The site address is populated automatically from Google Maps services once the site location has been established on the map. This address can be manually overwritten if required, however, please note that the location of the site on the map will not change.

Select this option to reduce the wind exposure by considering the sheltering effects of nearby buildings. The sheltering effect is only applicable to wind sectors that are calculated as being within town terrain.

Select if the structure is a temporary structure (≤ 2 years) or if it is a long- standing/permanent structure.

Select the spring and summer option to reduce the wind exposure for scaffolds or temporary structures standing only between April and September. This option is applicable only if the design life is set as ≤ 2 years.

The maximum permitted loading on the scaffold in accordance with TG20:21 Operational Guide section 6.3:

Inside boards will be loaded to a maximum of 0.75 kN/m² in accordance with TG20:21 Operational Guide section 6.3.

Further commentary is provided in TG20:21 Operational Guide section 19.3.

The length of the scaffold elevation to be considered for the calculation.

This should be a multiple of the maximum bay length if you do not want the bay lengths to be averaged to fit within the elevation.

The maximum bay length for the scaffolding in accordance with TG20:21 Operational Guide section 6.2.

A maximum bay length of 2.0 m is typical for TG20 compliant independent scaffolding, except for load class 4 where a maximum bay length of 1.8 m is permitted.

Independent scaffolding of load class 1 – 2 may have a maximum 2.4 m bay length where the following criteria are met:

The vertical distance between the ground level and the base of the scaffold, in metres, for use when the scaffold is supported on a building or other structure.

This value should be zero if the scaffold is founded on the ground, as the elevation level of the ground is calculated automatically by the software.

The maximum scaffold lift height, in accordance with section 6.5 of the TG20:21 Operational Guide.

Lift heights of up to 1.5 m may be used for raising brickwork and similar works, as introduced in the September 2026 edition of TG20. TG20 considers that such scaffolding will be boarded or have ladder landings at alternate lifts, so a maximum of 50% of the lifts may be boarded or provide ladder landings.

If the lift height is changed to 1.5 m or less, a fully boarded scaffold is changed to alternate lifts boarded, and ladder landings at every unboarded lift are changed to alternate unboarded lifts.

The maximum width of the scaffold platform in boards, in accordance with section 6.4 of the TG20:21 Operational Guide.

The maximum number of inside boards, in accordance with section 6.4 of the TG20:21 Operational Guide.

Specifies which of the scaffold lifts are boarded: the top lift only, the top two lifts, the top lift and the alternate lifts below it, or every lift.

The Top lifts boarded (other) option allows the numbers of boarded and unboarded lifts to be entered, with the lifts boarded from the top lift downward. Otherwise, the total number of lifts is entered.

The total number of scaffold lifts, whether boarded or unboarded.

The maximum number of boarded lifts.

The maximum number of lifts that are not boarded.

Specifies whether ladder landing platforms will be provided at unboarded lifts, as described in TG20:21 Operational Guide section 8.6.

Select from:

Alternate unboarded lifts is available where two or more unboarded lifts are in succession.

Select from:

All references are to the TG20:21 Operational Guide.

Internal edge protection provided at the boarded/unboarded lifts, if required, as specified in section 6.20 of the TG20:21 Operational Guide.

The edge protection provided at the top lift.

Specifies whether to provide inner toe boards at the boarded lifts (section 6.20 of the TG20:21 Operational Guide).

The tube material from which the scaffold will be constructed:

The tube material can be identified on delivery with a stamped marking or attached tag stating the steel designation, for example ‘EN 10219 – S355 – JOH’.

Specifies whether TG20 compliant prefabricated structural transoms will be used to connect the standards and ledgers at every node point as described in TG20:21 Operational Guide sections 4.5 and 6.9.

If so, it may be permissible to omit the scaffold ledger bracing, unless the scaffold is sheeted, as determined by the TG20 compliance check.

Specifies whether ledger bracing will be provided at alternate standard pairs as described in TG20:21 Operational Guide section 6.12.

Ledger bracing may be omitted in specific cases where TG20 compliant structural transom units are used with un-sheeted scaffolding, as determined by the TG20 compliance check. Otherwise, ledger bracing is always required for TG20 compliant tube and fitting scaffolding.

If Automatic is selected, ledger bracing is omitted by default for un-sheeted scaffolding with structural transom units until the TG20 compliance check is performed.

