MEP PE Stamp in Collin County, TX: What Gets Reviewed Before Sealing?

The mechanical review starts with the load calculations, because every downstream decision inherits their assumptions. I check that the calculations used realistic North Texas outdoor design conditions, with internal gains modeled honestly for the occupancy and the latent load broken out and visible rather than buried in a total. Equipment selection gets matched against both sensible and latent capacity, and I look hard at the ventilation strategy: code-required outside air in a humid climate is a dehumidification load that has to be in the equipment capacity, not just a duct connection. The county's building mix — corporate offices, healthcare, retail, multifamily — each brings its own internal-gain profile, and the review checks that the loads reflect the actual occupancy rather than a template. Controls sequencing gets reviewed too, because the best-sized equipment underperforms with poor sequencing. The sealed drawings should show the mechanical system as a designed whole: loads, equipment, distribution, and controls all telling the same story.

City and county reviewers in Collin County read the MEP set the way a contractor builds from it: does the logic hold together? Riser diagrams get checked against the floor plans — every fixture tracing to the riser, with pipe sizing, slopes, and venting that satisfy the plumbing code. Panel schedules get checked against the electrical riser: calculated loads, breaker sizes, and feeder sizes in agreement, with the service calculation supporting the building. Fixture counts get checked against occupancy, specialty systems get checked against their code chapters, and energy compliance documentation gets checked against the drawings. The PE's pre-seal review runs this same gauntlet, which is the point of review-and-seal: corrections from your own engineer are fixed in days, corrections from the AHJ cost a review cycle. I also verify the MEP layouts against the structural backgrounds, because the most expensive field problems are beams that clash with ductwork nobody checked before the seal.

An MEP package is ready for the PE's review — and then for the AHJ — when these items are resolved. Correct equipment sizing for Texas heat is the centerpiece. • AHJ confirmed by current parcel verification: city building department vs Collin County permitting • Texas-licensed PE in responsible charge under TBPELS Rule 137.33; firm's F-number on the seal block • HVAC load calculations with realistic North Texas conditions and latent loads broken out • Equipment schedules matching the plans, with sensible and latent capacity verified • Plumbing risers, fixture counts, and electrical panels/riser fully coordinated • Energy compliance documentation reconciled against the actual sealed design • MEP layouts coordinated with structural framing to catch clashes before plan check does