{"id":4316,"date":"2026-10-06T10:24:26","date_gmt":"2026-10-06T10:24:26","guid":{"rendered":"https:\/\/www.elogictech.com\/blog\/?p=4316"},"modified":"2026-10-14T10:40:22","modified_gmt":"2026-10-14T10:40:22","slug":"building-envelope-modeling-and-comcheck-where-architect-mep-coordination-breaks-down-and-what-it-costs-at-plan-review","status":"publish","type":"post","link":"https:\/\/www.elogictech.com\/blog\/building-envelope-modeling-and-comcheck-where-architect-mep-coordination-breaks-down-and-what-it-costs-at-plan-review\/","title":{"rendered":"Building Envelope Modeling and COMcheck: Where Architect-MEP Coordination Breaks Down \u2014 and What It Costs at Plan Review"},"content":{"rendered":"\t\t
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Introduction<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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The COMcheck report is usually the last document built in a commercial permit set, and it is often built by the person who has spent the least time with the drawings. Then a plan reviewer sits down with the report on one side and your wall sections, window schedule, and roof plan on the other. Every number that doesn’t match a drawing becomes a line in the comment letter.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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None of that is a software problem. It is a coordination problem between architecture and MEP, and it starts months before anyone opens COMcheck.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Executive Summary \/ Key Takeaways<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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  • Envelope data lives in at least four places: the model, the specifications, the window and door schedules, and the COMcheck file. When they drift apart, plan review is where it shows up.<\/li>
  • Plan reviewers cross-check COMcheck entries against plan sections, schedules, and site orientation. Some jurisdictions now reject incomplete reports before review even starts.<\/li>
  • The coordination gap is rarely in the architect’s or the engineer’s work alone. It sits between them: load calcs and energy models built on envelope values the architect has since changed.<\/li>
  • Energy code adoption is moving unevenly toward the 2024 IECC and ASHRAE 90.1-2022, so the same team may be working to different editions on different projects in the same year.<\/li>
  • The fix is procedural: one envelope data source, COMcheck started at DD, re-run on every change, and checked against the reviewer’s own checklist before submittal.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Industry Overview <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    The U.S. Department of Energy issued its affirmative determination on ASHRAE Standard 90.1-2022 on March 6, 2024, and set March 6, 2026 as the deadline for states to certify. That date has passed, and adoption is still uneven. DOE’s state profiles show some states, including Delaware, Nevada, and Illinois (with amendments), on the 2024 IECC and ASHRAE 90.1-2022 for commercial work, while others remain on earlier editions. Delaware amended its regulations to adopt both in April 2026, and Sussex County will require plans submitted after December 31, 2026 to be designed to the 2024 IECC with a COMcheck or REScheck worksheet.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Enforcement is tightening in places too. Houston’s permitting office has required a COMcheck report on commercial plan reviews since 2016, and began rejecting incomplete reports at pre-screen in 2021. For a design team, that means the envelope narrative has to be complete and consistent on day one of submittal, not corrected during review.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    Problem Statement <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    Envelope compliance depends on facts that are owned by different people. The architect owns assemblies, insulation, glazing, and air barrier strategy. The MEP engineer owns the load calculations and often the energy model, both of which depend on those same assumptions. The COMcheck file sits in between, and whoever builds it is translating from drawings that may already be out of date.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    What a rejected envelope submittal actually costs<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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    eLogicTech does not have a benchmark for rejection cost and we won’t invent one. The cost chain is easy to describe, though, and every project team can price it with their own rates:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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    • A comment letter that cites mismatches between the COMcheck report and the drawings.<\/li>
    • Rework hours across sheets, schedules, and the compliance file, usually by senior staff who were already on the next project.<\/li>
    • Re-coordination with the glazing supplier, the mechanical engineer, or both, if a value changes.<\/li>
    • A resubmission cycle, with the review time and, depending on the jurisdiction, any resubmission fees that come with it.<\/li>
    • Schedule delay carried against the project: general conditions, financing, and the tenant or owner date.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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      A simple way to put a number on it internally: rework hours multiplied by blended rate, plus weeks of delay multiplied by weekly project carrying cost, plus resubmission fees. Use your own figures.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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      Challenges<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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      • COMcheck started too late. When the file is built at the end of CDs, areas get re-keyed from PDFs and assumptions get filled in to finish the report.<\/li>
      • Area takeoff errors. Gross wall area, net opaque wall, glazing, and roof or skylight areas must be consistent with the drawings. Small counting differences are enough for a reviewer to question the whole sheet.<\/li>
      • Cavity versus continuous insulation. DOE’s own training material stresses that the two are entered differently, and that the software interprets them differently. Entered wrong, the report no longer matches the wall section.<\/li>
      • Glazing values that moved. U-factor and SHGC on the schedule, the approved submittal, and the report must agree, and value engineering swaps are the usual cause of disagreement.<\/li>
      • Air barrier continuity. Reviewers look for a continuous air barrier shown at windows, doors, and transitions. If it isn’t drawn, it can’t be verified.<\/li>
