Harmer Uni-Ring Supports



Harmer Uni-Ring is a versatile, economical system for concealed drainage beneath paving slabs, based on shallow injection moulded polyethylene rings.

Applications, Materials & Installation

  • Harmer Uni-Ring is ideal for use on terraces, walkways and balconies and is especially suited for inverted roof constructions where ballasted insulation is laid onto flat roof waterproofing
  • Harmer Uni-Ring is positioned to support adjoining slabs at each corner, whilst maintaining open joints for fast, efficient drainage and comprises stackable units with spacers for open joint drainage when required
  • Spacers are collapsible for closed jointing and edge detailing
  • Shims are available for fine height adjustment

Materials & Finishes

  • Harmer Uni-Ring is manufactured from shallow injection moulded polyethylene
  • It is watertight and resistant to mould and freeze-thaw

Installation & Maintenance

  • Harmer Uni-Ring is quick and easy to install. Traditional bedding and grouting materials are not required
  • Once installed, paving slabs can be easily lifted for simple inspection of drainage outlets and for substructure maintenance

Request your free sample pack:

Request your free sample pack:




White House Works, Bold Road, Sutton, St Helens, Merseyside, WA9 4JG