The r value is not a fixed value, because it is affected by many factors. According to general conditions, the r value of this product is roughly between 0.2-0.5m²・K/W.
According to the product description, it reflects over 95% of heat with its double reflective aluminum foil coating and high-density EPE foam core. Customers consistently state it works very well as a radiant barrier.
While the product description doesn't mention anything about curved surfaces, customers mostly use it for insulation. I did not find any reviews mentioning its use on curved surfaces.
