Embedding them in mortar (cement + sand + water)[0] is standard if not mandatory. I helped installing them in several houses and never had any problem. Relevan

Embedding them in mortar (cement + sand + water)[0] is standard if not mandatory. I helped installing them in several houses and never had any problem. Relevant best practices to prevent problems by thermal dilatations in radiant floors: using the right amount of mortar aditives, using an approved isolant base for the pipes and using a foam stripe between walls and radiant floor. [0] Concrete = cement + sand + water + small rocks and often uses a grid made of structural steel.