Standard (modular upright)

The vertical tube of a modular scaffold with a connection disc every 0.50 m; it carries all vertical loads and takes every ledger, brace and bracket.

Also called: upright, vertical standard, ringlock standard, modular post, vertical

A modular scaffold has no ready-made frames. Single vertical tubes – the standards – stand at the corners of each bay, and everything else is fixed to them: ledgers, diagonals, brackets, guard rails. The standard collects all vertical loads and passes them through the base collar and the base jack into the ground.

Because standards are not tied to a fixed frame dimension, they can wrap round tanks, stairwells, process plant or stages. That freedom is why modular scaffolding dominates industrial and special work.

Design and lengths

A standard is a 48.3 mm steel tube, hot-dip galvanised, with discs welded on at 0.50 m centres. Ledgers and braces lock onto these rosettes or perforated discs with wedge heads. Wall thickness and steel grade vary between manufacturers.

Lengths: from 0.50 m up to 3.00 m in half-metre steps, plus 4.00 m.
With spigot: a connector pressed or welded into the top end receives the next standard – the normal version.
Without spigot: for the top of the scaffold, guard rail posts or special builds that need a plain tube end.
Special standards: for example with closer disc spacing near the base, or with a detachable spigot for suspended scaffolds.

Erection in brief

First build the base: sole board, jack and base collar, joined by ledgers into a level rectangle. Then slide the standards onto the collars. A proven trick is shorter standards inside and longer ones outside – 2.00 m inside and 3.00 m outside, say. The joints are then staggered and the outside already has a post for the next guard rail. Wedges are driven home with a 500 g hammer until the blow rebounds. Plumb each standard before decking; one that leans is hard to correct later. Where uplift is possible, as on mobile towers or suspended scaffolds, the joints are secured with bolts or spring pins.

Checking used standards

Look along the tube – it must be perfectly straight.
Discs must not be bent or torn; holes must not be worn oval or filled with concrete.
The spigot has to sit tight. A loose one disqualifies the standard from structural use.
Water collects at the foot of tubes that do not drain: watch for inside rust and tube ends split by frost.
Check the manufacturer marking, clean galvanising and sound welds at the discs.

Typical mistakes

Mixing standards of different systems because diameter and disc spacing look identical is the classic error; only the documentation of one system applies. Starting with equal lengths inside and outside puts every joint at the same level.

Frame or standard? On a straight facade frames go up faster because fewer parts move. As soon as the geometry turns awkward, heights jump or heavy loads sit on small areas, the standard shows its strengths – which is why many firms keep both. Used standards from ring systems such as Layher Allround or PERI UP are listed under standards.

Frequently asked questions

What lengths do modular standards come in?

Usually from 0.50 m to 4.00 m, mostly in 0.50 m steps. A disc for connections sits every 0.50 m.

Why are the joints of standards staggered?

Staggered joints make the scaffold stiffer and speed up erection, because a standard for the next guard rail is already in place outside. Crews therefore often start with shorter standards inside and longer ones outside.

Do standards have to be secured against lifting?

On ordinary facade scaffolds usually not; on mobile towers, suspended scaffolds or hung structures they do. The manufacturer's instructions state where.