overfloor

Hi all. Ripping out knackered bath today. It's up against cheap cladding/leaking from shower, not supported. I intend to fit new on on 2x1 roofing battens or even 4x2 (I have plenty of both). All videos I have seen they are not using standard silicone anymore. It's all BT1 or CT1, OB1...

I'm undergoing a renovation project and looking at installing some underfloor heating. It is a lower ground floor flat with a concrete slab for a floor. It's approx 50sqm and consists of a open plan kitchen/living room and a large bedroom. The current central heating system pipes are copper...