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McElroy's 2 3/4" tall symmetrical Trap-Tee system is a mechanically seamed system designed to resolve the three major shortcomings of trapezoidal standing seam roof systems: leaking endlaps, low wind uplift capacity, and repair challenges.

Site forming eliminates end laps that tend to leak over time. Oversized seams and special clips dramatically increase wind uplift capacity, and the symmetrical design allows for easy repair or alteration after the roof is installed. With a life expectancy approaching 60 years, the ability to add curbs, vents, single panel replacement, and even building additions represents a critical component.

McElroy's standard paint system for Trap-Tee is Kynar 500® (PVDF), the industry's best coating for long-term protection against panel chalk and fade. For budget-conscious or low-sloped applications, this panel is also available in acrylic-coated Galvalume®

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Trap-Tee Advantages Include:

  • Ease of installation
  • Individual panel replaceability
  • Watertight seam design
  • Outstanding wind uplift
  • 1/4:12 minimum roof slope
  • Single-piece panels up to 250' long
  • No lap conditions = improved weathertightness
  • Bi-directional seamer
  • Ideal for: new construction; remove and replace; and recover for open frame buildings

Specifications & Details

Profile 2 3/4" Mechanically Seamed
Manufacturing Facililties Houston, TX
Seam Cap Seam cap includes 2 beads of continuous factory-applied sealant
Minimum slope 1/4:12
Installation Can be installed over a solid deck or open framing
Suitability Best suited for simple sloped roofs without dormers, hips, valleys or other special conditions.
Note Oil Canning is a natural occurrence in metal panels and is not a cause for panel rejection
Uplift Test ASTM E1592
Air Infiltration ASTM E1680
Water Infiltration ASTM E1646
Testing Data For any available Test Data, Section Properties, or Load Tables, please visit our downloads section
Panel Info
Panel Width 18" Factory Produced-40' Maximum Length
18" & 24" Site Formed
Panel configurations Minor Ribs
Coating Acrylic Coated Galvalume®
Kynar 500® (PVDF)
Substrate Standard 24 GA Galvalume®
Optional 22 GA & 20 GA Galvalume®

Related Products






R-Seal’s continuous insulation system reduces heat transfer through the building's framing. Traditional insulation systems allow more heat to be conducted through the building's framing.


Continuous Insulation System R-Seal Advantages

  • R-Seal is designed to be installed on top of open frame metal buildings with purlins spaced 5’ O.C.
  • Rigid urethane board with shiplap side joints and waterproof facer
  • Tape seal flap makes a watertight joint between boards
  • Continuous R-Value of 7.5 per inch (no break over purlins)
  • 42” wide board x up to 53’ long for super fast installation
  • With R-30 (4”) YOU CAN WALK ON IT!
  • Air-tight and water-tight after installation
  • Trades go right to work after installation in the building compressing the construction schedule
  • Ideal for new construction or removing and replacing a standing seam
  • Paintable

Related Files


PDF Drawings

Product Data Sheets

Product & Trim Information Books

English Installation Manuals

Technical Bulletins / UL 580 Construction Numbers

Technical Bulletins / Miscellaneous Testing

Technical Bulletins / Miscellaneous Testing

Technical Bulletins / Miscellaneous Information

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Trap Tee
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Customize your submittal package Trap Tee

Click on your desired documents below to select them for your package.

General Product and Warranty Information

Panel Load Tables w/Section Properties and Testing


Samples & Color Charts

Request physical samples and color charts. All items will be sent out via UPS ground unless otherwise specified.

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Weathertightness Warranties
Weathertightness Warranties

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Download Shop Drawings

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Whether you’re building a new home or planning renovations, a metal roof can deliver long-term cost savings and comfort. To explore your options and find the product that meets your aesthetic and budgetary needs, contact a McElroy Metal distributor or contractor in your area today. We can’t wait to help make your dream home a reality.

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