How does granite’s hardness affect the ease of drilling holes for ventilation?

Granite's exceptional hardness, typically ranking 6-7 on the Mohs scale, significantly complicates the process of drilling ventilation holes. This natural stone's dense crystalline structure, primarily composed of quartz and feldspar, demands specialized drilling equipment and techniques. Standard drill bits quickly dull when attempting to penetrate granite, making diamond-tipped drill bits essential for effective hole creation. The drilling process generates substantial heat due to friction, requiring continuous water cooling to prevent bit damage and ensure clean cuts. Professional contractors must use slow, steady pressure with high-powered drills, as rushing the process can cause cracking or uneven holes. The time required for drilling ventilation openings in granite can be three to five times longer than softer materials, significantly impacting project timelines and labor costs. Proper drilling angles and experienced operators become crucial factors in achieving precise ventilation holes without compromising the structural integrity of the granite slab. The hardness also affects hole size consistency, with deeper holes often showing slight diameter variations due to bit wear. Modern solutions include laser-guided drilling systems and specialized cooling compounds that enhance efficiency while maintaining precision in ventilation hole creation through this challenging material.