Renderplas - Inspred by Nature

PVCu BEADING
FOR RENDERING, PLASTERING
AND DRY LINING APPLICATIONS

HOW TO USE 

Renderplas PVCu Beads are all made from exterior grade UV resistant PVCu so that they can be used both inside and out.  For rendering and wet plastering externally or internally, the considerations are dependent on the nature of the render system and background being used:

Standard Render, Sand and Cement Render, Through Coloured Render on Brick or Blockwork

Thin Coat Render, Acrylic Render, Silicone Render, Polymer Renders on Insulation or Cement Boards

 

Fixing Recommendations for Brick and Blockwork Substrates

Preparation:  Large irregularities in the substrate should be dubbed out and allowed to set hard prior to application.

Adhesive Mortar:  PVCu Beads should be set onto a continuous line of adhesive mortar.   This allows the PVC bead to be plumbed completely straight and provides additional rigidity when trowelling on render. Where through coloured render is used, the PVCu bead will not deflect when scraping back.

Mechanical Fixings: Metal and plastic fixings can be used with Renderplas beads and the choice is dependant solely on the render.  Care should be taken not to deform a traditional External PVCu bead when using mechanical fixings and should be avoided when fixing movement joints - it should only be necessary when fixing a PVCu bead horizontally to maintain straightness whilst the adhesive mortar goes off to avoid the need of a supporting baton underneath the PVCu bead.   If the fixings are non-corrosive, these can be left in prior to rendering.  Alternatively they can be removed once the adhesive mortar has gone off.

Render Dabs:  As an alternative to adhesive mortar, a bed of render or render dabs may be used.

Cutting to length: Use fine toothed hacksaw and/or tin snips.

Forming Joints:  PVC Pipe Weld adhesive can be used to form butt joints.  When joining movement joints, embed in silicone sealant to prevent water ingress.  Where corner beads and other beads intersect, compound mitre joints provide the best finish but the wings of the beads may also be overlaid to save time.

Fixing PowerBeads

PowerBeads can be fixed in exactly the same way as the Trade Range, however to save time and the cost of adhesive mortar, mechanical fixings alone can be used.  Non-corrosive mechanical fixings should be used to fix the bead directly to the substrate every 300-700mm.  There is no need for adhesive mortar or a bed of render or dabs.

 

Fixing Recommendations for External Wall Insulation and Concrete Board Backgrounds for thin coat acrylic, silicone and polymer renders

Preparation:  No surface preparation is required for the beads and consideration is given only to the needs of the render application.

Adhesive Mortar:  This should not be necessary and mechanical fixings alone are sufficient.  Render is usually sprayed on and there is no scraping back after the initial application of the render. The surface is typically extremely level and therefore there is far less likelihood of distortion to the beads and plumbing the beads straight and true is simplified.

Mechanical Fixings: Metal and plastic fixings can be used with Renderplas beads and the choice is dependant solely on the render.  Care should be taken not to deform the bead.  Fix at each end and at 500-700mm centres.

Cutting to length: Use fine toothed hacksaw and/or tin snips.

Forming Joints:  PVC Pipe Weld adhesive can be used to form butt joints.  When joining movement joints, embed in silicone sealant to prevent water ingress.  Where corner beads and other beads intersect, compound mitre joints provide the best finish but the wings of the beads may also be overlaid to save time.

Fixing PowerBeads

There are no special requirements for fixings PowerBeads and the guidelines above are applicable.

Choice of Fixings

The British and European Standard (BS EN 13914-1:2005) allows for many different types of mechanical fixings to be used.  All these fixing types are compatible with the fixing of Renderplas beads, with care always being taken not to distort the bead.
It is easy to fix the bead to the substrate using nails or clouts.  Where hammer-in plugs are preferred, the bead should be held in position, the bead and background drilled together, and the plug inserted and the fixing hammered home.  Due to the rigidity of PowerBeads, this can easily be done by one person.  For the trade range, it may be necessary for one person to support the bead whilst the other person drills the appropriate hole.

Storage

Store horizontally or vertically away from direct hot sun.  Whilst Renderplas PVCu beads are packaged in the highest quality fibreboard tubes and double-fluted cardboard boxes, care should be taken to ensure the boxes are kept straight.