Why is my floor hissing?
In the last two days, the tiled floor in the small entry room of our 1929 tudor revival has started to hiss after we step off of it. Our home has had central heating since about 1997 (based on the age of the furnace -- there isn't even a radiator anywhere in our house); we've owned the house for four years and this is the first time this has ever happened.
The floor in this room has been settling for a while (there are gaps between the wood moulding and the floor and between the concrete door stoop and the floor) that were there when we bought it. The home inspector assured us that it was just settling that could be made prettier with wood putty, not a foundation issue. There's a storm door that seals out the cold and a glass door that leads into the foyer, but because the problem is so new, we don't think the pressure from the opening-closing is causing this.
We've looked for signs of ... reptilian unpleasantness ... but thankfully found nothing. It would be unlikely anyway, in the middle of the winter in Detroit (actual city of), Michigan.
Any ideas as to what might be causing the noise, and who we should call to fix it? Thanks very much.