Find answers to our most frequently asked questions. If there is anything else you would like to know, please get in touch.
1. How is UVR resin different to UV stable resin?
A: UVR is UV resistant but this may just be temporary protection, as opposed to UV stable resin, which resists discolouration and degradation of the surface.
2. How porous is resin bound?
A: Depending on the formulation and grade of the aggregates, you are looking at an average of 850 litres of water per m² per minute.
3. Do I need planning permission?
A: You will not need planning permission if you install a new or replacement driveway of any size that has a porous surface. This means that you won’t need planning permission for resin bound surfacing, as it will allow water to drain away. If you were to install a non-porous material instead, in an area over 5m² in size, then you would need planning permission.
4. Does the surface of the site need a new base?
A: Ask yourself – if the base stable? The resin bound system will only be as stable as the base it is laid on. If in doubt, consider a new base.
5. What if there is already cracking?
A: This will depend if it is structural. It will either need to be reinstated i.e. cutting out and refilling, or as an exception, controlled with a geotextile cracking mesh.
6. My concrete base has joints, what should I do?
A: Any existing joints in the base will need replicating in the resin bound surface.
7. We have existing damage to the base, does it need to be replaced?
A: Does it need reinstating, or can it be covered with the resin bound surface at an increased depth? Holes and degradation may require independent inspection.
8. We have tree roots to consider, what should we do?
A: It is a decision for the homeowner or tree officer as to whether they wish the roots to be covered with the resin bound or left proud of the surface.
9. What happens to the resin bound surface if tree roots move?
A: Tree roots are extremely strong. They will crack most surfaces, but the roots themselves will not be harmed.
10. What is the resin bound surface going to be edged with?
A: It is advised that the resin bound surfacing system is installed to an edge using, for example, setts or beading.
11. Will my existing edging be suitable, or will it need replacing?
A: If it is well secured by means of cementitious bedding then it may be suitable, but the installing contractor needs to be sure.
12. Will my edging need protecting from the resin?
A: Yes, all blocks and edgings will need taping or sheeting as the resin will cause staining.
13. If I have existing fences or gravel boards will this act as a suitable edging?
A: No, you will require a new edging to isolate as it will disrupt the resin bound surface if it needs replacing.
14. I have just landscaped the garden, is this a concern?
A: You will have to consider ground movement when there has been major excavation or removal of tree roots. The ground will need to settle first as this could cause future cracking.
15. What if we have slopes – is this going to cause an issue?
A: A well sourced resin bound system will have the slip resistance values on request in line with BS 8204-6:2008+A1:2010 Appendix B.
16. Can I put resin bound surfacing on steps?
A: Yes – edging will probably be required to drains.
17. What do we do with manholes?
A: You can get specific screed trays or recessed manholes if required. You must consider that right angles from the square manholes can form cracks if not addressed properly.
18. I need to set an area up to work. What should I consider?
A: Make sure there is a suitably sized area to set up your mixing station. Make sure the area is secure and safe from passers-by.
19. How do I clean a resin bound surface?
A: A low pressure washer and a stiff brush.
20. Do I need to prime the surface?
A: If you have a quality sourced resin bound system then you will not be required to prime the surface.
21. How much material do I require?
A: You should check and allow 10% for natural undulations. Always check the yield guide from your supplier as all mix blends vary per pack.
22. What type of stone is required?
A: You should always use washed and kiln dried well graded aggregates that are tested specifically for the application.
23. What thickness is resin bound surfacing laid at?
A: 15mm for pedestrian and drive on/drive off areas. 18mm where there is any turning of wheels.
24. What thickness is LimePATH laid at?
A: 35mm onto a well compacted base.
25. What thickness is LimeAGG laid at?
A: 40mm onto a well compacted base.
26. What thickness is rubber granule surfacing laid at?
A: Topping is 15mm; if a shock pad is required then this varies based on the critical fall heights regulations.
27. Can resin bound surfacing cracks be repaired?
A: Yes, but you will see new for old where the natural aggregate can vary between batches.
