Steel Roofing

For: Industrial, Commercial, Institutional & Agricultural & Residential

Introduction

Architectural Roofing

The architectural type steel roofing system is similar to the traditional steep-sloped roof and is primarily a visual product applied over solid sheathing. Sheet steel roofing is available in a variety of widths, cross-sections, seam types, colours and finishes. Whether for an industrial, commercial, institutional, agricultural or residential project, steel roofing can provide a beautiful aesthetic that will stand up to extreme weather conditions and last for decades.


Structural Standing Seam Roofing

Structural type steel roof systems may be compared to traditional low slope roof membrane systems because they are designed to carry roof loads, resist moisture infiltration on low-slope applications, and can be installed without a solid sheathing substrate. The term "standing seam" is used to refer to many kinds of roofing panels that have a raised vertical seam, which ensures that the panel seams are above the water level. The standing seam can also be used as an architectural element to highlight the roof aesthetics and accent the building's architecture.

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Product Specification

Standard for Industrial, Commercial and Institutional Market

The CSSBI 20M Standard for Sheet Steel Cladding for Industrial, Commercial and Institutional Building Applications is intended to assist specifiers, designers, buyers, manufacturers, and erectors of architectural sheet steel roofing by providing information which can be adopted by reference where desired. The requirements provided include recommended minimum requirements for such factors as grade of steel, thickness, metallic coating designation, loading and deflections, as well as design, fabrication and erection in general. Currently the CSSBI does not have a standard specifically for the structural standing seam roof panels.

Standard for Agricultural Market

The CSSBI 21M Standard for Steel Farm Roofing and Siding is intended to assist, buyers, manufacturers, and installers of sheet steel farm roofing and siding by providing information that can be adopted by reference where desired. The requirements provided include recommended minimum requirements for such factors as grade of steel, thickness, metallic coating designation, loading and deflections, as well as design, fabrication and erection in general.

Paint Specification

The CSSBI S8 publication Quality and Performance Specification for Prefinished Sheet Steel Used for Building Products applies to hot dipped metallic coated sheet steel prefinished with colours of proven durability and suitable for exterior exposure as delivered from the coil coater. Specific requirements are included that cover the base steel, metallic coating, paint qualification tests, exterior exposure (weathering), accelerated corrosion tests, and colour match. This specification can be adopted by reference and sets a minimum level of performance for prefinished sheet steel building products.

Thermal Performance

UPDATE (April 26, 2016) - Our work in the area of thermal performance done with Morrison Hershfield has been incorporated into and published in the latest edition of the Building envelope thermal bridging guide from BC Hydro.

With the introduction of updated energy codes and standards, such as the Canadian National Energy Code for Buildings (NECB 2011), provincial jurisdictions are enacting more stringent requirements on the thermal transmittance of the building envelope.

We engaged Morrison Hershfield to evaluate the thermal performance of high performance of several insulated sheet steel roof and wall assemblies. The objective of this project was to identify sheet steel wall and roof assemblies that will comply with current Canadian codes and standards related to energy efficiency and to provide guidance to viable approaches that could improve thermal performance for sheet steel assemblies.

Using 3D heat transfer modelling, the effective R- and U-values for several wall and roof sheet steel assemblies were found using common components for metal buildings. These were compared to energy requirements in NECB 2011. Material changes to these structural attachments, including steel thicknesses and thermal break placements, were also analyzed in order to determine their impact on the heat transmittance through the assemblies.

Results from this research can be found in our summary document CSSBI B20: Thermal Transmittance of Insulated Sheet Steel Wall and Roof Assemblies or click to view the entire report from Morrison Hershfield.