What bases can be used for Resin Bound Systems?
Resin Bound systems require a stable sub base to which the resin bound system can be applied; this can be new or existing. A typical existing or newly laid base can be a surface of tarmac, asphalt, concrete or other monolithic material, as long as it has been thoroughly cleaned and prepared accordingly.
For help with preparing your surface, view our guide.
Do you need a level surface?
A level surface is most suitable for this application; however, it is not a necessity. A varied surface just means more resin and aggregate will be required to create a level surface.
Is your surface suitable for purpose?
The base should be suitable for the load it expected to carry once the resin system is applied. There is no preferred base as this can vary depending on the system used and advice from your resin supplier should be sought prior to application.
Surfaces that have fewer joints and are predominately large slab areas, such as tarmac or concrete, provide the best finish.
Bases to avoid
Bases made up of paving type products such as block paving, sets or flags are not suitable for a resin-based system. The number of cracks or lines below the surface of any resin applied to a paved surface would ultimately lead to cracks in the resin and failure of the system due to the extreme pressure loaded onto the resin day to day.
If a wooden base is to be used, only a proper exterior grade wooden deck surface should ever be considered.
Is a granular sub-base suitable?
With the exception of applications such as tree pits, resin-based surfacing cannot usually be laid on a granular sub-base (such as a layer of MOT Type 1, gravel or sand) no matter how well compacted.
Damp striking up through the base could affect the resin and, if there is a high moisture content in the base, it can seep into the resin with adverse effects such as clouding of the resin
Newly laid surfaces
Any new surface should be allowed to cure properly prior to the application of resin systems. In the case of bitumen surfaces a minimum of 28 days should be given to allow it to weather and oxidize.
For concrete, at least 7 days should be given to allow it to cure properly. With any base, it is important that the moisture levels on the surface meet an acceptable level as recommended by the resin manufacturer.
In all cases, the manufacturer's advice and recommendations should be followed regarding preparation, pre-cleaning, etching or all other requirements.
More information on different types of base can be found below: