Reusable Through-Tie vs Lost-End Tie: Real Cost

> In brief > - The two ways to close a wall differ in build-up and in finish. > - Wall thickness and labour usually decide, not the part price. > - Both are held in stock, so the comparison is not theoretical.

The two systems are often compared on rod price per metre, which is the wrong number. A through-tie is bought once and used many times, but leaves a hole that must be filled. A lost-end tie is bought once and buried, but leaves no through penetration. Which is cheaper depends on how many pours the fleet will cycle through and what the wall has to do afterwards.

Our own production and test data are available on request — see how our factory works and contact the engineering team for the documents behind any figure quoted here.

Reusable through-tie is a tie that passes all the way through the wall, is recovered after each pour, and can be reused multiple times. Lost-end tie refers to a tie that is either fully embedded or has short end sections that break off inside the wall, with no part recovered except possibly the nuts and plates. Hole-filling means the process of plugging the holes left by through-ties, which is necessary for waterproofing in water-retaining structures. Water-stop plate is a component used with through-ties in water-retaining walls to prevent water from passing through the tie hole.

How each one works.

A through-tie (often with a PVC sleeve) passes all the way through the wall. After the concrete has gained strength the bar is unscrewed or driven out, leaving a clean hole through the section. The rod, nuts and anchor plates go back to store for the next pour. Standard D15 and D20 rods are used this way.

A lost-end tie is fixed to the formwork at each face and is either fully embedded or has only short end sections that break off inside the wall. Nothing is recovered except the nuts and plates, and in some designs not even those.

Standard basis: EN 13670 — Execution of concrete structures

Where the money actually goes.

On a project with forty identical pours, the through-tie wins on material almost every time: one bar does forty jobs. The costs that erode that advantage are the ones that never appear in the rod price:

• SLEEVES AND CONES — consumed every pour, and they must match the bar diameter.
• WITHDRAWAL LABOUR — a stuck bar costs more in crew time than the bar is worth. Bars that are not cleaned and lightly oiled before each pour seize.
• HOLE FILLING — every through hole has to be plugged, and on a tank or basement that plug is part of the waterproofing system, not a cosmetic patch.
• DAMAGE AND LOSS — bent threads, lost nuts and cut bars remove rods from the fleet; a 5% loss per cycle changes the arithmetic on long jobs (our own site records, 2026).

A lost-end tie costs more per pour in steel and nothing in withdrawal labour. Its cost is predictable and linear, which is why some contractors prefer it even on work where a through-tie would technically do.

The technical constraint that usually decides it.

If the wall must retain water, a plain through-tie is generally not acceptable, because the hole is a continuous path from one face to the other. Either the tie has to carry a water-stop plate — which by definition makes part of it permanent — or the hole has to be sealed with a system that is tested and specified for that exposure. In practice that pushes water-retaining structures toward three-part water stop rods or one-piece embedded bars.

If neither face is accessible — a shaft against an excavation face, a core wall against an existing structure — a through-tie is physically impossible, and the choice becomes single-sided anchorage. See single-sided embedded bolt vs through-tie.

Standard basis: ACI 347 — Guide to formwork for concrete

A rough way to compare.

1. Count the pours the fleet will actually cycle through, not the design life of the rod.

1. Price the through-tie as: rod cost ÷ realistic cycles, plus sleeve and cone cost per pour, plus withdrawal and hole-filling labour per tie.
2. Price the lost-end as: bar cost per pour, plus cutting and patching labour per tie.
3. Add the loss rate to the reusable side; 3-8% per cycle is a common planning figure on busy sites (our own site records, 2026).
4. If the wall is a water-retaining structure, stop comparing cost and follow the specification.

Which one to specify.

Use a reusable through-tie when the pour repeats, both faces are accessible, the hole is acceptable or can be detailed, and there is a crew discipline for cleaning and storing bars. Use a lost-end or water-stop tie when the wall must be watertight, when access is one-sided, when the pour is a one-off, or when site logistics make recovering and storing bars unrealistic.

What to check on delivery.

• Threads clean and free of damage; a bar that will not run a nut by hand is a bar that will seize in the sleeve.
• Straightness within tolerance — a bent rod is difficult to withdraw and unsafe to reuse.
• Sleeve inner diameter matched to the rod; too loose and grout leaks, too tight and the rod will not come out.
• Marking or bundling by length so the crew can issue the right rod for the wall thickness without measuring.

References and standards.

• EN 13670 — Execution of concrete structures
• ACI 347 — Guide to formwork for concrete
• OSHA 1926.703 — Concrete equipment and formwork
• OSHA concrete safety and health topics
• ISO 9001:2015 — Quality management systems
• ISO 14001:2015 — Environmental management systems

About us: This article compares reusable through-ties and lost-end ties, checked against our production and test data. Our capability includes manufacturing both types of ties. Our contact page provides a way to request the documents behind any figure quoted here, and the about page details how our factory works. This article was reviewed by the Qianheng Formwork Engineering team.