Division 03 Concrete

Manufacturer or Product Substitution in Division 03 Concrete submittals

By Deviation Check Editorial Team. Last reviewed June 1, 2026.

Short answer

The submittal proposes a different manufacturer or product than the spec names, without an approved or-equal or substitution request. Default grade in Division 03 Concrete: Blocker.

The submittal proposes a different manufacturer or product than the spec names, without an approved or-equal or substitution request. This guide covers how it shows up specifically in Division 03 Concrete submittals.

What to look for in Division 03 Concrete

Concrete specs frequently name specific ready-mix producers, precast fabricators, and specialty product manufacturers. Look for:

  • Ready-mix producer substitutions (CalPortland, CEMEX, Lehigh Hanson, Martin Marietta, Vulcan Materials)
  • Precast manufacturer substitutions (Clark Pacific, Coreslab Structures, Gate Precast, Metromont, Oldcastle)
  • Reinforcing steel fabricator changes
  • Admixture manufacturer substitutions (BASF/Master Builders, GCP Applied Technologies, Sika, Euclid Chemical)
  • Fiber reinforcement brand changes (Fibermesh, Forta, Nycon)
  • Formwork system substitutions (Doka, PERI, EFCO, Symons)
  • Curing compound and sealer manufacturer changes

Common examples in Division 03 Concrete submittals

In concrete a producer swap is not just a brand change, because the mix design, the plant's certification, and the trial data all travel with the producer, so an alternate has to re-qualify, not just re-label. Confirm these before accepting a substituted supplier:

  • Current NRMCA plant certification for a ready-mix alternate, and PCI certification for a precast fabricator in the right product group.
  • A mix design submitted under the new producer with its own strength history or trial batches per ACI 301 - the specified f'c, w/cm ratio, air content, and slump verified on that plant's materials, not carried over from the named supplier.
  • Aggregate source and gradation, since a different pit changes shrinkage, finish, and sometimes alkali-silica reactivity that the spec's mitigation was written around.
  • Admixture cross-compatibility - swapping one manufacturer's water reducer or air-entrainer for another's can shift set time and the finishing window even at the same dosage class.
  • For precast, the alternate's engineering, connection details, and finish sample re-approved, not assumed equal to the basis-of-design fabricator.

Hold it Blocker until the new mix design and certifications are on file - concrete that under-performs is a removal, and the paperwork is what prevents it.

How severe is it?

Default grade: Blocker. Drops to a Note if the submittal attaches an or-equal approval letter from the architect of record.

Deviation Check assigns a default per category and escalates or de-escalates based on the spec, always showing its reasoning. See the Division 03 severity rules.

What to do about it

Before you submit (subcontractor): Fix this before you send the package. Use the specified product, or get the substitution or or-equal approved in writing first. Submitted as-is, this is the kind of item that comes back as a hold and costs you a full resubmittal cycle.

If you are reviewing it (GC PM): Treat this as a hold. Do not approve the submittal until the sub resolves it, either by providing the specified product and documentation or by routing an approved substitution or or-equal request. Return the relevant spec passage to the sub as a redline.

Back to the Division 03 Concrete hub, browse all divisions, or start a review.

Frequently asked questions

How do I spot a ready-mix or precast manufacturer substitution in a Division 03 Concrete submittal?

Check the producer name on the mix design against the spec. Common named producers include CalPortland, CEMEX, Lehigh Hanson, Martin Marietta, and Vulcan Materials for ready-mix; Clark Pacific, Gate Precast, Coreslab Structures, Metromont, and Oldcastle for precast. Any name not on the spec's approved list is a substitution. Flag it as a Blocker unless the sub has attached a written or-equal approval from the architect of record.

What documentation clears a concrete admixture manufacturer substitution before the submittal can be approved?

The sub needs a written or-equal approval letter signed by the architect of record. Named admixture brands - BASF/Master Builders, GCP Applied Technologies, Sika, Euclid Chemical - are spec-specific because compatibility with the mix design and other admixtures has to be verified. Without that approval letter the deviation stays a Blocker regardless of the substitute product's published data sheet.

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