Corrie Wise Roll Form Welded Mesh
Questions
1. What is the most secure and safest way of fixing roll form welded mesh? Answer
2. What is the recommended line wire to support the roll form welded mesh and how many lines should there be? Answer
3. Are there any options to increase the strength of the roll form welded mesh? Answer
4. What post centres best suit roll form welded mesh? Answer
5. What is the best practice when cutting and joining the welded mesh? Answer
6. How should the roll form welded mesh be clamped to the straining posts? Answer
7. Roll form welded mesh is a fully welded rigid fence can it cope with a running up and downhill? Answer
Answers
1. Roll form welded mesh should be fixed with stainless steel welded mesh clips. These clips form a tight round fixing that is difficult to remove.
Specification request: Roll form welded mesh to be fixed to line wires with stainless steel welded mesh clips at five no. per line wire per metre.
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2. Either 3.15mm high tensile galvanised line wire or 3.55mm mild steel line wire should be used for both galvanised or coated roll form welded mesh. The quantity of line wires depends on the height of the fencing. 900mm to 1800mm would typically have 3no line wires. This number increases depending on the application and height. Please contact J B Corrie sales for further information.
Specification request: Roll form welded mesh to be supported on high tensile 3.15mm line wires or 3.55mm galvanised mild steel line wires.
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3. The strength and longevity of the roll form welded mesh can be increased by adding additional line wires. This can be done relatively inexpensively at time of manufacture and erection. In addition to the line wires, a top rail could be added to the fence. A top rail is particularly effective if the fence is lower and could be climbed regularly (E.G. around a playing field) The top rail is fixed at each end to the posts and the welded mesh is clamped and bolted to the face of the top rail with dome head bolts.
Specification request: Additional line wires and/or top rails to be included within the fence. Top rails to be a minimum construction of 40 x 40 x 5mm angle iron with a 25 x 5mm clamp bar and 8mm bolts set at approx 300mm centres.
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4. To best support roll form welded mesh intermediate line posts should be set at maximum 3.0 metre centres. Straining posts in any straight line should be set at a maximum centre of 69.0m.
Specification request: Intermediate line posts set at maximum 3.0m centres. Straining posts in any one straight line should be set at maximum 69.0m centres.
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5. When joining rolls of 50 x 50mm welded mesh, the overlap should be a minimum of 100mm. It is also good practice for the mesh to be cut by the vertical upright and folded down to avoid any sharp edges and then clipped vertically in place with a stainless steel clip. The joins should be clipped to maximise the strength and safety.
Specification request: Welded mesh joins should be overlapped by a minimum of 100mm when using 50 x 50mm mesh (for other aperture mesh please enquire). The joins should be cut and clipped to maximise the strength and safety.
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6. The best practice to fix the welded mesh to the straining posts is by clamping the mesh between a 25 x 5mm clamp bar/stretcher bar and a full length dressing strip, which is welded to the straining post or bolted through the face of the post. It is also advisable if the line wire centres are wider than normal that there are additional bolts to secure the mesh between the line wires. This will alleviate any bowing between the lines. For high use areas like ball court goal areas it is advisable to request that the welded mesh is folded back (approx 500 mm) on its self under and over the clamp bar and clipped back securely to the fence.
Specification request: All straining posts to have a full length welded flat to clamp the welded mesh with a 25 x 5 mm clamp/stretcher bar. The flat and clamp/stretcher bar should be slotted/holed to clamp the mesh securely and safely.
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7. If the gradient isn’t significant the mesh can be angled off the straining posts and will follow the lines wires well. The angle of the mesh will be visible at the straining posts with the mesh being set out of square. Clipped and secured properly this does not detract from the overall appearance of the fencing. On acute slopes the mesh has to be cut and sloped to suit the levels. Any overlaps again have to be cut and secured properly.
Specification request: Welded mesh to follow ground levels smoothly and securely.
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Manufacturing and specifications from the fencing people in the know.
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