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Understanding the Differences: MOT Type 1 vs. MOT Type 3 Aggregates

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When it comes to choosing quarried aggregates, you need to be correct, especially when it comes to selecting the right type of sub-base for your project. At Mainland Aggregates, we're committed to making this choice easier for you by offering a full range of MOT aggregates, including the widely recognised MOT Type 1 Sub-Base and MOT Type 3 Sub-Base. Each of these aggregates serves a specific purpose, and understanding their differences is crucial to ensure the success of your construction project. 
  
What is MOT Type 1? 
  
MOT Type 1 is the go-to aggregate for any construction project requiring a solid sub-base. Comprising generally of granite, limestone, basalt, or gritstone crushed into sizes ranging from 40mm down to dust, it creates an easily compacted aggregate with a variety of particle sizes. This versatility in size allows for excellent load-bearing qualities and easy compaction, making it ideal for areas that will see high traffic. Certified under the Department of Transport Specification for Highway Works, clause 803 (SHW 803), MOT Type 1 is indispensable for creating durable highways, car parks, footpaths, driveways, and building bases. Its reliability and effectiveness make it a staple in construction, particularly where a firm and certified sub-base is required. 
  
What is MOT Type 3? 
  
MOT Type 3 offers a slightly different solution, focusing on projects that necessitate reduced fines for better drainage, such as in Sustainable Drainage Systems (SuDS) applications. Like MOT Type 1, it consists of crushed granite, basalt, or limestone, but it's processed to create a reduced fines aggregate (though not zero fines), making it particularly suitable for areas where water drainage is a critical consideration. Certified according to the Department of Transport Specification for Highway Works, clause 805 (SHW 805), MOT Type 3 is often chosen for sports pitches, equestrian surfaces, driveways, and tennis courts, where preventing drain blockage is paramount. Its popularity has grown with the increasing implementation of SuDS regulations, making it an essential material for constructing permeable surfaces. 


  
Choosing Between MOT Type 1 and MOT Type 3 
  
The choice between MOT Type 1 and MOT Type 3 aggregates ultimately depends on the specific requirements of your project. For areas subjected to heavy use where a robust and reliable sub-base is needed, MOT Type 1 is your best bet. On the other hand, if your project demands a focus on drainage, particularly in compliance with SuDS regulations, MOT Type 3 becomes the preferable option. 
  
At Mainland Aggregates, we take pride in being leading suppliers of both MOT Type 1 and MOT Type 3 Sub Base aggregates. With our extensive range and nationwide delivery, we're here to support your project with the highest quality materials, ensuring your construction meets and exceeds the required standards. Whether you're laying a driveway, building a sports facility, or working on highway construction, understanding the unique properties of these aggregates will help you lay the groundwork for success. 

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