Page 41 - Realm Catalog

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Fasteners cost less than 1-2% of the total cost of the building. Yet this is
the weakest link that connects the Metal Roof to the secondary substrates.

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DECISION ANALYSIS

Fasteners are critical components of a building. engineers need to be able to depend on the durability,
Choosing the right fastening system can prove decisive quality and performance of the fasteners that secure the
in terms of the longevity and safety of the roof. Through roof; fastener selection has evolved into one of the most
this brochure, REALM gives you a clear guide to the most crucial aspects of the building design.
suitable fasteners for different roofing application.
That is why expert judgement is required to choose
Specifying the right fasteners, for the right application fasteners that:
is critical, because inadequate fasteners can cause • Perform as intended
major defects in a project, including replacement of • Are dependable and economical
roofs, water leakage, damage to machinery and other • Last equal to or more than the life span of the building.
construction related issues.
Factors effecting fastener performance include:
Since standard types and grades of fasteners are • Structural capacity and safety factor.
adequate in many construction application; fastener • State and dynamic load resistance.
selection is usually based on industry standards, • Pull-out and pull-over resistance.
building code requirements and design loads. In some • Shear resistance of fastener and attached materials.
cases, it is deemed feasible to leave the fastener • Corrosion resistance in conditions of use.
selection to the discretion of contractors or building • Long term seal guarantee.
product fabricators, allowing them to select fasteners • Seal against liquid or gas leakage (if required).
based on cost, convenience and trade practices. • Constructibility, practicality and inspect ability.
• Compatibility with design intent and aesthetics
However, with the emphasis now on long term • Removability or other special requirements.
performance of a roof and because builders and • Service life exceeds that of attached materials.