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Hi all, I'm going to apologise in advance as I have limited technical knowledge on underfloor heating and general construction. I was hoping to get some advice on our wet underfloor heating installed 3 years ago. Its one system across multiple zones. It works really well in the new extension where we have concrete flooring with a microscreed finish. However in the old part of the house we have a room with a joist flooring and engineered wooden flooring and here the heating is never warming up the room. The floor boards are always cold and a thermometer in the never shows the temperature going up. I checked the in and out pipes on the manifold and all appear warm. I decided to rent a thermal image camera to see if I could spot any problems. All the pipes are appear to be working but the temperature readings are very small 21C compared to the new extension where we get 25C.. See attached photos I am wondering if this is a normal or expected output? We as a family freeze in the winter and never tend to stay in the room long because of the cold. I don't recall how the builder installed the pipes but I do remember some insulation went in first then the pipes and followes by the flooring. I assume this is OK? I'm wondering maybe the heat is getting lost by the fact we have an external solid wall so insulation in the room is clearly not as good as the new extension but I it does not explain why the floor is stone cold. Any advice? Ps I did spot the builder placed the pump in the wrong direction so the out flow is going through the in pipes and therefore the flows which are set to max do not register any flow. I'm having this fixed by a heating plumber so that might give us more control.

I have a utility room with an existing screeded floor which is out of level by around 10mm in a distance of 2m so quite noticeable. Where I've been doing the other existing floors I have only need to do odd patches with latex prior to gluing my Wunda floor heating panels down. The room is only 2.5x2m so quite small but would take several bags of latex and a few separate layers to get it nice and level and I assume there must be a better and easier way to do it. The finish doesn't have to be perfect as it will have the heating panels on top but it does need to be level. Any advice or recommendations gratefully received. Cheers