When deciding between overlay and tear-off for a built-up roof (BUR), it’s important to understand the basic differences. An overlay involves installing a new layer of roofing right over the existing BUR system, while a tear-off means removing all the old roofing material down to the deck before installing the new one. Overlays can save time and money upfront and reduce disposal fees, but they add extra weight to the roof and can potentially hide underlying problems like rotting wood or trapped moisture. Tear-offs, although more labor-intensive and costly initially, allow for a fresh start, giving the roofer a chance to fully inspect and repair the roof deck and address issues that might compromise the longevity of the new BUR system.
To make a simple DIY diagnostic, start with a thorough roof inspection: look for sagging areas, multiple layers of roofing, signs of water damage inside your attic, and softened decking. If the current BUR is intact without major deterioration or leaks, an overlay might be safe; however, always confirm weight load limits with your home’s building codes and the roof’s structural capacity. If you notice anything concerning, it’s best to call a professional roofer who has experience with BUR systems. When discussing options with the contractor, a couple of important questions to ask are: “Have you checked the structural integrity of the deck to support an overlay?” and “What warranty do you offer on overlays versus tear-offs for built-up roofing?” This will help you understand both the practical and long-term implications of your choice.