The Sycamore at Mallow Run | Bargersville, Indiana  |  Demerly Architects  |  Horning Roofing & Sheet Metal

Inter-Lock IL20

Inter-Lock IL20 is a structural panel that is snapped together during installation. The panel is an integral interlocking system by design that installs in one direction from a given starting point. A double male starter panel is available (for a minimal setup fee) and may be installed in the middle of a roof area to achieve a symmetrical layout. Inter-Lock is a very flexible panel that works well with a wide range of building designs.

DynaClad® 70% Full Strength PVDF Paint Finish

Choice of over 32 Colors





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Roof Assemblies

Inter-Lock IL20 can be applied over various roof assemblies including:

  • rigid insulation (utilizing a bearing plate under each panel clip spaced 48″ o.c., max.) over 22 ga. corrugated metal deck
  • plywood sheathing
  • nail base insulation
  • steel deck
  • various other solid substrates

Uses & Applications

Product uses include roofs with slopes as low as 3:12, vertical fascia, equipment screens, mansards, and wall panels. This system may also be
installed on tapered roof areas.

*Note: Metallic paint finishes are “directional” and are not recommended for “double male” panels.

Product Offerings

24 ga., 22 ga. Steel, and .032, .040 Aluminum
Embossing and various stiffener configurations available

  • IL2012 with 12” o.c. seams
  • IL2016 with 16” o.c. seams
  • IL2018 with 18″ o.c. seams

16, 20 oz. Copper
Various stiffener configurations available

  • IL2012 with 12″ o.c. seams
  • IL2018 with 18” o.c. seams

Performance Tested

  • UL-580 Wind Uplift
  • ASTM E1592 Uniform Static Air Pressure
  • ASTM E331 Water Penetration
  • ASTM E283 Air Leakage


  • Optional Factory Applied Non-Curing Sealant: For superior watertightness
  • Engineered Snap-Together Design for easy installation
  • Symmetrical Visual Aesthetics: Providing a non-directional appearance
  • Clip allows for unlimited thermal expansion and contraction
  • Continuous Interlocking Seam: No seam disengagement
  • Anti-Siphoning Seam Design: Prevents water infiltration
  • Continuous Rollformed Lengths: Eliminates need for panel lap joints.
  • Total System Warranties Available: For total confidence

AIA Continuing Education

DMI is committed to providing you with high-quality expert-level education in accordance with the AIA/CES standards. The courses we offer are designed to meet the needs of architects and typically run one hour in length. All Attendees will earn 1 Learning Unit. Some of the courses offered will meet the Health, Safety, and Welfare (HSW) requirements as well as the Green Building Certification Institute (GBCI) credits.

information on available courses

Our Warranties are Second to None

DMI total system warranties protect all aspects of your metal envelope system, whether that be the watertightness of the roof or siding, the Galvalume ® steel, or the durable PVDF KYNAR® finish. When looking at warranties for your system, it is important to note that not all warranties are created equal. DMI warranties ensure the watertightness of all flashing conditions, trims, curbs, valleys, and penetrations. Building owners are protected with a total system warranty - “from the deck up” when using DMI insulation, fasteners, and underlayment. Our warranties are backed-up by a full-service Engineering Department, generating project specific shop drawings. Quality control is monitored by a minimum of two on-site inspections by our Field Technical Inspectors. DMI Total System Warranties give building owners and design professionals confidence that they are receiving the highest quality and most complete warranty available in the industry.

Browse Our Warranties