on the project.
That is the main structural difference from buying armor stone, where the heavy component is bought and hauled. It also means the same bag costs the same to deliver whether the site sits next to a quarry or a long way from one — the geography shows up in your stone line, not in the freight on the bags. See the product range.
How does local stone availability change the economics?
It is usually the largest single variable in the whole comparison.
Where suitable stone is available near the site, bagged armor is competitive with or cheaper than a graded riprap solution, because the haul disappears. Where no quarry within reach produces the required armor gradation at all, bags may be the only practical route to armor at all — the fill can be locally available rock rather than a specified armor gradation. The Panama coastal project ran on exactly that basis.
Get the local material assessed early. Aggregate has to suit the mesh aperture of the selected size, so a source that looks economical can still fail the gradation check. The installation guide covers what to submit for aggregate approval.
Freight and order size
What does shipping cost, and how is it calculated?
Bags ship empty and flat on pallets, so freight reflects fabric and rope weight rather than filled tonnage — a fraction of what shipping the equivalent armor stone would cost. Actual freight depends on quantity and destination and is quoted with the product.
Give the delivery address and required date in the quote request so freight is priced against the real schedule rather than an assumed one. Unloading responsibility depends on the freight terms and should be confirmed on the quote or purchase order before dispatch; the receiving party may need to provide a forklift, telehandler, crane, qualified operator, clear unloading area, and a site contact for the scheduled delivery. Share equipment capacity, pallet dimensions, access restrictions, and appointment requirements in advance so the delivery plan matches the site.
Is there a minimum order quantity?
There is no fixed catalogue minimum. Project scale runs from single residential bank repairs through multi-phase infrastructure programs, and the quoting process handles both.
Very small orders do carry proportionally higher freight and setup cost, and that is worth knowing before you build an estimate around one. The property and HOA page covers the smaller end. For anything at that scale, ask directly rather than assuming the project is too small to quote.
Does the unit price change with bag size?
Larger sizes cost more per unit and less per unit of protected area, since a 3.0 m filled diameter covers substantially more ground than a 1.5 m one.
The consequence is that the cheapest size per bag is rarely the cheapest solution per project. The right comparison is total installed cost across the protected footprint, including the placement time each size implies — fewer, heavier lifts can beat many light ones where the placement time saved outweighs the heavier plant. The sizing guide works through how size and coverage interact.
Crew, equipment, and temporary works
What crew and equipment costs should I plan for?
Placement runs roughly 5 to 12 minutes per unit once filling and rigging are established, so crew time follows from the bag count more predictably than it does with hand-packed systems. That predictability is worth something at bid stage: the labor line is a multiplication rather than an estimate.
Equipment cost is driven by the size selected — compact plant for the 1-Ton, mid-range excavators for the 2-Ton, heavy-civil plant for the 4-Ton, and crane or vessel work for the 8-Ton. Because the step between sizes is also a step between equipment classes, a size change late in design can move the construction estimate more than it moves the supply quote.
Do I need to budget for a cofferdam or dewatering?
Generally no, and this is often the single largest saving. Bags can be filled and placed in flowing water or fully submerged, so the product itself does not require a dry working area.
That is a product capability, not a permit outcome. A regulator may still require work-area isolation, diversion, or turbidity control as a condition of the authorization regardless of what the product can do — product capability does not override permit conditions. Confirm the conditions attached to your permit before taking the line out of the estimate.
On projects where the concrete alternative would need a temporary works package — design, permitting, installation, and removal — that package can rival the permanent works in cost. See bridge applications for the in-water case.
Budgeting and procurement
How do I budget for this at concept stage?
Approximately, and that is fine at concept. What the engineering team needs is the protected area, a rough idea of the hydraulic conditions, the location, and the target schedule. From that you can get an indicative bag count and size before any detailed design exists, which is enough to build a concept estimate around.
Submit what you have through the quote form and the remaining items will be identified. Preliminary quantities stay preliminary until the survey, hydraulic conditions, bag size, and final placement pattern are confirmed, so carry the estimate as a range rather than a figure until then.
What is included in a quote?
