1. Polyurethane foam
Polyurethane foam is often used as a roofing material. It is resistant to both temperature changes as well as moisture, making it ideal for this use. It is also quite easy to use on many different surfaces and can be applied to products of any shape. The reason for this is the method of its application. Polyurethane foam is first applied as a liquid spray that then foams up before drying. This means that it can be used on practically anything. It is also lightweight and easy to use but does not have all of the health hazards of asbestos, which can cause serious health conditions. Check out asbestos.net to learn more about the risks.