When to Use Waterproofing Materials in Canadan Construction

Essential Areas Requiring Water Protection

Waterproofing is the process of making an object or structure impervious to water. While it adds a cost layer to construction, it is a non-negotiable step in high-risk areas to prevent structural decay, mold, and damp-related health issues.

Critical Areas for Waterproofing

• **Wet Areas (Bathrooms/Showers):** The floor slab and the lower section of the walls in all bathrooms and kitchen areas must be treated with a liquid waterproofing membrane before tiling. This prevents seepage into lower floors or surrounding walls.
• **Foundations (Below Grade):** The external surface of the foundation walls (below ground level) should be treated with a damp-proofing membrane or bituminous coating. This prevents capillary rise (moisture wicking up) and lateral damp penetration from the soil.
• **Flat Roofs:** Any roof that does not shed water quickly (especially reinforced concrete flat roofs) requires heavy-duty waterproofing materials (e.g., torch-on membranes) to prevent leakage during heavy rainfall.

In Canada’s climate, investing in quality waterproofing materials and professional application significantly extends the lifespan and inhabitability of the building.