28. What sub base is required?
A: A well compacted and rolled MOT type 3 or type 1 as per the specification from the supplier.
29. Do I need an asphalt/macadam base?
A: It is optional. The advantage of a 14mm open grade asphalt/macadam is the porosity and seamless application of the resin bound surfacing on top, so you do not have to reflect joints as you would with a concrete base.
30. Can resin bound surfacing be laid in the wet?
A: No. The resins are polyurethane based and react to moisture.
31. What is the minimum application temperature?
A: 5°C and rising for a quality 2-part resin system.
32. Can I force dry the surface to remove water?
A: Ideally you should have dry surfaces, as any forced drying using heat guns can generate extra hidden moisture. Hot air blowers can be considered.
33. Can I use levelling compounds to regulate a base?
A: Yes, but consider the drying and moisture released by new cementitious materials.
34. Do I require additional drainage?
A: Additional drainage needs to be considered such as ACO drainage channels or soakaways as required.
35. What is marking out?
A: This is the measurement of the area. You need to do this so that you have a guide to the correct depths and meterage per pack, so that you don’t under estimate or over estimate
36. What are the pack sizes?
A: 7.5kg resin to 106.25kg dried aggregates is the industry standard. You will need a resin to aggregate ratio of 7%.
37. How long do you mix the resin part A and part B together?
A: 1 minute until you get a homogenous mix.
38. How long do you mix the aggregate for?
A: In a force action mixer you are looking at a consistent 4-minute mix.
39. What type of mixer do I require for the resin?
A: A drill paddle using an MR2 paddle.
40. What type of force action mixer do I require?
A: A minimum 120 litre force action by a brand such as Baron. For rubber and resin bound usage we recommend a 200-litre force action mixer.
41. We have moss and algae growth, what should we do?
A: Weed growth should be treated prior to surfacing and it is highly unlikely that any new growth will be sustained. Periodical application of a proprietary moss and algae killer, such as ‘Algon’, in accordance with the manufacturer’s instructions, will remove and prevent any regrowth. After application, the surface should be well rinsed with clean water.
42. I have weeds appearing on my resin bound surfacing, what should I do?
A: Due to their construction, resin bound surfaces are very resistant to weeds, however, no matter how much care is taken, weeds may occasionally appear on any surface, usually as a result of windblown seeds. Small numbers of weeds can be removed by hand without damaging the surface. If the weeds are removed by hand, it is important to ensure that the full root of the weed is extracted, not broken off.
43. How do I remove chewing gum?
A: Removal of individual pieces of chewing gum can be carried out by treating each piece with a freezing spray and then scraping off the hardened gum with a wall/paint scraper.
44. We have cement or concrete marks, what can we do?
A: Cement or concrete marks can be removed with careful use of diluted hydrochloric acid or a proprietary cement remover, immediately followed by a thorough rinsing with clean water. (Please note that if a lime-based aggregate is used, the acid will tend to dissolve this as well).
45. What is a catalyst and is it safe?
A: Some cheap resin systems on the market are a 3-part resin system – part A, part B and a catalyst. These catalysts are used to speed up curing and have serious health and safety issues to the user and the environment, so they should be avoided. Only use a true 2-part resin bound formulation for optimum performance and to reduce health and safety issues on site.
46. Cracks have appeared in my resin bound surfacing, why is this?
A: This will be caused by base or sub base movement and would not be the resin at fault. The contractor will need to advise what specification they worked to.
47. Why is there is a ‘milking’/foaming effect on my resin bound surfacing?
A: This is a reaction between the resin and moisture at the installation and curing stage. It may disappear in time, but it is a failure of the contractor to install in the correct conditions.
48. How long will my resin bound surfacing last?
A: Depending on the usage (degree of traffic) you can expect between 5 years and 15 years or more depending on the quality of UV stable resin bound system used.
49. Are all LimePATH systems in the market similar?
A: No, there are many false equivalents in the market that use non-UV resins and are primarily a cheap rubber system incorporating aggregates. This differs to LimePATH, which is an aggregate UV system using a smaller percentage of rubber to optimise strength and performance.