MOT Type 1 and Type 3 are both granular materials used in pavement construction, but they should not be treated as interchangeable when planning a resin driveway. The drainage strategy and complete build-up determine which type of sub-base is appropriate.
What Is Type 1?
Type 1 is a well-graded granular sub-base designed to compact tightly. It is widely used beneath paving and other hard surfaces, but a tightly compacted Type 1 layer should not automatically be described as a permeable sub-base.
What Is Type 3?
Type 3 is an open-graded granular material with fewer fines, creating void space within the compacted layer. It can therefore form part of a permeable pavement construction when the ground conditions and overall design are suitable.
Which Is Better Under a Resin Driveway?
There is no single answer for every property. If the driveway is being designed as a permeable construction, an open-graded sub-base may be required. Other sites may use a different drainage strategy. The sub-base must be considered together with the subgrade, resin-ready base, falls and drainage.
Can Resin Be Laid Directly Onto Type 1 or Type 3?
No. These are sub-base materials, not the finished continuous laying surface for a standard resin-bound driveway. A suitable resin-ready base is required above them.
Read our guides to no-fines concrete, permeability and drainage and the best resin driveway base.