Staff Answer
Oct 19, 2021 - 11:22 AM
Per the Technical Data Sheet Overview (direct link below), this caulk has a service range between -40 degrees F to 200 degrees F. Which can look pretty narrow if you know the interior of your fireplace can get above 1,000 degrees. We would advise you carefully measure where you are planning to caulk to make sure you are within acceptable ranges. An IR (infrared) thermometer is the way to go here.https://www.greenbuildingsupply.com/c...
