single lock standing seam

Double lock standing seam


DELTA Membrane is required for all roofing applications.

Please contact VMZINC-US with any questions or concerns.

What is Double lock standing seam?

The Double lock standing seam system used on roofing applications enables long strips of VMZINC to be assembled by forming single or double folds on the up-stands.


A traditional technique applied to roofs. This technique can be machine or hand produced. It reflects the individual architect’s concerns for lines and shadows, producing designs that have a historical perspective.


The low height of the seams 1” (25 mm) and 1 1/2” (38 mm) contributes to the lightness and regularity of the roofing in its architectural function, particularly when used on more complex shapes, giving them a distinctive “high-tech” appearance.


Due to the use of profiling and seaming machines for closing the longitudinal standing seam joints, the installation time is greatly reduced, making this a cost-effective solution, particularly for very large roof surfaces.


This technique utilizes less metal in comparison with the batten (roll cap) method.


For warm roof application solutions, please contact your VMZINC Representative.


Surface colors: QUARTZ-ZINC / ANTHRA-ZINC / Natural Zinc by VMZINC 

Thickness 0.7mm, 0.8mm
Panel Maximum Dimensions 48’-0"
On Center for 1" panel  16 7/8"
Seam 1" and 1.5"
Radius for 1" panel Convex R1 48" pre-fab
Concave R1 130' field 

Convex R1 30' field
Concave R1 130' field

Convex R2 10’ field
Concave R2 10’ field
Coverage 1.4 ft2 per installed
Weight  1.17-1.20 lb per ft2 installed

40 QUARTZ-ZINC/ANTHRA-ZINC panels per crate

Minimum Pitch for warm roof


Minimum Pitch for cold roof

1:12 to 2:12 are required to use           VM Delta Membrane


Characteristics of this technique:

  • Suitable for roofing applications
  • Utilizes light gauge (0.7 mm) zinc panels
  • Requires a solid substrate and a suitable underlay material
  • Can go as low as 1:12 slope with proper detailing
  • UL Rated-up to 225 PSF uplift*

* Depending on assembly and fasteners.



Key Advantages:
Technicité Versatile metal roof system with a traditional look
Discrete Vertical, horizontal and diagonal installation
Technicité Concealed clips and fasteners
Simplicité de pose Easy to install
Economique Economical


  • This system is particularly suitable for very large roof surfaces and for structures located in regions of harsh climate, which are often subject to snowfall (mountainous or continental climate), strong winds, and heavy rain. VMZINC has a theoretical thermal expansion coefficient of 1/64”/ft for 212°F temperature change (2.2 mm/m for 100°C change). In addition, it offers very good wind resistance in extremely windy areas. It is possible to modify the number of fixing clips required according to the prevailing climatic conditions.
  • Coverage: plus or minus 1/16” (1.6 mm)
  • Flatness at maximum deflection: 5/64” on 36” (2 mm on 914 mm)
  • Curvature: 1/32” (0.8mm)
  • Roof pitch 1:12 to 2:12 are required to use a VM Delta Membrane

Examine substrates, areas, and conditions for compliance with requirements for installation tolerances, metal wall panel supports, and other conditions affecting performance of work.


Verify that substrate is plumb, sound, dry, smooth, clean, sloped for drainage, and completely anchored, and that provision has been made for wall drains, flashings, and penetrations through metal wall panels.

Examine primary and secondary wall framing to verify wherther or not purlins, angles, channels, and other structural panel support members and anchorages have been installed correctly.
4 Prepare written report, listing conditions detrimental to performance of work of this section. Submit copy of report to architect.

Examine roughing-in for components and systems penetrating metal wall panels to verify actual locations of penetrations relative to seam locations of metal wall panels before wall panel installation.

6 Install metal wall panels in orientation, sizes, and locations as indicated on the drawings.
7 Install metal wall panels plumb, level, square, true to line, and within installation tolerances.
8 Install metal wall panels perpendicular to girts and subgirts, unless otherwise indicated.
Anchor metal wall panels and other components of the work securely in place, with provisions for thermal and structural movement. Do not use a torch to field-cut metal wall panels.
Fasten metal wall panels in accordance with manufacturer’s instructions. Panels to be installed on vertical lines 28cm on center. Flash and seal metal wall panels with weather closure edges and at the perimeters of openings.
Install flashing and trim as metal wall panel work proceeds. Fasten flashings and trim around openings and similar elements.
Maintain metal wall panels in clean condition during installation. Remove protective film within 90 days of installation.

UBP USA Inc. recommends the S-5-E Mini clamps for the attachment of photovoltaic panels, and S-5-E for snow retention systems on UBP standing seam panels. For more information please go to


*Please contact Umicore Building Products for 1" Alpine Roof and 1.5" Double Lock Standing Seam Roof Details.


For more information, please contact VMZINC.