From reading some posts it looks like you all like a challenge. I referenced a large discoloration on vinyl flooring (in another post) that we've finally decided to replace so will see if anyone knows what may have caused it. It's a mute point now though because it is being replaced (with Earthscapes) but I thought I'd see if anyone knows how this could have happened.
The sales guy from Carpet One sent the photo to IVC to see if they had any idea how it may have happened and they were stumped. I just hope it doesn't bleed through my new flooring...
Anyway, I don't know the manufacturer of the vinyl, but it was laid 11 years ago when we built the house. We had absolutely no problems until about 1 1/2 years ago. A burned-like stain started appearing and the texture of the vinyl started changing (it's very rough now). As you can see in the picture, the discoloration kind of wrapped itself around the table and chair legs.
What really stumped us was, we put a towel over it for a few days to see if it would disappear. It got darker! We pulled the blinds in the nook for several days and it too increased the darkness. So, that doesn't seem like it was caused by the sun. Under the table leg we have a caster cup that has metal on it. I don't know if it was then heated by the sun, but under the table leg soon got even darker than where it was wrapping around the leg. Just bizarre!
The only change that was made was one of the windows in the breakfast nook had been replaced. We thought maybe a different kind of gas was used between the panes and it was intensifying the heat from the sun or something. After a conversation with the people who made the window, they assured us we were nuts!
Has anyone seen anything like this before? I can't imagine it happening to the new flooring, but the 25-year warranty will help me sleep at night knowing that if it does, it's all fine.
Like I said, just curious at this point and thought I'd throw something to entertain you.
I'll take some more pics tomorrow when the sun is out. It's in a little breakfast nook and seems that the part closest to the wall is where it's shaded from direct sunlight. But our little tests seemed to disprove the sun theory...
Have you looked under/in you crawlspace? Could there be a vent leakage or blockage?
Can you take the temp of the floorcovering at various times during the day, maybe with an infrared laser thermometer? Many people (husbands) have one they are not expensive and fun to use. I use mine to measure the temp of the fire on the bar b. As Well aspan temp when I cook. They can also be used to find leaks around windows that need caulking.
He then taught me how to use the indoor option on the new camera so here are a couple more pics.
As for the temperature, no, haven't done that before. It's a bay window that actually overhangs the basement so there is no crawlspace under it. It's just odd that for almost 10 years there was no problem and it just popped up over night.
Oh, one additional change was we had a new HVAC system put in about that time but there doesn't seem to be any leakage. The subfloor and the underlayment aren't affected at all.
Notice that the "grout" lines aren't discolored. Just adds to the mystery...
Seen it numerous times. I have seen this type of discoloration when the flooring is exposed to direct sunlight. I have seen it discolor around heat vents and I have seen this same type of discoloration underneath refrigerators, usually directly under the compressor. I have not seen it occur on the newer vinyl floors though. I have a sample that I pulled out a few years ago. Same color. I'll dig it out and post it tomorrow. I think it is more related to the heat.