To tile an exterior wall insulation layer, first prepare the surface by inspecting and securing loose insulation board with fasteners. Apply a layer of high-quality tile adhesive using a notched trowel to ensure uniform thickness (typically 1/8 to 3/16 inch). Lay tiles firmly, aligning edges and spacing them according to manufacturer guidelines. Use a rubber mallet to ensure proper contact with the insulation. Fill gaps with grout after adhesive sets, and seal joints with exterior-grade silicone. Protect tiles from weather exposure with a waterproof membrane.

The process prioritizes moisture resistance and structural integrity. Exterior insulation layers require precise installation to prevent water infiltration, which can degrade insulation and promote mold growth. According to the International Energy Agency (IEA) 2021 report, properly insulated walls reduce energy loss by 25-30%, while improper tiling increases thermal bridging risks. The Tile Council of North America (TCNA) specifies that adhesive thickness exceeding 3/16 inch leads to delamination, costing 15-20% more in repairs. A National Association of Home Builders (NAHB) study found that 10% of exterior tile failures involve moisture-related issues, underscoring the need for waterproof barriers. The U.S. Environmental Protection Agency (EPA) estimates that moisture damage accounts for $12 billion annually in residential construction, reinforcing the importance of adherence to TCNA standards and EPA moisture control guidelines. This method ensures compliance with building codes and extends material lifespan by up to 50 years.