The Importance of a structurally sound subbase for paving

Category: "How to" Guides, Product Information and Technical

Posted 27th September 2019 by Duncan Andrews

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One of the most commonly asked questions we get at shows and exhibitions is ‘Can you lay SureSet over our existing surface?’. As a hardwearing decorative surface product, the simple answer is yes, SureSet is suitable for overlaying a whole manner of existing surfaces such as;

  • Asphalt
  • Concrete
  • Cellular grid structures (SureCell)
  • Compacted hardcore (light foot traffic and tree pits)

….but….every project should be inspected on an individual basis!

One of the most important things to consider is that any resin bound paving installation is only as good as the subbase it is laid onto. For a vast majority of enquiries, a full dig out and build up to manufacturers specification is not a viable or cost effective option, and in most cases, the existing surface will be suitable to lay onto, but there are some important points worth considering that could save money further down the line….

Most of the time the reason you would want to invest in a new driveway is if it is damaged, cracked or full of weeds, if this is the case the first question you should ask is what has caused the damage? Before overlaying, the reason for the surface damage should be addressed and repaired to ensure it doesn’t continue to deteriorate and cause reflective damage in the resin bound.

SureSet would only advise an overlay if the existing surface is structurally sound and free from cracks and loose stone.

Often, if cracks appear in the resin bound surface it will be as a result of an issue with the subbase. Block paving can quite often cause reflective damage if the pavers come loose and start to move over time. An experienced groundworker will be able to give an accurate assessment of how well an existing block paved driveway has been constructed and if it’s suitable to lay over, but if this is the case you should expect the installation to be completed at a greater depth to increase the strength of the paving.

Below is an example of a crack caused by reflective damage from a weak concrete subbase, if you continue to read you will see how SureSet were able to offer a solution to the problem…

Cracked resin bound

Cracked resin bound before repair

Cracked paving

Damaged resin bound before repair

As you can see from the pictures, it doesn’t take much for the resin bound to crack when the subbase is damaged.

Cracked Concrete

Cracked concrete causing reflective damage

Exposed crack

Exposed crack ready for investigation and repair

Exposed crack

Exposed crack ready for investigation and repair

Exposed crack

Exposed crack ready for investigation and repair

SureSet were contacted by the customer and asked to investigate and repair the damaged area using our Maintenance Repair Kits. These kits are specially designed to repair small damaged areas and include;

  • Full instructions
  • 2 resin pouches
  • Pre weighed and blended aggregate
  • 3 pairs of protective gloves
  • Mixing equipment
  • Suresand and fine grit to cast over the finished surface

Once we had removed the damaged resin bound paving and were happy that the cause of the cracking had been resolved, we were able to use the repair kits to infill the channels with a matching aggregate. By using a matching aggregate, once the repair is cured and weather in it will blend in seamlessly.

 

Resin bound repair

Repaired resin bound

Resin bound repair

Repaired resin bound

Resin bound repair

Repaired resin bound

SureSet also offer a product called Crack Reduction Membrane which is a mesh that can act as a barrier product between resin bound paving and subbases. Crack reduction membrane is by no means a cheap fix to a poor subbase, but it is a fantastic product to use in conjunction with movement joints to add an extra barrier against possible damage.

If you would like more information on any of our products the please take a look at our online shop, or you can contact us for more information at DIY@sureset.co.uk or 01985 841180.