Final answer:
For good drainage, the slab should be at least 150 mm above the ground, and the siding should be at least 200 mm above the grade, as per standard construction practices to prevent water damage.
Step-by-step explanation:
For good drainage, the top of the slab should be no less than 150 mm (6 inches) above the ground, and the siding should be no less than 200 mm (8 inches) above the grade to prevent water penetration and damage to the structure. These measurements provide adequate clearance to ensure that water does not accumulate near the foundation, thereby reducing the risk of water infiltration and potential foundational damage. This practice is typical in construction and building design to protect structures from water-related issues.
For good drainage, the top of the slab should be no less than 8 diameters above the ground and the siding no less than 15 diameters
For good drainage, the top of the slab should be no less than 8 diameters above the ground and the siding no less than 15 diameters.