Specifies whether the scaffold standards will be doubled to increase their load capacity as described in TG20:21 Operational Guide section 6.21.

If Automatic is selected, the standards will be doubled if required following the TG20 compliance check calculation.

Specifies whether the scaffold will include a foot lift, as described in TG20:21 Operational Guide section 6.10.

A foot lift may be required to stabilise double standards in moderate to high wind, as described in TG20:21 Operational Guide section 6.21. If Automatic is selected, this will be determined automatically by the TG20 compliance check calculation.

A foot lift is also recommended for scaffolding founded on sloping ground where the gradient exceeds 1 : 10.

The height of the secondary standards in metres.

This input is only required when the double standards option is set to Yes.

If Automatic is selected for the double standards option, the required height of the secondary standards will be calculated automatically by the TG20 compliance check.

Select from the tie patterns defined in chapter 7 of the TG20:21 Operational Guide. Patterns A – C provide ties at alternate lifts and patterns D – F provide ties at every lift. Patterns C and F provide half the quantity of ties and should be used in conjunction with the guidance in section 7.6 of the TG20:21 Operational Guide.

Specifies whether to tie at the top lift at alternate standards, as described in section 7.5 of the TG20:21 Operational Guide.

This can increase the maximum permitted height of a TG20:21 compliant scaffold, depending on the scaffold configuration and wind exposure.

If this option is selected for TG20 tie patterns A and B, additional ties are provided at the top lift if not already provided by the tie pattern.

Scaffolds with debris-netting or sheeting should be tied at the top lift at the ledger-braced frames to be TG20 compliant.

Specifies whether the façade to which the scaffold is tied is:

This is defined in section 6.22 of the TG20:21 Operational Guide.

Free-standing scaffolding not tied to a façade, such as for timber frame construction or demolition, is not in the scope of TG20:21 or this software.

Specifies whether the capacity of the building fabric, anchor and tie assembly is known, as described in section 7.10 of the TG20:21 Operational Guide.

If the tie capacity of the building (and tie assembly) is known, it is stated on the calculation report, compared with the tie duty and a pass or fail result is displayed. If the capacity is not yet known, the required tie duty is simply stated.

The maximum permitted tie duty capacity for the building fabric, anchor and tie assembly, as determined from the preliminary anchor testing described in section 7.18 of the TG20:21 Operational Guide and the tie assembly capacities stated in table 7.2.

Specifies whether the scaffold will include a TG20:21 compliant pavement lift to act as a pedestrian thoroughfare in accordance with TG20:21 Operational Guide section 10.2.

Determines how the pavement lift will be stabilised, as described in TG20:21 Operational Guide section 10.3. The following options may be used:

If the scaffold has only a pavement lift it must be stabilised using ties. The other options require at least two lifts.

Specifies whether to include a TG20:21 compliant light-duty cantilever protection fan in accordance with TG20:21 Operational Guide section 10.5.

The number of the lift at which the fan is located, counting upward from ground level zero.

Specifies whether the scaffold will include an opening supported by a bridge beam assembly.

The bridge should be in accordance with TG20:21 Operational Guide chapter 9.

The number of the lift at which the bridge beam assembly is located, counting upwards.

The start position of the bridge, defined as the centre position of the left standard supporting the bridge.

The span of the bridge, defined as the centre-to-centre spacing of the supporting standards.

The bridge span is limited by the available scaffold length and the maximum permitted span of the selected bridge beam.

Specifies whether the standards supporting the bridge are doubled to the top beam chord, following the guidance in TG20:21 Operational Guide section 6.21.

If the Automatic option is selected, double standards will be applied if required following the TG20 compliance check.

Allows you to select the beam type from the available manufacturers.

This option allows you to stack up to 3 bridge beams in the lifts above if a single beam is not sufficient.

If the Automatic option is selected, the number of stacked beams will be determined during the TG20 compliance check, in accordance with TG20:21 Operational Guide section 9.5.

Specifies whether the inner platforms are to be supported by inside-board (hop-up) brackets, as described in TG20:21 Operational Guide section 6.18.

One such platform may be offset vertically from the lift by up to 0.5 m in the step-up or step-down position.

Specifies whether a single-lift inner cantilever platform up to 5 boards wide will be provided, in accordance with TG20:21 Operational Guide section 6.19.