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Wind Advice Refresh

Wind management refresher what to do when high winds are forecast

With Storm Freya and Storm Garth passing, we thought it timely to have a look at wind management for marquee operators running Custom Covers marquees. If high winds are forecast it is essential that if you have marquees up that you have a wind management plan.

A good place to start is with the wind management extract from Temporary Demountable Structures published by the Institute of Structural Engineers (4th Edition). The operational maximum gust speed should be taken as a three second gust measured 10m above ground level

Two levels of warning are suggested;
Level 1; When wind monitoring registers a gust wind speed in excess of 75% operational maximum gust speed in conjunction with an increasing general trend of recorded wind speed. Staff to be put on alert that action may be required. If erection in progress consideration to be taken whether to delay erection.
Level 2; When wind monitoring registers a gust wind speed in excess of 90% of operation maximum gust speed in conjunction with an increasing trend in wind speed the operational management plan should be implemented and the site secured against access by the public. The full extract can be read by clicking here.

The structural specifications for all our marquees are set out in Appendix D of our Marquee Installation handbook and the installation manual for our curved roof structures which you can access see below.

So armed with the structural wind load of our marquees and checking the forecast, if the wind is 75% of the maximum structural load you need to start to action your wind management plan.

What to do specifically: our technical guide "how to stop your marquee blowing away" details specific steps you should take: you can access this guide by clicking the link below.

Key to the management of safe erection and maintenance of marquees in high winds is the correct installation, bracing and anchoring of the structure. Specifically, the bracing requirements of Custom Covers marquees are detailed in Appendix D of our Marquee Installation handbook and the installation manual for our curved roof structures which you can access see below. Anchoring requirements for Custom Covers marquees are detailed in the same place.

To summarise: Custom Covers marquees are all wind loaded to European temporary structures safety standard and follow existing British guidance. Our technical guides referred to above with links that you can assess below are designed to help with the following:

  • The design wind speeds of our structures
  • Risk assessments and monitoring of conditions
  • What to do if wind speeds exceed the design speed of structure
  • Table showing Custom Covers hold down forces in weight per leg required for un-staked marquee frames under varying wind speeds
  • Correct installation, bracing and anchoring requirements to achieve structural wind loads

 

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For the official MUTA guidance on the subject refer to the Mutamarq best practice guide "Safe use and operation of temporary demountable fabric structures"

If you have any questions regarding wind and your marquee, don't hesitate to give us a call on 02380 335 744

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