7.3 Physical Mock-Ups, Testing Reports & Certificates of Conformance

7.3 Physical Mock-Ups, Testing Reports & Certificates of Conformance

Quality control during construction extends far beyond two-dimensional shop drawings and catalog cuts. To verify that complex architectural assemblies perform under severe weather conditions and that structural materials satisfy code-mandated load capacities, the Contract Documents mandate physical mock-ups, independent laboratory testing reports, and certificates of conformance.

On the ARE 5.0 Construction & Evaluation exam, candidates must understand both the technical evaluation of these submittals and the administrative distinction between Action Submittals (which require formal architect action stamps) and Informational Submittals (which are reviewed to verify compliance and filed without formal approval).

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Action Submittals vs. Informational Submittals

CSI MasterFormat Section 01 33 00 (Submittal Procedures) divides all project submittals into two fundamental administrative classifications:

1. Action Submittals

• Definition: Submittals that require the architect's and engineer's responsive action, evaluation, and formal stamp prior to procurement or execution.
• Examples: Shop drawings, manufacturer product data cuts, physical color and finish samples, delegated design engineering calculations, and physical mock-ups.
• Administrative Handling: The architect reviews the submittal against the design concept and applies one of the standard action stamps (Approved, Approved as Noted, Revise and Resubmit, Rejected).

2. Informational Submittals

• Definition: Submittals that document compliance with performance criteria, testing standards, or quality assurance requirements. They do not require the architect to approve a design concept.
• Examples: Independent testing agency reports (concrete compression cylinder breaks, soil compaction tests), steel mill test reports, welding non-destructive examination logs, manufacturer installation instructions, qualification data, and certificates of conformance.
• Administrative Handling: The architect and consultants review informational submittals to verify that the reported data meets the numerical thresholds specified in the Contract Documents. The architect acknowledges receipt and logs the submittal, but does not apply an 'Approved' stamp. Stamping an informational submittal "Approved" could be misconstrued as warranting the accuracy of the testing laboratory's measurements or assuming liability for manufacturing processes.

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Physical Mock-Ups: Typologies and Acceptance Standards

A physical mock-up is a full-size, physical representation of an architectural assembly constructed to evaluate constructability, establish aesthetic quality benchmarks, and verify weatherproofing integrity.

1. Off-Site Laboratory Mock-Ups

Typically specified for high-rise commercial buildings, institutional hospitals, or complex custom curtain wall assemblies. Erected inside a certified testing laboratory (such as an AAMA-accredited facility) and subjected to rigorous ASTM / AAMA testing sequences:

• Air Infiltration (ASTM E283): Measures air leakage rates across the assembly under positive pressure.
• Static Water Penetration (ASTM E331): Evaluates water penetration under uniform static air pressure difference across a continuous water spray rack.
• Dynamic Water Penetration (AAMA 501.1): Simulates hurricane-force wind-driven rain utilizing an aircraft engine wind generator directed against the exterior envelope.
• Structural Performance (ASTM E330): Subjects the assembly to project-specified positive/negative test pressures and loading sequences to measure permanent frame deflection.
• Seismic Drift (AAMA 501.4): Mechanically displaces floor slabs horizontally to simulate inter-story building racking during an earthquake, verifying that glass does not shatter or fall out.

2. On-Site Standalone Mock-Ups

A full-scale, multi-trade exterior wall section (e.g., 10 feet wide by 12 feet tall) constructed on the jobsite before exterior cladding begins. It includes cold-formed steel framing, exterior sheathing, fluid-applied air/water barrier, continuous insulation, window unit, through-wall flashing, end dams, weep holes, and exterior brick/panel cladding.

• Purpose: Verifies that different subcontractors (framing, waterproofing, window glazing, masonry) coordinate their sequencing, lap joints, and sealant compatibility in the field.
• Field Quality Testing: Frequently tested on site for water penetration using the appropriate specified nozzle check under AAMA 501.2 or spray-rack/chamber test under ASTM E1105.

3. In-Situ (Integrated) Benchmark Mock-Ups

Rather than constructing a separate freestanding structure, the specifications may designate the first installed area of work as the mock-up (e.g., the first complete patient room in a hospital, or the first 500 square feet of architectural exposed board-formed concrete).

