Scaffold system

AT-PAC Ringlock in ScaFix

ScaFix plans AT-PAC Ringlock scaffolding with the system's own bay lengths (2'-4 1/2"–10'-1") and depths (4'-7" (1.4 m), 3'-7" (1.09 m) and 2'-4 1/2" (0.73 m)), draws the scaffold in 3D and works out the parts list. Below is our example house with AT-PAC Ringlock.

By Ole Emil Frikstad Urstad · How the numbers are computed · Last updated 23 October 2026

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AT-PAC Ringlock around the example house, as ScaFix draws it in 3D.

How many parts does AT-PAC Ringlock need for a house?

ScaFix plans AT-PAC Ringlock with the bay lengths 2'-4 1/2"–10'-1" and the scaffold depth 2'-4 1/2" (0.73 m). On ScaFix’s 37'-5" (11.4 m) × 17'-4 1/2" (5.3 m) example house, scaffolded all round, AT-PAC Ringlock needs 563 parts; Bil-Jax Ring Lock needs 565 on the same house.

The system in ScaFix

Manufacturer: AT-PAC
System type: Modular scaffold with rosettes
Variants in the system picker: AT-PAC Ringlock
Bay lengths: 3.07 m, 2.57 m, 2.07 m, 1.57 m, 1.4 m, 1.09 m, 1.04 m, 0.73 m
Depths: 1.4 m, 1.09 m, 0.73 m
Source of the tie rule: Doka Ringlock User Information 999817902 (09/2023) p. 74 + Appendix D p. 75–76
DIBt approval: DIBt Z-8.22-992
Bay lengths in feet and inches: 10'-1", 8'-5", 6'-9 1/2", 5'-2", 4'-7", 3'-7", 3'-5", 2'-4 1/2"

Good to know

AT-PAC Ringlock is the same product as Doka Ringlock: Doka’s certificate 999663002 is based on the AT-PAC Ringlock system (DIBt Z-8.22-992, holder Atlantic Pacific Equipment).

Close-ups from the 3D model

Close-up of the corner where the long wall and the gable wall meet, with AT-PAC Ringlock standards, decks, guardrails and toe boards in the ScaFix 3D model — The corner: the bays of the two walls meet, with deck, guardrail and toe board on each lift.

Close-up of the top AT-PAC Ringlock lift below the eaves, with guardrails and toe boards, in the ScaFix 3D model — The top lift below the eaves, with guardrails and toe boards.

The example house with AT-PAC Ringlock

ScaFix's own example: the 11.4 m × 5.3 m house with a gabled roof, eaves 4.5 m and ridge 6 m, scaffolded all round. The numbers below are the app's own, worked out by the same engine as in projects.

System: AT-PAC Ringlock
Scaffold depth: 0.73 m
Decks at: 2.5 m, 4.5 m
Top deck: 4.5 m
Access: Decks with ladders
Parts in all: 563

The walls and the bays

The walls of the example house with AT-PAC Ringlock
Wall	Length	Height	Bays
Wall 1	37'-5" (11.4 m)	14'-9" (4.5 m)	1 × 2'-4 1/2" (0.73 m) + 3 × 10'-1" (3.07 m) + 1 × 8'-5" (2.57 m)
Wall 2 (gable)	17'-4 1/2" (5.3 m)	19'-8" (6 m)	1 × 2'-4 1/2" (0.73 m) + 1 × 10'-1" (3.07 m) + 1 × 8'-5" (2.57 m)
Wall 3	37'-5" (11.4 m)	14'-9" (4.5 m)	1 × 2'-4 1/2" (0.73 m) + 3 × 10'-1" (3.07 m) + 1 × 8'-5" (2.57 m)
Wall 4 (gable)	17'-4 1/2" (5.3 m)	19'-8" (6 m)	1 × 2'-4 1/2" (0.73 m) + 1 × 10'-1" (3.07 m) + 1 × 8'-5" (2.57 m)

The parts list for the example house with AT-PAC Ringlock

The whole parts list for ScaFix's own example, grouped the way the app shows it.

The parts list for the example house with AT-PAC Ringlock
Part	Length	Count
Frames and standards
Standards	6'-6 1/2" (2 m)	80
Standards	3'-3 1/2" (1 m)	40
Ledgers and beams
Ledgers	10'-1" (3.07 m)	48
Ledgers	8'-5" (2.57 m)	24
Ledgers	2'-4 1/2" (0.73 m)	24
Transoms		60
Decks
Decks without ladder	10'-1" (3.07 m)	15
Decks without ladder	8'-5" (2.57 m)	8
Decks without ladder	2'-4 1/2" (0.73 m)	8
Decks with ladder	10'-1" (3.07 m)	2
Guardrails
Front guardrails	10'-1" (3.07 m)	48
Front guardrails	8'-5" (2.57 m)	24
Front guardrails	2'-4 1/2" (0.73 m)	24
Toeboards
Toeboards	10'-1" (3.07 m)	16
Toeboards	8'-5" (2.57 m)	8
Toeboards	2'-4 1/2" (0.73 m)	8
Diagonals
Diagonals	8'-5" (2.57 m)	4
Diagonals	2'-4 1/2" (0.73 m)	8
Ends
End guardrails		8
Wall ties and fittings
Wall ties		29
Wall-anchor fittings		29
Right-angle couplers for wall ties		8
Base jacks and legs
Base jacks / legs		40

This is our example. The parts list for your own walls follows your measurements and settings.

AT-PAC Ringlock compared with similar systems on the same house

The same example house, computed by the same engine with each system's bay length and default depth. The difference in piece count comes from the bay length, the depth and how the system is built.

