Expanded Metal Laths
Expanded Metal Lathing is mainly produced as a key for plaster when applied on suspended ceilings and walls. It is also suitable for encasing steel columns and beams, assisting in the protection from fire. Available in sheets of 2500x700 and in galvanised or stainless steel. Riblath, stiffened by its longitudinal ribs, is produced for use on ceilings and partitions
Fixing of Expanded Metal Lathing Sheets
Fix with the long way of mesh running from support to support, with all strands sloping downwards and inwards from the face of the coating. Always ensure when fixing that allowance is made for overlapping sheets by 50mm lengthways and 25mm widthways.
To connect to timber use 40mm plasterer’s nails or staples at 100mm centres. Start at the centre of the sheet and work out towards the edges. Always fix at an angle to allow lath to be pulled tight. Ensure that compatible corrosion resistant fixings are used ie. do not use galvanised fixings with stainless products.
To fix to steel channels, tie with 1.2mm tying wire at 100mm centres. Tie by creating a 'hairpin' shape with the wire, then pull tight and twist. Take care that cut wire ends are not close to plaster surface.
To Solid Background
Expanded Metal Lath can be fixed to a solid background using a suitable fixing with an integral spacer/washer and large diameter headed screw/nail that will keep the sheets firmly in place.
Fixing Expanded Metal Lathing to Solid Backgrounds
Fixing of Riblath Sheets
Riblath is fixed so that the tip of the rib is placed against the supporting background. The rib of the sheet should run at right angles to any supports. Ensure that sheets are overlapped by a minimum of 50mm end to end and by 25mm widthways and that the ribs are nestled together.
Riblath is fixed at each rib to timber supports using plasterers' nails or staples. Ensure that compatible corrosion resistant fixings are used, ie. do not use galvanised fixings for stainless steel.
Riblath is fixed at each rib to metal support using 1.63mm galvanised or stainless steel tying wire. When joining riblath sheets overlap the edge ribs and tie the edges with 1.22mm tying wire at 150mm centres.
To Solid Background
Riblath can be fixed to a solid background using a suitable fixing which holds the ribs firmly against the background. Where sheets are installed vertically, fixings should be positioned through all ribs at 600mm centres to ensure adequate stability.