There are many options with a roof covering and would suggest to explore as many options as possible.
Single ply membranes can come with a host of issues mostly due to its installation. I’ve had 2 site where the whole roof covering has blown off, many sites with leaks and 3 failed attempts to claim on the warranties.
You need to check the small print and check the terms and conditions of the warranty.
I personally have opted for a 3 layer bitumen covering.
SPM look fantastic, however it’s not until you have to deal with issues with them that you realise that its not as good as the marketing material states.
B