stanmoor

I think you're possibly right with your first point (water still evaporating), as I can't imagine they would've let it dry.. do you think based on that it will disappear over time? I'm pretty confident there's no leak - it's all connected to the central heating (via zones controlled by Nest) - the pressure gauge on the boiler hasn't moved at all since we moved it. So on that basis, would you think it's the screed that didn't dry properly? There were marks when we moved in, and I think having the UFH on has made it most noticeable / worse.. so I suppose my options would be to replace the boards or allow it to dry over time (if that's even possible now?). Thanks for your help.

I'm not sure on that, is there a way I can check? Sorry, I'm an absolute novice at this - I know where the manifold is, is there a way of checking on there?

We recently moved into a newly refurbished property that has engineered oak wood flooring throughout the ground floor, along with wet underfloor heating in the kitchen area. Within the kitchen, the flooring has some discoloration / staining, which, when we first moved in we assumed was from a window being left open when it was raining (as it was mostly directly under a skylight). Over the past week or so though, having been running the UFH, it seems as though the discoloration has gotten worse / spread to some other areas. Could the staining be due to the UFH or something else? I checked the website from where the flooring was purchased and it says it's safe to be used with underfloor heating systems, so I'm not sure what exactly is causing the problem. No staining in the living room area (radiators are there), which is why I suspect it's an issue with the UFH. We've set the thermostat at 21 degrees over the past week in the evenings, and off otherwise. The room hasn't been colder than 20 degrees or so according to Nest despite heating off in the afternoon (well insulated, I guess..) Attached are pictures - I'd be grateful for any advice that you can share on why this might be happening and how we can fix it / stop it getting worse (if that's possible!). It's probably clearer to see in the bottom picture - the darker area in the bottom third of the pic.