Protect your investment by knowing the warning signs before you hire. This guide to flat roofing installations in Edmonton lists six red flags every building owner should watch for. These include quotes that don't name the membrane or insulation, no plan for drainage, contractors who skip deck inspections, roof-over suggestions without a moisture check, missing workmanship warranties, and crews without torch safety training or WCB coverage. Spotting these early can save you thousands in repairs and years of leak problems.