The answer to 'when to replace architectural shingles' is that you should typically replace them every 15-25 years, depending on factors like weather, roof ventilation, and proper installation. Architectural shingles, also known as laminate or dimensional shingles, are a popular roofing material that can last for decades with proper maintenance. However, over time they will start to show signs of wear and tear, such as curling, cracking, or missing granules, which can lead to leaks and damage if not addressed.
If you notice that 20% or more of your shingles are damaged or missing, it's generally a good idea to consider a full roof replacement. Additionally, if your roof is approaching the 20-25 year mark, it's a good idea to have a professional roofing contractor inspect it to determine if replacement is needed. They can assess the condition of your shingles, flashing, and other roofing components to provide a recommendation.