Select the maximum permitted uniform loading on the loading bay, in kN/m², as described in section 12.2 of the TG20:21 Operational Guide.

Select whether the loading platform will be supported by beams or whether additional standards and bracing will be introduced to support the load, in accordance with section 12.1 of the TG20:21 Operational Guide.

Select the width of the loading bay platform and tower, in accordance with section 12.1 of the TG20:21 Operational Guide.

The maximum bay length of the loading bay tower, which may be reduced below the bay length of the independent scaffold to increase the maximum safe height of the tower.

If Automatic is selected, the bay length is reduced as required by the TG20 compliance check and reported.

This input is only available for a loading bay with beams.

Specifies whether the loading bay tower is tied with lines of ties at alternate lifts or at every lift. The tower must be tied at least as frequently as the independent scaffold to which it is attached.

Where the lift height of the independent scaffold exceeds 2.0 m, the tower is tied at alternate lifts, at the principal lifts, as the structural lifts cannot be tied.

If Automatic is selected, the tie interval is determined by the TG20 compliance check.

Specifies whether the loading bay tower is tied at the top lift at both end standards, with additional ties where the tie pattern does not already provide them. A tied top lift is required for a clad scaffold, a single-lift scaffold, or where required to achieve the specified scaffold height.

If No is selected, the top lift is tied only as the tie pattern provides. Where the lift height of the independent scaffold is up to 2.0 m, a tower tied at every lift is tied at alternate end standards in a diamond pattern (tie pattern D), so its top lift is tied at one end standard.

Where the lift height of the independent scaffold exceeds 2.0 m, the tower is tied at both end standards at the principal lifts (tie pattern A), so its top lift is always tied.

If Automatic is selected, the requirement for a tied top lift is determined by the TG20 compliance check.

Specifies whether the standards of the loading bay tower are doubled to increase their load capacity, as described in TG20:21 Operational Guide section 6.21. Double standards are considered for a loading bay with beams only.

The selection also applies to the independent scaffold, whose standards may also need to be doubled.

If Automatic is selected, the standards are doubled if required by the TG20 compliance check.

The height of the secondary standards of the loading bay tower in metres, which must be at least the height required by the TG20 compliance check. The height also limits the double standards of the independent scaffold.

This input is only required when the double standards option is set to Yes. If the double standards option is set to Automatic, the required height is calculated by the TG20 compliance check.

Specifies whether the loading bay tower has a foot lift, as described in TG20:21 Operational Guide section 6.10 and as required for a TG20:21 compliant loading bay as described in TG20:21 Operational Guide section 12.1.

If Automatic is selected, the foot lift is determined by the TG20 compliance check.

Select the load class of the scaffold in accordance with EN 12811-1 and TG20:21 Operational Guide section 6.3.

The scaffold may be loaded to class 3 (2.0 kN/m²) or class 4 (3.0 kN/m²) if a loading bay is present. One platform may be loaded to this class and an additional platform may be 50% loaded.

The maximum bay length for the scaffold, limited by the load class and platform width as in Table 2.1 of the TG20:21 Design Guide.

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.

If the scaffold lift height exceeds the maximum permitted loading bay tower lift height of 2.0 m, structural lifts will be provided.

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 at alternate lifts, so a maximum of 50% of the lifts of the independent scaffold may be boarded.

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 in the independent scaffold.

The maximum number of lifts that are not boarded in the independent scaffold.

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

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

Select whether the independent scaffold to which the loading bay is tied will be unclad or whether plastic or wire brick guards (section 6.25), high-permeability debris-netting (section 6.24) or sheeting or low-permeability debris-netting (section 6.24) will be provided. All references are to the TG20:21 Operational Guide.

The loading bay tower itself will be unclad.

The tube material from which the scaffold will be constructed, in accordance with TG20:21 Operational Guide section 4.1:

The tube material can be identified on delivery with a stamped marking or attached tag stating the steel designation, for example ‘EN 10219 – S 355 JOH’.

The loading bay compliance check considers the additional load capacity of hot-formed high-tensile steel tubes in comparison with cold-formed tubes.

Specifies whether the façade to which the scaffold is tied is Impermeable (with no significant openings) or Permeable (an open structure or a façade with significant openings).

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 independent 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.