NASC has launched a new TG4 User Guide and poster to support the safe installation and testing of scaffold anchor ties.
The two documents sit alongside TG4:25 Anchorage Systems for Scaffolding, which was issued in 2025 and sets out technical guidance on tie loads, anchor selection, proof testing and related work.
The new additions are aimed at bringing that information closer to the people responsible for ties on site, including scaffolders, supervisors and project teams.
James Attridge, chair of the NASC Technical Committee, said scaffold ties were central to the stability of many structures.
“Façade access and other scaffolding configurations are typically tall and narrow and therefore rely on secure attachment to a permanent building or structure to maintain stability,” he said.
“To achieve this, anchors are often installed into existing masonry or concrete structures to provide an effective means of tying.”
Pocket guide for scaffolders
The TG4 User Guide is an A6 booklet aimed at scaffolders who install and test drilled and cast-in anchors.
It covers the main factors involved in fixing anchors, including the checks and precautions needed to protect their integrity. NASC said it was designed as a pocket reference for those carrying out the work.
TG4:25 remains the main technical document. It covers the selection, installation and management of scaffolding anchorage systems, including preliminary testing where the suitability of an anchor in a base material is uncertain.
It also sets out proof-testing requirements. NASC says a sample of anchors must be tested on each project, with at least 5% selected at random and a minimum of 3 anchors tested in each separate area.
Poster for site awareness
An A2 TG4 poster has also been issued for use on site.
It states that anchor ties are needed to maintain scaffold stability and prevent structural failure or collapse. A QR code directs users to further NASC information.
The release reflects a familiar site risk. Anchor ties can appear routine, but errors in anchor selection, drilling, installation or testing can affect the stability of the whole scaffold.
The new documents are available through the NASC website.
