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

When it comes to selecting quarried aggregates, precision is key, especially in choosing the appropriate sub-base for your project. At Mainland Aggregates, we're dedicated to simplifying this decision by offering a comprehensive range of MOT aggregates, including the well-known MOT Type 1 Sub-Base and MOT Type 3 Sub-Base. Each of these aggregates serves a distinct purpose, and comprehending their disparities is vital to ensure the efficacy of your construction endeavour. What is MOT Type 1? MOT Type 1 stands as the essential aggregate for any construction venture requiring a sturdy sub-base. Typically composed of granite, limestone, basalt, or gritstone crushed into sizes ranging from 40mm down to dust, it produces a readily compacted aggregate with a variety of particle sizes. This versatility in size permits excellent load-bearing qualities and easy compaction, rendering it ideal for areas expecting heavy traffic. Certified under the Department of Transport Specification for Highway Works, clause 803 (SHW 803), MOT Type 1 is indispensable for constructing durable highways, car parks, footpaths, driveways, and building bases. Its reliability and effectiveness establish it as a cornerstone in construction, particularly where a firm and certified sub-base is indispensable. What is MOT Type 3? MOT Type 3 offers a slightly different solution, addressing projects requiring reduced fines for improved drainage, such as in Sustainable Drainage Systems (SuDS) applications. Like MOT Type 1, it comprises crushed granite, basalt, or limestone, but it undergoes processing to yield 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 selected for sports pitches, equestrian surfaces, driveways, and tennis courts, where preventing drain blockage is paramount. Its popularity has surged with the growing implementation of SuDS regulations, establishing it as an essential material for constructing permeable surfaces. Choosing Between MOT Type 1 and MOT Type 3 The decision between MOT Type 1 and MOT Type 3 aggregates ultimately hinges on the specific requirements of your project. For areas subjected to heavy use where a robust and reliable sub-base is essential, MOT Type 1 is the preferred choice. Conversely, if your project necessitates a focus on drainage, particularly to comply with SuDS regulations, MOT Type 3 emerges as the preferable option. At Mainland Aggregates, we take pride in being premier suppliers of both MOT Type 1 and MOT Type 3 Sub Base aggregates. With our extensive range and nationwide delivery, we're here to bolster your project with the highest quality materials, ensuring your construction aligns with and surpasses the required standards. Whether you're laying a driveway, constructing a sports facility, or engaged in highway construction, understanding the distinctive properties of these aggregates will facilitate laying the groundwork for success.