Have just started a major project of a complete renovation of an old farmhouse from the 1800s, and I want to install underfloor heating for the incredible comfort it provides. What should we consider, having just lifted the floorboards towards the outer wall, and it’s dry and fine, and the timber beams are in excellent condition. What do you think we should use as material instead of what we're taking out, leca balls or grateful for tips/ Jocke