- What is TG20:21?
- The NASC (UK) technical guidance defining pre-engineered compliant tube-and-fitting scaffold configurations. If your scaffold fits a TG20 compliance sheet, no bespoke design is required.
- Do I need a design for a domestic scaffold?
- Only if it falls outside TG20 compliance (over 24 m, sheeted, cantilevered, loading bay, or bridging). Otherwise a TG20 compliance sheet + weekly inspection is enough.
- What is 'basic scaffold' vs 'design'?
- Basic = TG20/SG4 compliant standard configuration. Design = calculated by a chartered structural engineer, required for special duty loads (Class 5-6), sheeting, or non-standard geometry.
- What does the Scaffolding Compliance & Load Estimator (EN 12811 / TG20) do?
- Classify a scaffold to EN 12811-1 load class, check working platform capacity and produce a NASC TG20:21 compliance summary before erection. How-to: enter bay length, number of working lifts, and select the intended use. EN 12811-1 defines six load classes: Class 1 (0.75 kN/m² — inspection), Class 2 (1.5 — light trades), Class 3 (2.0 — general), Class 4 (3.0 — masonry), Class 5 (4.5 — heavy masonry), Class 6 (6.0 — heavy stockpiling). Platform load = bay area × class UDL. TG20:21 defines compliant configurations up to 4 boards wide, ≤ 24 m free-standing height with ties every 4 m vertical × 4.5 m horizontal.
- Is the Scaffolding Compliance & Load Estimator (EN 12811 / TG20) free to use?
- Yes. Every calculator on Calcurly.com is free, works in your browser without sign-up, and can be embedded on your own website.
- How accurate is the Scaffolding Compliance & Load Estimator (EN 12811 / TG20)?
- Results are calculated in real time using industry-standard formulas. Treat the output as a well-informed estimate — always cross-check with local regulations, product datasheets, or a qualified scaffolding professional before committing to a purchase or a job.
- What inputs does the Scaffolding Compliance & Load Estimator (EN 12811 / TG20) need?
- Enter values for: Bay length (m), Platform width (boards), Working lifts (simultaneous), Total scaffold height (m), EN 12811 load class, Sheeted / netted?. Sensible defaults are pre-filled where possible so you can start with a single change.
- Can I embed the Scaffolding Compliance & Load Estimator (EN 12811 / TG20) on my own website?
- Yes — copy the iframe snippet at the bottom of this page, or use the Embed Generator to customise the size. The embedded version stays in sync with the live calculator on Calcurly.com.
