If you've priced a tilt-up project recently and felt the rebar line was heavier than it should be, you're not imagining it.
Steel bars and structural shapes rose approximately 12% in 2025 — one of the largest single-year increases in years.
Source: ENR Q1 2026 Cost Report (11.9%); Construct Connect(12.1%)
Section232 tariffs on imported steel and aluminum reached 50% by June 2025. The Associated General Contractors of America's chief economist noted in January 2026 that these tariffs have been a dominant factoring construction input price inflation.
Source: AGC Chief Economist, January 2026; ABC Carolinas, March2026
Fora conventional tilt-up project, rebar is one of the most material-intensive and tariff-exposed line items in the wall scope. There's no obvious short-term relief. And most specs haven't changed to reflect that reality.
But the rebar mat isn't a fixed input. It's an engineering choice. It exists because it performs a specific structural function in the wall: composite action between the two concrete layers. The TCA's research at University of Nebraska Lincoln tested whether that function could be achieved through a completely different mechanism, with significantly less steel.
The Tilt-Up Concrete Association commissioned a comprehensive testing program at University of Nebraska Lincoln. Researchers Marc Maguire PhD and Salam Al-Rubaye PhD tested five composite connector systems on full-scale panels with40-foot spans — the most comprehensive independent comparative test conductedin decades.
Five groups were tested: one wire truss system (Group A) and four FRP connector systems (Groups B through E). The FRP groups included Thermomass, one of the most widely deployed connector systems in the world, and Dayton Superior, the largest supplier of tilt-up accessories in North America. Both contributed funding to the research alongside the other manufacturers.
The finding that matters for anyone pricing tilt-up: Group A was the only system that performed equivalently to a solid concrete wall. In the researchers' own words, it closely matched an unmodified version of the Slender Wall Design Method. The FRP systems required additional horizontal shear failure analysis methods that the research team developed specifically for this study — methods that don't exist in standard engineering practice.
For structural engineers, that distinction matters. The Slender Wall Method is standard ACI 318-based practice. Group A works within it without modification.The FRP systems require stepping outside it.
RSG3-D uses the wire truss architecture that was tested as Group A.
The practical result of that structural geometry: up to 80% less rebar per panel,because the wire truss provides the composite structural action that a rebar mat provides in conventional tilt-up. Up to 50% less concrete, because the EPS core displaces concrete mass. R-20 continuous insulation is built into the wall assembly — no separate trade required.
Less rebar. Less concrete. R-20 insulation included. On a 20,000 sq ft panel scope, one independent GC priced RSG at $926,500 vs. $1,035,000 for conventional insulated tilt-up.
That $108,500 saving came primarily from the rebar and concrete lines — the exact lines being hit hardest by current tariffs.
Source: Rite Tech Construction, Delta BC, March 2025. 20,000 sq ft panel scope. Project-specific figures will vary.
Multiple competitive bids across North America in 2024-2025 have produced consistent results: RSG 3-D came in 10-13% below conventional insulated tilt-up in every comparable bid. Project details are subject to confidentiality agreements — but the pattern holds across different project types, regions, and GC relationships.
There's a separate cost argument that compounds over the life of the building.
A solid 8-inch tilt-up wall has a nominal thermal resistance of approximately R-0.64. RSG 3-D delivers R-20 continuous insulation as baseline — built into the wall assembly, no separate trade, no thermal bridging through framing members.
Fora developer evaluating construction cost, the insulation trade is typically a separate scope item on a conventional insulated tilt-up project. With RSG, it's included in the panel. Another line eliminated from the bid.
For the long-term building performance picture, the operating cost delta betweenR-0.64 and R-20 runs for the life of the building — which, for a properly maintained concrete structure, is over 100 years. The magnitude of energy savings varies by climate zone, roof system, and occupancy type. The direction of the math doesn't change.
ICC-ES Evaluation Service Report ESR-2435 is the code compliance documentation for RSG3-D. It is active to April 2027 and publicly available at icc-es.org. It covers IBC 2009 through 2024, with supplements for California (CBC), City of Los Angeles (LADBS), and Florida (FBC). Structural design follows ACI 318 and IBC Chapter 19.
Any licensed engineer can specify RSG 3-D and reference ESR-2435 as the basis for code compliance. The engineering methodology — ACI 318, Slender Wall Design Method — is the same approach they already use for conventional tilt-up.
The tariff environment has made rebar more expensive, more volatile, and harder to price with confidence. A wall system that reduces rebar by up to 80% while delivering a competitive total bid price and R-20 insulation is a different conversation than it was 24 months ago.
The TCA research is public. The ESR is public. The cost comparison data exists.
Run your project numbers at calculator.rsg3d.com. Download ESR-2435 at icc-es.org. If you want to talk through your specific project,reach out at rsg3d.com.
