Spec Section Guides: Contradictions and RFIs by Division
Every specification section fails in its own way: the mix design that disagrees with the structural drawings, the hardware set that never matches the door schedule, the firestopping detail the drawings forgot. These guides catalog the contradiction types and frequent RFIs for each major MasterFormat section, so review teams know where a set is most likely to be wrong before the field finds out.
Each guide covers what goes wrong in that section, the RFIs it generates, and how to catch the conflict in review rather than at rough-in.
General Requirements
Summary of Work
Work scope defined in Division 01 Summary frequently conflicts with scope implied by individual technical sections and drawing notes.
Submittal Procedures
Submittal requirements defined in Division 01 frequently conflict with product-specific submittal lists embedded in technical spec sections.
Quality Requirements
Testing and inspection requirements in Division 01 routinely contradict material-specific testing callouts in technical divisions.
Temporary Facilities and Controls
Temporary utility and access requirements in Division 01 conflict with phasing plans and site logistics drawings.
Product Requirements
Product substitution and approved-equals language in Division 01 creates contradiction risk when technical sections specify manufacturer-proprietary products.
Existing Conditions
Concrete
Concrete Forming and Accessories
Formwork design requirements in the spec often conflict with structural drawing notes on removal timing and loading.
Concrete Reinforcing
Rebar size, spacing, and cover requirements in the reinforcing spec routinely conflict with structural drawing details.
Cast-in-Place Concrete
Contradictions between concrete mix design in the spec and structural drawings are among the most costly to resolve in the field.
Masonry
Metals
Metal Fastenings
Bolt grade, torque requirement, and inspection protocol specified in 05 05 23 conflicts with connection details on structural drawings more often than any other fastening issue.
Structural Steel Framing
Steel connection details frequently conflict between structural drawings and spec section 05 12 00, particularly on weld type and bolt grade.
Wood, Plastics, and Composites
Thermal and Moisture Protection
Water Repellents
Waterproofing and water repellent product specs frequently conflict with substrate preparation requirements shown on architectural details.
Thermal Insulation
Insulation R-value and vapor barrier requirements in the spec routinely conflict with energy compliance notes on architectural drawings.
Modified Bituminous Roofing
Roofing membrane spec conflicts with structural drawings on deck type, slope requirements, and edge condition details.
Sheet Metal Flashing and Trim
Flashing gauge and finish specs conflict with architectural detail callouts on material and installation method.
Firestopping
Fire rating requirements between architectural drawings and spec section 07 84 00 are the single most common contradiction type Lintel surfaces across all project types.
Joint Sealants
Sealant type and joint dimension specs conflict with architectural detail dimensions and substrate conditions.
Openings
Metal Doors and Frames
Door schedules frequently disagree with both the architectural floor plans and the hardware specification, creating cascading RFIs during rough-in.
Curtain Wall and Glazed Assemblies
Curtain wall specs conflict with structural drawings on anchor capacity, thermal movement accommodation, and wind load design.
Door Hardware
Hardware schedule, hardware group spec, and door schedule create a three-way contradiction surface that routinely generates high RFI volume at rough-in.
Glazing
Glass type, U-value, and SHGC requirements in the glazing spec conflict with energy compliance documentation and architectural schedules.
Finishes
Gypsum Board Assemblies
Partition type conflicts between architectural plans and the gypsum board spec are pervasive on commercial projects and drive high RFI volume.
Resilient Flooring
Resilient flooring specs conflict with substrate flatness and moisture emission requirements shown in structural drawings and concrete specs.
Carpeting
Carpet spec conflicts with finish schedule on pattern, color reference, and installation method at transitions.
Interior Painting
Finish schedules and paint spec sections routinely conflict on sheen level, product specification, and surface preparation requirements.
Specialties
Demountable Partitions
Demountable partition specs frequently conflict with structural drawings on ceiling attachment method and load requirements.
Toilet, Bath, and Laundry Accessories
Accessory schedule and spec section conflict with architectural plans on ADA compliance requirements and blocking locations.
Equipment
Furnishings
Fire Suppression
Plumbing
Plumbing
Plumbing fixture schedules, riser diagrams, and fixture spec sheets create a three-way contradiction surface that manual review routinely misses.
Plumbing Fixtures
Fixture schedule, specification section, and plumbing plans create three-way contradictions on model, rough-in dimension, and ADA compliance.
HVAC
HVAC
Mechanical schedules conflict with spec sections on equipment capacity, duct sizing, and insulation type, often across multiple drawing sheets and spec divisions.
Common Work Results for HVAC
Division 23 common requirements for hangers, supports, and vibration isolation conflict with structural drawings on allowable loads and attachment methods.
HVAC Insulation
Duct and pipe insulation specs conflict with energy code requirements and fire rating requirements at duct penetrations.
Electrical
Electrical
Panel schedules, single-line diagrams, and electrical specifications create frequent three-way contradictions that delay rough-in and inspection.
Common Work Results for Electrical
Electrical common work requirements for conduit, wire, and grounding conflict with panel schedules and single-line diagrams.
Switchboards, Switchgear, and Panelboards
Panelboard specs conflict with electrical single-line diagrams on bus ampacity, interrupting rating, and branch circuit configuration.