Understanding Resin Bound Bases
A resin driveway should be installed on a solid base.
What is the difference in a base and sub-base?
Two key bases are involved in resin bound installations. They are the base, and the subbase. While it is confusing to differentiate between these two bases, they are equally important to understand and do the right thing.
What is the base?
The base is where the resin bound system is applied to and bonds with. This is also known by 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 of resin bound surfaces is, as the name suggests the surface underneath the base (or ‘binder course’). A strong sub-base helps to strengthen the entire system and provides a stable platform for the base.
Which sub-base is best for resin bound systems?
If you are planning to place a permeable top-base, such as open course macadam, your subbase must be compacted MOT 3 MOT type 1, if the base isn’t permeable, has enough slope for water to flow off to a suitable drain, may be used.
To be SUDS compliant, a resin-bound system must be permeable.
What are the main Resin Bound binding course materials?
Concrete and macadam constitute the preferred binder or base material for resin bound system. Each has its own characteristics and advantages.
This information will show you how to build a base with the best practices.
Resin bound base for tarmac
Macadam, a type construction surface, is formed by successively compacted layers made of broken stones and then bound with bitumen (tar) or molasses. If you are looking for a resin-bound system which is permeable but SUDS compliant, Macadam would be a good choice.
A macadam base course should be built up to a depth of 50mm and a 14mm porous, close-graded surface macadam.
Concrete base with resin bound concrete
Concrete is one the most used building materials worldwide. Concrete usage worldwide is double that of steel, aluminum, plastic, and aluminium.
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.
A concrete base course should have a C25 smooth brushed concrete of 100mm thickness. On new concrete, a primer is required and the concrete must be completely cured before installing the resin bound driveway.
Is a driveway base that is already in use 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:
- Do you think there are any steps that need to be done?
- Is the base cracked? These cracks need to be sealed with a layer membrane.
- Repaired areas that are badly damaged will need to be removed at a minimum depth 200mm.
- Be sure to place an edge on any boundary. A boundary that is removed can cause cracks in 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.
- Before you lay the resin bound surface, your surface must be completely dry. Resin and water do not mix.