I have engineered floor installed. (I cant post the link but you can find it with "berry alloc saga") It is 3.3mm oak and the planks are 1.2m (4ft) to 18cm (0.6ft). It has a click system for connection on all sides. It is glued to the cement underfloor. There is floor heating with warm water. The floor heating is clearly wrongly installed and configured. The gas boiler often shuts down due to overheating (input water to the floor becomes > 110C). This happens once every 2 weeks, or as often as 3 times in 2 hours. The boiler was not configured properly, and it was passing 80C (175F) to the floor for at least 2 months. The installer came and did something to limit the hot water to 35C (95F) but it did not resolve the problem. Still, for the last 4 months, from time to time the water going into the pipes goes up to 75C (167F). I bought a tempt logger and over 72 hours 42% of the measurements were above 35C (95F). I believe that as a result the floor is now damaged. The narrow ends of many boards are coming slightly up (0.5-1.5mm) and if I knock with a fingernail there it sounds hollow. If I knock in the middle of the board it sounds solid. The sound difference is exactly as if you take a jar with jam and knock on the thin top and on the glass side. The people dealing with the issue say that if they fix the temperature problem the floor may recover itself. Also that the floor is not de-laminating because then the hole floor must be unglued and must sound hollow not only the edges. I believe that once a wood is twisted in this way it will never go back. Question: 1. Who do you think is right? 2. If they fix the temp will the damage stay like that or will it increase with time? My other concerns are: The heating guys want to get the vendor for assessment, but this means that even if the floor is OK the floor vendor will cancel the warranty. If the damage remains like that for now, the lift at the edges will increase over time and when I want to sand it, the result will be bad. I would also appreciate if your opinions are referenced with a source (e.g. floor professional, producer, woodglue guru, etc) I add some pictures for reference. And then you in advance!
Just the area around the joints - 1-2cm around the edge and mostly on the short side. Some long edges are sounding solid - on both of the adjacent planks, some long edges sound hollow for 20 cm then the sound become solid. On several spots I can push one of the edges down and it springs back. That's visible on the attached pictures where you can see finger. One photo is with pressed edge, the other is with released edge.
