You are smart to focus on the underlayment as that is the true waterproofing layer on a tile roof. With the introduction of machine made clay tiles this has now dropped slightly to 30 similar to the marley hawkins single camber tile. 15 17 5 pitch with a rafter length up to 10m will require a 100mm headlap 17 5 pitch and above with a rafter length up to 10m will require a 75mm headlap.
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