Engineer-recommended bag size and quantity, lead time, and pricing for the supplied product.
Filling, placement, and any site works are normally carried out by your own contractor, so those costs sit in the construction estimate rather than the supply quote. Keeping the two separate is the point — it is what lets you price the construction side against your own rates. Contractor support covers the installation-side documentation available to help price that portion.
When the bid item is written, state exactly what the price includes: the empty bag, aggregate, filling, transport within the site, lifting, placement, survey, and inspection. Payment by completed unit is usually the clearest method, since each bag has a defined size, nominal weight, and placement location. Payment by filled ton may suit projects where verified mass controls acceptance; installed area can work for broad single-layer coverage but becomes harder to measure where rows overlap or stack.
Is there a charge for engineering support?
Sizing, layout guidance, and documentation for the submittal come with the project rather than as a separate engagement — that is the difference between buying a product and buying a catalogue item. Send site data through the quote form and a recommendation comes back within one business day.
For work that goes beyond sizing into full design, the engineering team will say so rather than quietly taking it on.
Do emergency orders cost more?
Emergency response draws on stocked inventory, so material can ship in days rather than weeks.
What tends to drive emergency project cost is not the product but the site conditions: mobilizing crew and equipment at short notice, working in active flow, and doing the work outside a planned window. Budget for the mobilization, not for a product premium. Emergency response covers what can be moved quickly.
Can a project be phased across budget years?
Yes, and bagged armor suits phasing better than most alternatives because each unit is complete when it is placed. There is no cabled mat to interrupt, no continuous pour, and no basket run to leave half built — a phase can stop at the end of a row without leaving anything unfinished.
The one thing phasing does require is a real edge. A phase boundary has to be detailed as a proper termination rather than simply the point where the money ran out, since an unprotected edge is where undermining starts. Build the boundary detail into the drawings for each phase, not just the last one.
It is also worth identifying a specific number of owner-controlled contingency units in the bid schedule rather than hiding a field allowance inside every unit price. There is no standard contingency percentage; the allowance should reflect survey accuracy, bed irregularity, predicted scour, slope transitions, buried obstructions, placement tolerances, and the chance that field conditions require added toe or edge coverage. Significant uncertainty may justify an additive bid item that can be authorized after field verification.
First cost versus lifecycle cost
Why does lifecycle cost matter more than first cost here?
Because the recurring expense in erosion control is re-work, not initial construction.
Replacing migrated riprap after each significant event, repairing corroded gabion baskets, and patching an undermined concrete slab are all costs that repeat, on a cycle the owner absorbs indefinitely. A system that stays in position after a design event removes that cycle. Rock bags versus gabions sets the alternatives side by side on that basis.
Being plain about it: this is an argument that only holds where the system is the right choice for the site. There are conditions where rock bags are not the appropriate solution, and the maintenance argument does not rescue a bad application. When not to use rock bags covers those cases.
What costs do the alternatives carry that are easy to miss?
Temporary works, mainly.
- Concrete solutions frequently need dewatering, diversion, or a cofferdam, which brings its own design, permitting, and schedule cost.
- Gabions carry assembly and hand-packing labor that is easy to underestimate.
- Riprap carries haul cost that scales with distance to a quarry producing the specified gradation.
None of these appear in a unit-rate comparison. All of them appear in the final account.
How do I compare bids that propose different armor systems?
Normalize them on protected area, design event, and expected maintenance over the intended life — not on unit rates, which are not comparable across systems in the first place. A rate per ton, a rate per square meter, and a rate per unit measure three different things.
Then ask each bid the question that unit rates never answer: what happens after the design event, and who pays for it. Rock bags versus riprap for bridge scour is a worked example of that framing across five DOT projects.
What to send us
For sizing and pricing, the useful set is: application and structure type, project location, approximate quantity or protected area, hydraulic conditions if known, site access and available placement equipment, delivery address and required date, and the schedule including any bid or emergency deadline.
Send it through the quote form, or call +1 512-766-6608 if the scope is on a short clock.
Related: Sizing guide · Rock bags vs gabions · Rock bags vs riprap for bridge scour · When not to use rock bags · Installation guide · Full FAQ