If you can’t find published SRI numbers for your existing roof, you can send a piece of the roofing material to a lab for testing to confirm its SRI value. However, this is not commonly done because most buildings do not want to take out a piece of the roof. The Cool Roof Rating Council website provides a list of available Accredited Independent Testing Laboratories across the country (see Resources). Testing fees will vary, but are typically a few hundred dollars; check with each lab on its testing fee.