Understanding Resin Bound Bases
Installing a resin driveway is as important as mixing and laying the system.
What is the difference in a base and sub-base?
A resin bound installation has two bases. The base and the subbase are the key components. Although it can be difficult to distinguish between them, each one is equally important and must be understood.
What is the base of this?
The base refers to the surface where the resin bound material is laid and bonds. This is also known to be the binder course’. The term “base” can sometimes be misinterpreted to mean the entire structure below the resin bound system (including its sub-base). It is important to understand the differences.
What is the Sub-base?
The sub-base is the layer that lies beneath the resin bound surface. A solid sub-base is essential for strength and stability. It also serves as a platform to work on the base.
What is the best base for a resin-bound system?
If you are placing a permeable sub-base above your subbase (such open course macadam), your subbase for a resin bound method should be well compacted to MOT type 3. MOT type 1 is recommended if the base is not permeable and has sufficient slope to allow water flow into a drain.
Permeability is required for resin-bound installations to be SUDS compliant.
What are the main Resin Bound binding course materials?
Concrete and Macadam are the two main binder materials or base substances for resin bound systems. Each one has its own advantages and disadvantages.
Here are some best practices and a basic base building.
Resin bound base for tarmac
Macadam is a type a construction surface made with successively compressed layers of crushed stone and bound with bitumen or tar. The Macadam system is suitable for resin bound systems that are permeable to water and SUDS compliant.
A macadam base course should be built up to a depth of 50mm and a 14mm porous, close-graded surface macadam.
Concrete base made of resin-bound concrete
Concrete is one of most popular building materials around the globe. Concrete usage globally is more than double the amount of aluminum, wood, plastic, and steel combined.
Concrete bases or binder courses can be used to create a resin bound system. However, it is not permeable and will need additional drainage and a suitable fall for water to flow into the drainage. This is in compliance with SUDS.
C25 smooth brushed concrete is recommended as the base for a concrete course. New concrete will require a primer. Concrete should also be fully cured before it is attached to a resin bound driveway.
Is an existing driveway suitable for Resin Bounding?
There are some things you should do before you lay a resin bound surface on an old base or binder course. These are:
- Are there any steps you need to work?
- Is there any cracks in your base? These cracks need to be sealed with a layer membrane.
- It is important to repair any damage areas to a minimum of 200mm.
- You should always install an edge when there is a boundary. Removing a boundary can cause damage to the resin-bound surface.
- Do you need edging details? Concrete kerbing or block should be installed 18mm above the base edge.
- Make sure you clean the base thoroughly using a powerwash.
- The resin bound surface must be fully dried before it can be laid. Resin and water cannot be mixed.