Use ball size as an initial screening check
The R&A equipment rules state that a conforming ball must not be less than 42.67 mm in diameter. This supplies a useful reference dimension, but it does not establish a safe net aperture by itself. The R&A: ball conformance, size.
For an illustrative rigid square opening 25 mm on each side, the diagonal is 25 × √2 = approximately 35.36 mm. A flexible net does not remain a rigid square under load: its geometry, stretch, knot behaviour and edge restraint must be assessed under the intended impact conditions.
Do not use this diagonal calculation as a net certification method. Obtain evidence or assessment for the identified net and its installed arrangement.
Map where escaped balls could go
Record tee positions, playing directions, adjacent land uses, public routes, roads and buildings. Include likely changes in use, such as another tee line or a different practice activity. The relevant net height and extent depend on the site assessment and cannot be selected solely from a standard product height list.
A fence directly beside a tee and a distant boundary behind a landing area face different ball paths. Give the specialist reviewer a scaled plan and levels rather than only a photograph of the boundary.
Define the net as a finished component
| Specification field | Required information |
|---|---|
| Net material | Identified product and relevant durability evidence |
| Mesh description | Measurement method and finished opening geometry |
| Net panel size | Installed dimensions and fabrication allowances |
| Edges and seams | Connection, overlap and retention detail |
| Supports | Posts, cables, anchors and design references |
| Operation | Inspection, permitted adjustments and closure procedure |
Twine diameter alone cannot establish retained strength after exposure or repeated impact. Ask what the evidence measures and which product configuration it covers.
Separate geometric area from the order quantity
Suppose an illustrative boundary has three net sections 12 m, 15 m and 18 m long, each 8 m high. Gross rectangular area is (12 + 15 + 18) × 8 = 360 m². If adjacent sections overlap by an approved 0.3 m at two full-height joints, the overlap contributes 2 × 0.3 × 8 = 4.8 m².
That gives 364.8 m² before any other fabrication allowance under the stated assumptions. Actual panel cutting dimensions, slack, edge construction and support geometry come from the net supplier's approved detail. Do not add a generic waste percentage and treat it as a finished net schedule.
Investigate a ball escape by location
Record where the ball escaped, the activity taking place and the condition of the nearby net and connections. An escape through a seam requires a different investigation from a ball passing above the boundary or through damaged mesh. Avoid responding to every incident by ordering a smaller nominal aperture.
Compare the event with the assessed playing positions and net arrangement. A relocated tee or changed activity may alter the relevant ball paths even where the net is undamaged. The responsible specialist should review the actual condition before deciding whether the system or operating arrangement needs changing.
Retain the incident and corrective-action record with the net-panel identities. This allows repeated events to be assessed together and helps distinguish isolated damage from a recurring layout issue. Return-to-use decisions should follow the site's procedure and the appropriate review, not simply the delivery of a replacement roll.
Allow the net and supports to do their jobs
Flexible netting needs the designed movement space. Cables and posts need a complete structural arrangement for net forces and weather exposure. Avoid attaching a high net to an existing fence merely because the posts appear substantial.
Identify access for inspection, lowering where the system permits it, repairs and replacement. A net that cannot be inspected or maintained safely can become an operational problem despite a suitable initial specification.
Keep the risk assessment, support design and net references together. For the wider project, use sports fencing selection; for response to damage, use inspection after storms or impacts. The procurement result should describe an assessed ball-containment arrangement, not just a roll of small-mesh netting.