Resin Bound Knowledge Base
Resin Bound Knowledge Base
Product Suitability - Overlay
An 'Overlay' simply installs the resin bound surface directly on top of the existing surface.
● ASPHALT / TARMACADAM - OVERLAY
Application to an existing asphalt/tarmacadam/bitmac surface:
Most surfacing systems specify that a bituminous surface must have a specific penetration (PEN) value however in practical terms, this information is rarely known about a pre-existing surface. If an asphalt/tarmacadam surface is over 24 months old, shows no indications of movement, slumping, compression (such as depressions made by vehicle tyres) or cracking then it is likely to be suitable for a resin bound surfacing overlay application. If the surface does show signs of damage then the pen value may exceed 100 and the use of a resin bonded product such as StarScape FLEX should be considered. As with concrete, unless the existing surface is open-graded or directs water to a soak-away it will not be SuDS compliant. Installers will not typically offer a guarantee on an overlay installation as the most likely cause of cracking or delamination is the base on which the resin is laid.
● CONCRETE - OVERLAY
Application to an existing concrete surface:
If the concrete is over 12 months old and shows no signs of cracking, dusting or chemical contamination then it is likely suitable for a resin bound overlay application however it should be noted that such an installation will not be porous and a decorative bonded product (such as StarScape PRO) should be considered. A resin bound surface should never be applied to a cracked/damaged concrete base. Damage to the surface can be repaired in order to make it suitable for a resin bound overlay however it is essential that the original source of any problem is addressed. Installers will not typically offer a guarantee on an overlay installation as the most likely cause of cracking or delamination is the base on which the resin is laid.
● COMPACTED DTp / MOT SURFACE - OVERLAY
Application to an existing compacted DTp/MOT surface:
Application of a resin bound surface onto a compacted, DTp/MOT base should only be considered if the completed installation area will not be subjected to any forms of vehicular traffic or heavy loads (such as garden paths and tree-pits). A resin bound surface laid directly onto an existing compacted base should be a minimum depth of 30mm.
IMPORTANT: The base course is essential in providing both the load-bearing capacity and permeability of the completed resin bound surface and as such, it is essential that StarScape ULTRA is only installed on a base that meets the minimum specification requirements. The base course should be laid seven to ten days in advance by a specialist installer and laid to levels within an accepted tolerance of 5mm. Any deviation within the tolerance can be corrected with the StarScape ULTRA surface course however high/low areas beyond the tolerance should be corrected with additional base course material, in order to achieve the required performance and coverage rates from the StarScape ULTRA surface course.