Waterproof backing boards typically range in thickness from 1.5mm to 4mm, with different thicknesses suitable for different applications and waterproofing needs. Thinner backing boards (1.5mm to 2mm) offer better flexibility and adaptability, making them suitable for areas requiring some bending tolerance, such as walls; while thicker backing boards (3mm to 4mm) provide higher strength and stability, making them more suitable for floors or areas bearing heavy loads.
Common waterproof backing board sizes include 1220mm×2440mm, 610mm×1220mm, and 305mm×610mm. Larger backing boards improve construction efficiency and reduce the number of joints, making them suitable for large-area wall or floor applications; while smaller backing boards are easier to cut and splice in limited spaces, making them suitable for waterproofing small areas or detailed work.