Galvanised (internal use) and stainless steel (external use) External Render Stop Beads for use on traditional wet 2 / 3 coat plaster application. Available as 3m lengths in galvanised finish and 3m lengths in stainless steel finish. External Render Stop Bead is predominantly used to form a neat bell shaped edge at the bottom of an external render finish, thus protecting the edge and acting as a run-off for when rainfall occurs. Galvanised product to be used in sheltered areas only, stainless steel for all other areas including coastal. Plaster depth 16 to 20mm, wing dimension 45mm.
The installation of Arrow beads should be in accordance with BS 5492:1990 (internal) and BS 5492:1991 (external)
The most appropriate Arrow bead should be chosen to suit the application, required plaster/render depth and desired finish
Beads should be fixed using plaster dabs or mechanical fixings at a maximum of 600mm intervals
Beads can also be fixed to lath sheets by the use of galvanised or stainless steel tye wire
Use tinsnips to cut the bead wings and a fine-toothed saw to cut the nosing
Care should be taken to ensure that steel beads are kept dry, and stored and handled in a way to prevent distortion and general damage, especially to the galvanised coating
This means storing them off the ground on a flat surface
The risk of corrosion in galvanised beads will normally only become apparent during the initial drying out period of the plaster, which should be kept to an absolute minimum (maximum 5-7 days), and subsequently during periods of heavy condensation and dampness
All metal components used in a particular installation must be of all the same material type, i.e. stainless fixings with stainless beads/sheets and galvanised fixings for galvanised bead/sheets
In external applications and in conditions where heavy condensation, persistent damp or regular exposure to moisture are likely, stainless steel or PVC-U beads must be used
Stainless steel beads are for use with cement-based renders and not for use with gypsum-based plasters unless they are specified with an approved protective finish