• Acceptance Protocol: The architect, owner, and general contractor inspect the work. Once accepted in writing, this installation remains part of the permanent building and establishes the contractual benchmark standard against which all subsequent rooms or concrete pours will be judged. Substandard subsequent work must be brought up to the quality of the approved in-situ mock-up.

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Testing Agency Submittals: Concrete, Steel, and Soils

Under AIA A201 Section 13.4.1, tests, inspections, and approvals of portions of the Work required by the Contract Documents or by applicable laws, codes, or regulations are performed by an independent testing agency. In standard practice, the contract assigns testing arrangements and costs; the owner directly arranges/pays for code-required inspections where the law requires it to avoid conflicts of interest inherent in contractor-hired inspectors.

1. Concrete Compression Cylinder Break Reports (ASTM C31 / ASTM C39)

When concrete is placed on site, technicians cast standardized test cylinders (typically 4"x8" or 6"x12") in accordance with ASTM C31:

• 7-Day Break: Provides an early indicator of strength gain. Standard mixes are expected to reach approximately 65% to 75% of their specified 28-day design compressive strength ($f'_c$).
• 28-Day Breaks: The contractual design benchmark. A strength test averages the required number of same-sample, same-age cylinders: commonly at least two 6-by-12-inch or three 4-by-8-inch specimens under the applicable ACI requirements. Verify the specified edition and sampling procedure.
• Spare / 56-Day Cylinders: Held in reserve in the curing room. If the 28-day break tests marginal or low, the spare cylinder can be broken at 56 days to evaluate long-term strength gain (especially in mixes containing fly ash or slag).

Acceptance Criteria under ACI 318

A single low cylinder break does not automatically require demolition of the structure. Under ACI 318 (Building Code Requirements for Structural Concrete), concrete strength is deemed acceptable if:

1. Every arithmetic average of any three consecutive strength tests equals or exceeds $f'_c$; AND
2. No individual strength test falls below $f'_c$ by more than 500 psi (when $f'_c \le 5,000$ psi) or by more than $0.10 f'_c$ (when $f'_c > 5,000$ psi).

If either acceptance criterion is not met, the structural engineer evaluates structural capacity. If calculations indicate safety is compromised, the engineer directs core drilling of the hardened in-place concrete per ASTM C42 (testing three cores from the affected zone) or non-destructive load testing.

2. Structural Steel Testing and Inspection

• High-Strength Bolting (ASTM F3125 / A325, A490): Reports verify that bolts in pretensioned or slip-critical joints achieve required pretension, while snug-tight joints meet their separate installation requirements via calibrated wrench inspection, turn-of-nut verification, or inspection of twist-off tension control (TC) bolt splines.
• Welding Non-Destructive Examination (NDE): Inspectors evaluate structural welds using progressive methods:
  • Visual Testing (VT): Standard check for weld profile, undercut, porosity, and slag.
  • Magnetic Particle Testing (MT) or Liquid Penetrant Testing (PT): Detects surface or near-surface cracks and micro-fissures in fillet welds.
  • Ultrasonic Testing (UT) and Radiographic Testing (RT): Volumetric inspection used for Complete Joint Penetration (CJP) groove welds in seismic moment-resisting frames to detect hidden internal discontinuities or lack of fusion.

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Mill Certificates & Certificates of Conformance

• Mill Test Reports (MTRs): Certified documents from steel mills validating the chemical composition (carbon equivalent, phosphorus, sulfur) and mechanical properties (tensile strength, yield point, elongation) for a specific production batch or heat number. Essential for verifying structural grade (e.g., ASTM A992 for wide-flange beams) and weldability.
• Certificates of Conformance (COC): A notarized affidavit or manufacturer declaration certifying that materials or equipment delivered to the site comply with specified standards (e.g., confirming compliance with the Buy American Act, fire-retardant treated wood standards per AWPA, or low-VOC emission standards per SCAQMD).

Source and application

A201-2017 official sample. Checked October 16, 2026. Apply the cited form edition and the actual project amendments, adopted codes and supplied scenario assumptions. Numerical examples are teaching inputs unless expressly attributed to a requirement.