Construction & Maintenance What is grade 3 waterproofing? March 5, 2026 by Mercier | Leave a Comment Grade 3 waterproofing refers to the most basic level of protection against water ingress, typically used in areas where minor leaks are acceptable and not a significant concern. It’s often employed in non-critical applications where the cost-effectiveness of a simpler system outweighs the need for absolute water tightness. This type of waterproofing is suitable for […] Read more ยป