I called for technical guidance on Friday 5 PM Eastern standard time, unsure what time they close but there was no answer so I left a message and Im waiting response. Trying to determine if their flooring is approved and warranted over Radiant Floors and also if theres a difference between the flooring with underlayment already built-in versus the one that doesnt require underlayment. It has been impossible to find contact information for them directly, I hope that if I purchased a product any customer service support or warranty claims wont be even worse. User's recommendation: Cross your T’s and dot your I’s.