Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
The underlayment or sarking is a secondary weather barrier which is recommended for an integral roof system as some water or moisture may get past the roof tiles under certain circumstances. Since the Gambale concrete roof tile is a 50-year roof system, you would want to choose an underlayment that will perform under the same climatic conditions for 50 years.