      • MEP working from stale envelope values. Load calcs and energy models sized on earlier glazing or assembly assumptions will not match the envelope that goes to permit.<\/li>
      • Code edition drift. A project designed to one edition and permitted under another creates rework that has nothing to do with design quality.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        Solutions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        Treat the envelope as a managed dataset, not a drawing byproduct. One register of assemblies and glazing, owned by the architect, read by the MEP team, and used to build COMcheck. Every change goes through that register, and every change triggers a re-run.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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        Step-by-Step Process \/ Methodology<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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        • Confirm the code edition and compliance path with the jurisdiction at schematic design, including whether COMcheck or a performance path applies.<\/li>
        • Define each envelope assembly in the model with its R-values, U-factors, and SHGC as parameters, so schedules and takeoffs can be extracted rather than re-measured.<\/li>
        • Extract areas from the model: gross wall, glazing by orientation, roof, skylights, slab edge, and below-grade walls.<\/li>
        • Build COMcheck at design development and record the plan sheet or detail where each assembly is shown.<\/li>
        • Issue the same envelope values to the MEP team for load calculations and energy modeling, and require sign-off that they used them.<\/li>
        • Before submittal, trace every COMcheck line to a wall section, window schedule, or specification, using the jurisdiction’s own plan review checklist as the test.<\/li>
        • Re-run COMcheck after any glazing, insulation, or assembly change, and freeze the file when the permit set is issued.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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          Benefits<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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          • Fewer comments tied to mismatches between the report and the drawings.<\/li>
          • MEP load calculations that reflect the envelope that is actually being built.<\/li>
          • Faster internal QC, because every compliance line has a drawing reference.<\/li>
          • Change decisions made with compliance visible, rather than discovered after the fact.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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            Features \/ Key Highlights<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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            eLogicTech works as the production team behind architecture and MEP firms, so the envelope and the systems that depend on it are produced from the same coordinated model:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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            • Architectural BIM modeling in Revit up to LOD 400, with envelope assemblies built as data-carrying types<\/li>
            • MEP BIM modeling, load calculations, and energy modeling aligned to the architectural envelope<\/li>
            • Permit drawings and construction documentation with wall sections, schedules, and air barrier details cross-referenced<\/li>
            • BIM model auditing to catch inconsistencies between model data and documentation before submittal<\/li>
            • Structured QA\/QC review before any package leaves our team<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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              Best Practices<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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              • Ask the jurisdiction for its COMcheck plan review checklist at the start of the project and design to it.<\/li>
              • Put the assembly register in the project’s coordination plan, with a named owner.<\/li>
              • Add U-factor and SHGC to the window schedule and keep them there, instead of in a side spreadsheet.<\/li>
              • Require the MEP engineer to state which envelope version their load calcs used.<\/li>
              • Re-run COMcheck at each milestone issue, not only before permit.<\/li>
              • Keep a short change log for any glazing, insulation, or wall type change after DD.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                Common Mistakes to Avoid<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                • Starting COMcheck after the drawings are “done”.<\/li>
                • Using a placeholder window product in the report and never replacing it.<\/li>
                • Letting value engineering change glazing or insulation without touching the compliance file.<\/li>
                • Entering continuous insulation as cavity insulation, or the reverse.<\/li>
                • Leaving orientation on the report inconsistent with the site plan.<\/li>
                • Assuming the engineer’s energy model and the architect’s report use the same envelope.<\/li>
                • Submitting a report with blank or generic product fields in jurisdictions that screen for completeness.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                  Comparison Table: Late Workflow vs. Model-Coordinated Workflow<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                  Statistics & Industry Data<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                  • DOE issued its determination on ASHRAE 90.1-2022 on March 6, 2024, with a state certification deadline of March 6, 2026 (U.S. Department of Energy, Building Energy Codes Program).<\/li>
                  • DOE’s analysis found new commercial buildings meeting 90.1-2022 would average 9.8% site energy savings compared with the 2019 standard (as reported by ENR, March 2024).<\/li>
                  • The 2024 IECC is expected to improve commercial building efficiency by roughly 10% compared with the 2021 edition (Insulation Outlook, 2024).<\/li>
                  • Houston’s permitting office has required COMcheck on commercial plan reviews since 2016 and announced rejection of incomplete reports at pre-screen beginning in 2021 (Houston Permitting Center).<\/li>
