I am having an extension built. A single storey with a hipped roo(slated with block wall)f. This will result in a valley gutter which I know may not be ideal but this is what we will have.
The guy that drew the plans advised a lead valley. It is L shaped 3.6m x 7m so will require steps. 3 Builders are quoting some strongly suggest glass fibre NOT lead. I also need to reduce some of the costs.
What are the pros and cons of lead v glass fibre? Are there other more durable alternatives?
Grateful to get any constructive feedback.