FAQ #6 | How important is the membrane?

Installing proper membrane is extremely important. It acts as an insurance mechanism if there are any issues with your roof. It prevents moisture from entering the home. It is also very important to use the correct membrane - it must be waterproof, breathable, and high temperature grade as this will affect the fire rating. If a low temperature grade membrane is the used, it will take the fire rating down to a Class “C”, but a high temperature grade will allow for a Class “A” rating. To cut costs, some installers may choose not to use a membrane - this extremely risky and should not be considered a viable option.

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or you could just get a product that goes up on battens/purlins