{"id":9684,"date":"2026-06-25T07:48:56","date_gmt":"2026-06-25T11:48:56","guid":{"rendered":"https:\/\/www.moldguy.ca\/?p=9684"},"modified":"2026-06-29T06:59:28","modified_gmt":"2026-06-29T10:59:28","slug":"mold-growth-cold-walls-toronto-causes-cleanup","status":"publish","type":"post","link":"http:\/\/www.moldguy.ca\/?p=9684","title":{"rendered":"Mold on Cold Walls in Toronto: Causes, Cleanup & Prevention"},"content":{"rendered":"

Learn why mold grows on cold walls in Toronto homes, how condensation causes it, what humidity level to keep, and when to call a mold removal professional<\/a>.<\/p><\/blockquote>\n

Mold on cold walls is common in Toronto homes during winter. It usually starts when warm indoor air touches a cold exterior wall, window area, ceiling corner, or poorly insulated surface. The air cools, condensation forms, and the damp surface gives mold the moisture it needs to grow.<\/p>\n

Health Canada states that indoor mold usually grows when moisture is present, and common moisture causes include condensation on cold surfaces, plumbing leaks, poor ventilation, and water entering through walls, roofs, foundations, or windows. Health Canada also recommends<\/a> keeping indoor relative humidity between 30% and 50%<\/strong> to reduce moisture problems.<\/p>\n

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