Torch-on is a composite of resin and asphalt. The term torch-on comes from two layers that are thermally fused together. These types of roofs are ideal for both commercial and flat or low-sloped residential roofs. (Also known as torch-down roofing). It is very resistant to weather damage, pests, rot and debris. In the moist, wet Vancouver climate, it is a great choice for long-lasting roof protection.