Metal roof installation | Building Design + Construction

The installation techniques for metal roofs vary greatly depending on the fastening system chosen. With single-skinned roofs, there are three different fastening systems to consider: hidden, exposed and standing seam.

Installation of the standing seam metal roof panel

Standing seam metal roof panels are attached to the sub-floor with concealed mechanical clips, which are available in various spacing heights. These clips offer space for different insulation thicknesses depending on the clip height. The design of most clips allows the roof panel to expand or contract regardless of the substrate. This function contributes to the durability and longevity of the panels as they can adapt to the thermal movement of large roof areas. These panels are ideal for use in the following industries: heavy commercial, industrial, architectural and some residential applications.

Standing seam panels can be installed over solid surfaces or open frames. During the installation process, it is important to pay close attention to the correct orientation and engagement of the panel, as well as the squareness and modularity of the installation of the substrate. This ensures that the panel seams are done properly via Snap Lok or Mechanical Seaming. Depending on the panel profile, each seam method includes the panel clip in the panel seam, which means that the roof system can be expanded and reduced. All side cover sealants are installed at the factory. Most pitch applications are ¼: 12 and ½: 12, but some require 3:12 or more depending on the profile and seam type.

Concealed installation of the attached metal roof panel

In the case of concealed metal roof systems for fasteners, the fasteners are fastened and covered either by a snap-on side cover or – in some cases – by a snap-on lath cap. These panels are typically 16 inches or less wide and are used on roofs with a slope of 3:12 or more. They are ideal for use in the commercial, architectural and private industries, where they can be installed over conventional or wood-framed substructures.

Concealed fixed roof panels can be installed directly over solid surfaces with a waterproof membrane. They require a minimal number of fasteners per sidewall or clip. No special tools are required to snap laps or engage the slats of the panel.

Exposed metal roof fastening from MBCI

Installation of the exposed attached metal roof panel

Exposed fastened panels are attached to the substrate with exposed, continuous fasteners that include washers for weatherproofing. This roof system is ideal for use in commercial, industrial, agricultural and residential industries due to its low cost, ease of installation and the wide variety of profiles for light applications.

Exposed attached panels are installed over solid surfaces or open frames with lots of exposed screws. Proper alignment and engagement of the fasteners is ensured by on-site systems. The spacing of these screws is determined by the type of substrate and project design loads (up to 12 inches in the center with patterns) and location on the roof (e.g. eaves, rake, or ridge). The side deck sealants are applied on site to all profiles and the roof pitch applications can vary from a minimum slope of ½: 12 to 1:12 depending on product profile requirements.

For more information on installing these roof systems, see our detailed installation materials. If you have further questions about the installation of metal roofs, you are also welcome to contact our competent team.

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