Question: what is type 1 material?
Answer: Also known as GSB TYPE 1 or MOT TYPE 1 - this is a granular material with a maximum permitted top size of 63mm, graded down to dust. Type 1 must be of a crushed nature to provide a stable sub-base for road surfaces and pathways. ... Both primary and recycled constituents can be used to produce a Type 1 sub-base.