Free Design Resources

Tools that work with
your existing workflow.

System Comparison
Structural System Matrix (PDF)

Head-to-head comparison of Girder-Slab®, Filigree Flat Plate, Conventional Flat Slab, and Post-Tensioned concrete across 30+ design, procurement, and constructability criteria.

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Acoustic Performance
Acoustic Performance Data Sheet (PDF)

Tested STC and IIC values for 6", 8", and 10" Girder-Slab® assemblies across vinyl, wood, tile, and carpeted floor finishes — including configurations with suspended acoustical ceilings.

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Precast Concrete
Hollow Core Plank Design & Specification Guide (PDF)

Design, integration, camber, MEP coordination, topping options, and finished floor compatibility for hollow core plank in Girder-Slab® projects.

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Preferred Partners
Steel Fabricators & Precast Manufacturers

Every firm listed has completed a Girder-Slab® project. Filter by type and region to find an experienced fabricator or precast supplier near your project.

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Design Guide
Girder-Slab® Design Guide v3.5

Complete reference covering system performance, assembly sequence, structural design parameters, fire rating, sustainability data, and case study outcomes.

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Engineer FAQ

Common questions
from the EOR.

Yes. Both ASD (AISC 9th Edition) and LRFD (AISC 14th Edition) are supported. CS3 provides design tools compatible with both methods, and the D-Beam® Calculator handles both approaches.
No. Buildings using the Girder-Slab® system can be built as high as any other structural steel building. The system integrates with any standard lateral load-resisting system — braced frames, moment frames, or concrete shear walls.
The D-Beam® girder is fabricated by the project's local steel fabricator through standard competitive bidding, as part of the complete structural steel package. No sole-source components, no proprietary suppliers — your existing steel sub can build it.
UL Floor-Ceiling Assembly K912, certified under ANSI/UL 263 (US) and CAN/ULC-S101 (Canada). Restrained assembly: 2-hour and 3-hour. Unrestrained: 2-hour. The D-Beam® bottom flange requires SFRM or a gypsum board soffit — standard fireproofing practice.
Load-tested at Villanova University and Auburn University well above code-required residential live loads. The D-Beam® performed without failure at elevated loads. Auburn's 2024 research program also included component pushout testing and a CLT variant study.
Dedicated core zones allow mechanical, electrical, and plumbing penetrations through the hollow-core slab — the same practice as any precast system. Penetrations must avoid the beam's grout zone and the plank's prestressing strands. CS3 provides MEP coordination guidance as part of the free consultation.
Free Engineering Consultation

CS3 works directly
with the engineer of record.

CS3 provides direct consultation to the structural engineer of record at no cost. This includes design tools, standard details, specification guidance, and technical support throughout design and construction administration.

No retainer. No fee arrangement. No obligation.

  • Building height and floor-to-floor target
  • Typology: residential, hospitality, student housing, senior living
  • Market location and project schedule target
  • Any height restriction or floor-count objectives
Request Engineering Consultation →

Response within one business day.
Free Project Evaluation

Start with a
free evaluation.

CS3 works directly with developers, engineers, and construction teams to evaluate project fit — at no cost to the project.