How roof loadings impact your roof structure

A new roofing system has specific structural loads that can be placed on a building. The two types of loads that are most commonly referred to in the roofing industry are as follows:

1.       Dead loads:

This can be defined as ‘any permanent load that is applied to a roof truss’. Examples include:

  • Self-weight of the roof trusses
  • Solar panels
  • Geyser
  • Purlins (additional bracing and timber)
  • Ceilings
  • Roof covering
  • Sheathing

Additional loads such as geyser, solar panels and roof ducting, etc.

2.       Live loads:

This can be described as ‘any non-permanent or temporary loads applied to a roof truss’. Examples include:

  • Foot traffic (such as people walking on the roof)
  • Structural repair equipment
  • Natural elements (such as rain, snow and wind)

Additional loads such as geyser, solar panels and roof ducting etc.

In the planning process of a roofing system, the following questions need to be considered:

  • Firstly: Ask yourself what type of roof covering you want and;
  • Secondly: As the customer, what will best meet your needs?

It is also important to bear in mind that roof coverings have different shapes, sizes and weights. For example, standard roof covering loadings are categorised as follows:

  • Concrete roof tiles: Weights between 46kg – 56kg per square metre
  • Metal iron sheeting: Weights between 3.7kg – 6.3kg per square metre

Please note: These different loadings will have an effect on the design and price of the roof covering.

For more information, feel free to contact LCP Roofing for additional advice on roof loadings or any other aspects related to roofing systems. We are happy to assist and be of service to you. Visit our website www.lcproofing.co.za for more information.

Article by Peerie Groenewald, LCP Roofing Designer.

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