Our G1 Sub-base is produced from drilled and blasted blue granite rock mined at our quarry. This rock is further crushed down to <37.5mm to produce a manufactured crushed aggregate sub-base. Producing crushed aggregate sub-base from drilled and blasted rock ensures that a high strength material is used. Our G1 sub-base is used as final layer works of road ways before tar is applied to the road way. Our G1 sub-base is suitable for both small scale and high spec construction projects.