Torch-down roofing is a type of modified bitumen roofing commonly used on low-slope or flat roofs. Ice and water shield is a self-adhering membrane designed to provide extra protection where water is most likely to penetrate, such as roof edges, valleys, and around roof penetrations like vents. In torch-down roofing, ice and water shield is often installed beneath the modified bitumen layers in vulnerable areas to prevent leaks caused by ice dams, heavy rain, or wind-driven water. This membrane sticks directly to the roof deck, creating a waterproof barrier that helps protect against moisture damage and increases the roof’s overall durability.
If you’re inspecting your torch-down roof, you can do a simple DIY check by looking for signs of water intrusion around roof edges, valleys, and penetrations after heavy rain or thaw cycles. While you can’t easily see under the torch-down membrane without removing sections of the roof, any soft spots or blistering can indicate moisture trapped beneath the layers. If you suspect ice and water shield was not installed or has failed, it’s wise to call a professional roofer for a more thorough evaluation. When hiring a contractor, ask if they use ice and water shield in all vulnerable areas and how they ensure it bonds correctly beneath torch-down layers, especially around edges and flashing. Also, inquire about how their installation affects the roof warranty, as improper layering could potentially void coverage.