Rank: Forum user 
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Is there any legal requirement on designing scaffolds (independant tied) by a third party, for scaffolds higher than 10 meters?
Regards,
P
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Rank: Forum user
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P
As far as I understand there is nothing that states a cut off point, say 10 metres, over which scaffolds must be designed ( I could be wrong). Therefore to answer your question fully I would be asking for more information on the scaffold.
To paraphrase the HSE's own publication (3 pages) Construction-Scaffolding-Scaffold Checklist, unless a scaffold is a basic configuration described in recognised guidance e.g. NASC TG20 or manufacturer's guidance for system scaffold (e.g. user guide / erection manual) the scaffold should be designed. (The word 'should' is taken streight out of the HSE publication).
Clearly then to answer your question we would need to know if the structure configuration will be detailled within TG20 or the USer Guide. This is not clear from the info given.
The HSE document goes on to produce a list of scaffold structures that need to be disigned (note the word should is no longer used). This includes dead/ flying shores, cantilevered scaffolds, access birdcages, facade retentions, support scaffolds, loading bays founded on the ground, bridge scaffolds, suspended scaffolds, fans and so on.
The list goes on to include access scaffolds with more than 2 working lifts allowed within TG20, buttressed free-standing scaffolds, and system scaffolds outside users guide parameters all three of which could be the configuration of the scaffold you refer to.
Not sure if you are asking this in realtion to a specific scaffold or to clarify a point, however regardless of which it is worth reading through the referred to HSE publication and if erected by others discussing with the scaffold provider.
Hope this helps, and sorry if its not a simple yes or no answer.
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Rank: Super forum user
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Remember also that a designer of a scaffold is not the person erecting it. Any design should be drawn out and signed off by the designer together with duty and design criteria annotations. From memory TG20 places most 10m scaffolds in the designed category.
Bob
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Rank: Super forum user
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if the answer is 'no', then is the scaffold structure not classed as a temp design, and would need to be designed?????
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Rank: Forum user
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To be a bit more precise in terms of your original question:
Assuming we are dealing with a scaffold in the UK, the legal requirement is given by regulation 8(b)(ii) of the Work at Height Regulations 2005; this requires all scaffolds supporting a working platform to comply with Part 2 of Schedule 3 of the WAHR. That schedule requires there to be "strength and stability calculations" [i.e. a design] for all scaffolds unless they are assembled in accordance with a generally recognised standard; that's where NASC TG20 comes in for "Basic Scaffolds" or the manufacturers guidance for system scaffolds.
The design does not HAVE to be by a third party [but obviously the designer must be competent and the design adequate].
There is a whole list of features that have to be complied with for a scaffold to be a "Basic" scaffold within TG20; maximum height is only one. The maximum height depends on the load class of the scaffold, whether it is sheeted, netted or not, and the calculated 'wind factor'. Most scaffolds of 10m would be below the max height even if sheeted. But you still need to check, and check it meets all the other features as well.
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