                  • Delaware adopted the 2024 IECC and ASHRAE 90.1-2022 for commercial and high-rise residential buildings in April 2026; Sussex County requires compliance for plans submitted after December 31, 2026 (ICC-NTA, June 2026).<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                    Case Study<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                    Consider an AEC firm in Texas designing a three-story medical office building. The team prepared its COMcheck report at the end of construction documents, using the glazing product listed in an early specification. During value engineering, the owner approved a lower-cost storefront system with different U-factor and SHGC values. The window schedule was updated. The COMcheck file and the mechanical load calculations were not.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                    At plan review, the examiner compared the schedule to the report and issued a comment on the mismatch. The team re-ran COMcheck, which passed with the new product, then discovered the mechanical engineer’s cooling loads had been calculated on the original glazing. Equipment selections were rechecked and a revised set was resubmitted. A single product swap touched four documents, and only one of them was updated at the time of the change.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                    Expert Insights \/ Tips<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                    • Plan reviewers think in tracing, not in totals. Make every COMcheck line traceable to a sheet number.<\/li>
                    • When a substitution request arrives, ask two questions before approving: does it change a COMcheck input, and does it change a load calculation input.<\/li>
                    • Roof space is a coordination issue now too. Solar-ready requirements in newer editions compete with rooftop mechanical equipment for the same area, and that conversation belongs at schematic design, not at permit.<\/li>
                    • Do an internal plan review before submittal using the jurisdiction’s checklist. It is faster than a formal comment cycle.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                      Future Trends<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                      As more states certify to 90.1-2022 and the 2024 IECC, envelope requirements and related items such as on-site renewable provisions and solar-ready zones will reach more jurisdictions. DOE noted that 90.1-2022 adds, for the first time, a minimum prescriptive requirement for on-site renewable energy. The practical result for design teams is more cross-discipline dependency in the permit set, not less. Teams that treat envelope data as a shared model dataset will absorb code changes more easily than teams that rebuild compliance from drawings each time.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                      Frequently Asked Questions \u2753<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                      Q: Who should own the COMcheck file, the architect or the MEP engineer? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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                      It varies by firm and contract, but the envelope inputs belong to the architect. The important part is that the MEP engineer uses the same values and the owner of the file is named at kickoff.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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                      Q: When should COMcheck be started? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
                      \n\t\t\t\t
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                      At design development, once assemblies and glazing are defined, and then re-run at each issue. Building it only at permit stage is the most common source of mismatches.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

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                      Q: Why do reports get rejected at pre-screen in some cities? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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                      Some permitting offices screen for completeness before assigning a reviewer. Missing product information, blank fields, or absent plan references can stop a submittal before review begins.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

                      \n\t\t\t\t\n\t\t\t\t\t
                      Q: Does changing a window product really affect MEP? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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                      Yes. Glazing U-factor and SHGC feed cooling and heating load calculations, so a change in either can affect equipment sizing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t\t

                      \n\t\t\t\t\n\t\t\t\t\t
                      Q: Which code edition applies to my project? <\/div><\/span>\n\t\t\t\t\t\t\t\n\t\t\t<\/path><\/svg><\/span>\n\t\t\t<\/path><\/svg><\/span>\n\t\t<\/span>\n\n\t\t\t\t\t\t<\/summary>\n\t\t\t\t
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                      That depends on the jurisdiction and the permit date. Confirm with the building department early, and check DOE’s state code status pages for the current picture.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/details>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                      Conclusion<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                      Envelope compliance fails in the handoffs, not in the calculations. A report built late, from drawings that have moved, checked against a model nobody updated, will produce comments no matter how good the design is. The teams that get through plan review cleanly are the ones that treat envelope data as shared, versioned, and traceable, from schematic design to permit.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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                      Call-to-Action <\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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                      If your architectural and MEP packages are produced by different hands, it is worth looking at where the envelope data crosses between them. Talk to eLogicTech about a coordinated architectural and MEP production workflow built around your permit deadlines.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

                      Introduction The COMcheck report is usually the last document built in a commercial permit set, and it is often built by the…<\/p>\n","protected":false},"author":1,"featured_media":4335,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"\nBuilding Envelope Modeling and COMcheck: Where Architect-MEP Coordination Breaks Down \u2014 and What It Costs at Plan Review - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.elogictech.com\/blog\/building-envelope-modeling-and-comcheck-where-architect-mep-coordination-breaks-down-and-what-it-costs-at-plan-review\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" 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