The types segment of the market taxonomy classifies insulation products into mineral wool, polystyrene (expanded and extruded), polyurethane foam, phenolic foam, and natural‑fiber solutions such as cellulose and cork. Mineral wool, valued for its fire resistance and acoustic properties, captures a significant share of both residential and commercial projects, especially in regions with stringent fire codes. Polystyrene variants—EPS for cost‑effective bulk insulation and XPS for higher compressive strength—are preferred in foundation walls and below‑grade applications, contributing to roughly one‑third of total volume. Polyurethane foam, applied via spray or rigid panels, offers superior R‑values per inch and is increasingly used in retrofit schemes targeting deep energy savings. Phenolic foam, though premium‑priced, provides a low‑smoke, high‑thermal‑efficiency option for high‑rise commercial façades. Natural‑fiber materials, driven by sustainability mandates, are gaining traction in green‑building projects despite higher moisture‑sensitivity. This detailed breakdown supports nuanced forecasting within the Wall Thermal Insulation Materials segmentation.