Over how many roofs can I install another layer of roofing material?

Depending on the type of roof that needs repairs, it is possible to install multiple layers of roofing material. For example, a flat roof can typically support up to 3-4 layers of roofing material, while a steep-slope roof can typically handle up to 2 layers. To ensure the best outcome and longevity for your roof repair project, however, it is important to first inspect the existing layer and verify what kind of material can be used as an additional layer. Additionally, it is important to pay close attention to local building codes as this may vary from region to region.