Q: What is MOT Type 1?
MOT Type 1 or just Type 1 Sub-base is a granular crushed aggregate. It is used as a sub-base in construction work. Aggregate material is crushed to 40mm down to dust. This mixture of sizes makes it great for compaction, making it extremely strong and able to bare large amounts of weight.
Q: What is MOT Type 1 used for?
MOT Type 1 a high-quality fill or subbase material used mainly for applications such as road construction, car parking areas and home driveways.
Q: What is MOT Type 1 made of?
MOT Type 1 can be made from Granite, Limestone or clean Crushed Concrete. The base aggregate is crushed to give particle sizes from 40mm down to dust. The range of particle sizes within MOT Type 1 make it is easy to compact.
Q: What is the difference between MOT Type 1 and MOT Type 3?
MOT Type 3 usually contains bulkier granules than Type 1, giving you better drainage.
Q: Does MOT Type 1 have any drainage?
MOT Type 1 is commonly used as a hard-base, and is very granular - thus not having good drainage. If you're looking for good drainage, we suggest using MOT Type 3 instead.
Q: How much MOT Type 1 in a bulk bag?
One bulk bag will cover approximately 8 square metres (coverage is calculated assuming a depth of 50mm) For MOT Type 1 to perform optimally the aggregates need to be compacted to form a strong robust sub-base.
Q: How do I use the bulk bag calculator?
Simply put in the measurements of the area you're looking to cover, including the depth: click calculate - and the online calculator will tell you exactly how many bulk bags you will need for your project.
Q: Should I compact MOT Type 1?
Both the sub-base and the laying course require adequate compaction to prevent dips and undulations from appearing in your project. We reccomend using a plate compactor, or a hand tamp. We recommend that your sub-base material is compacted to a minimum of 80% of its compaction capacity.
A typical vibrating plate compactor will only achieve 80% compaction when the sub-base material is no more than 50mm thick. Therefore, you should only ever compact 50mm of aggregate at a time. So, in the case of a 100mm sub-base layer, you’ll want to compact this in two separate layers to achieve the desired result.
Q: Why should I saturate the sub-base before compacting?
Water also has an important role to play in compaction of the sub-base material. After importing and levelling your sub-base material, be it type 1, chippings, or the granite/limestone dust laying course, we recommended saturating the aggregate. By doing so, you’ll further aid the compaction of the material.
You’ll want to ensure that the water penetrates the entire depth of the sub-base material from top to bottom, but you’ll want to avoid flooding the surface. If the base is too wet, you’ll find that your plate compactor sinks too deep into surface. If this is case, allow the aggregate to dry out.