The example house with AT-PAC Ringlock and similar systems
System	Bays on the long wall	Depth	Parts in all
AT-PAC Ringlock	1 × 2'-4 1/2" (0.73 m) + 3 × 10'-1" (3.07 m) + 1 × 8'-5" (2.57 m)	2'-4 1/2" (0.73 m)	563
Bil-Jax Ring Lock	1 × 3' (0.91 m) + 3 × 10' (3.05 m) + 1 × 8' (2.44 m)	2'-4 1/2" (0.73 m)	565
BrandSafway SafLock	1 × 3'-9 1/2" (1.15 m) + 2 × 10' (3.05 m) + 1 × 7' (2.13 m) + 2 × 5'-2" (1.57 m)	3'-9 1/2" (1.15 m)	693
StepUp RingLock	1 × 3' (0.91 m) + 3 × 10' (3.05 m) + 1 × 8' (2.44 m)	2'-4 1/2" (0.73 m)	565

AT-PAC Ringlock: parts by wall size

Scaffold depth 0.73 m, access: decks with ladders. Each wall is a whole number of 3.07 m bays, so the scaffold covers it exactly. One straight wall, no corners.

Parts by wall size with AT-PAC Ringlock
Wall (length × height)	Bays	Decked lifts	Frames and standards	Decks	Base jacks and legs	Wall ties and fittings	Parts in all
20'-1 1/2" (6.14 m) × 13'-1 1/2" (4 m)	2 × 10'-1" (3.07 m)	1	12	3	6	9	57
40'-3 1/2" (12.28 m) × 19'-8" (6 m)	4 × 10'-1" (3.07 m)	2	30	9	10	24	150
60'-5" (18.42 m) × 26'-3" (8 m)	6 × 10'-1" (3.07 m)	3	56	19	14	34	277
80'-7" (24.56 m) × 32'-9 1/2" (10 m)	8 × 10'-1" (3.07 m)	4	90	33	18	56	450
100'-8 1/2" (30.7 m) × 39'-4 1/2" (12 m)	10 × 10'-1" (3.07 m)	5	132	51	22	62	648

US rules for supported scaffolds (OSHA 29 CFR 1926.451)

Height-to-base: a supported scaffold taller than 4 times its narrowest base dimension must be restrained by guying, tying, bracing or an equivalent means — §1926.451(c)(1).
Ties: the first at the horizontal member closest to the 4:1 height, then vertically every 20 ft (6.1 m) or less on scaffolds 3 ft (0.91 m) wide or less and every 26 ft (7.9 m) or less on wider ones, and horizontally every 30 ft (9.1 m) or less from one end — §1926.451(c)(1)(ii)–(iii).
Guardrails: the top rail 38 to 45 in (0.97–1.14 m) above the platform on scaffolds made or placed in service after 1 January 2000, with a midrail about halfway — §1926.451(g)(4).
Toeboards, where they are needed against falling objects: at least 3½ in (89 mm) high — §1926.451(h)(4).
ANSI/ASSP A10.8 is the US consensus standard for scaffolding safety; the manufacturer's instructions apply on top of both.
ScaFix is a planning tool, not a structural calculation or approval. A competent person must check the scaffold before use.

Source

OSHA, Safety and Health Regulations for Construction, 29 CFR 1926.451 (General requirements for scaffolds).

https://www.osha.gov/laws-regs/regulations/standardnumber/1926/1926.451

How to compare the setup

These are fixed ScaFix examples, not customer jobs. Use the wall dimensions and roof shape stated with each example.
Compare the same system variant, bay lengths, scaffold depth, deck heights and access. Matching house dimensions alone do not give matching parts lists.
The displayed quantities are calculated by ScaFix's engine. Check the setup against the manufacturer's assembly instructions and the actual job; a parts list is not a structural calculation.

Limits

The number of wall ties follows the system's tie rule. Their positions must be checked against the manufacturer's assembly instructions.
Round corners, silos and hanging scaffolds are in Pro. A round scaffold is not a standard configuration and needs a calculation or the supplier's documentation. A hanging scaffold (Layher Allround and HAKI Universal) always needs a structural calculation from the supplier or an engineer.

Questions and answers

Which bay lengths does AT-PAC Ringlock have in ScaFix?

ScaFix uses the bay lengths 3.07 m, 2.57 m, 2.07 m, 1.57 m, 1.4 m, 1.09 m, 1.04 m and 0.73 m and the depths 1.4 m, 1.09 m and 0.73 m for AT-PAC Ringlock.

How many parts does the example house need with AT-PAC Ringlock?

With AT-PAC Ringlock, the 11.4 m × 5.3 m example house needs 563 parts in all, split into the groups in the table. Your own building gets its own parts list.

How many parts does AT-PAC Ringlock need for a 12.28 m × 6 m wall?

A 12.28 m long, 6 m high wall with AT-PAC Ringlock (4 × 3.07 m) needs 150 parts in all according to ScaFix: 30 frames and standards, 9 decks, 10 base jacks and legs and 24 wall ties and fittings, with decks on 2 lifts. A 30.7 m wall 12 m high needs 648.

Is the AT-PAC Ringlock plan from ScaFix approved for erection?

ScaFix is a planning tool, not a structural calculation or approval. Always check the scaffold against the manufacturer's assembly instructions and the rules that apply before you erect it.

Does ScaFix work in feet and inches?

Yes. ScaFix can show lengths in feet and inches (Imperial) as well as meters, and the parts list switches between the two. In the catalog, AT-PAC Ringlock has bays of 10'-1", 8'-5", 6'-9 1/2", 5'-2", 4'-7", 3'-7", 3'-5" and 2'-4 1/2".