Help me solve a mystery

Or, more to the point, solve one for me.

We will call this the Mystery of the Ghost Knocking at the Door.

We moved to our present home last October. It is a two story house with 2 bedrooms and a bathroom upstairs. These are all on one side of the house. On the other side a very high ceiling, maybe 25 feet at the highest point. It highest in the center and slopes down on either side. There is a staircase. At the top, you can see living room, dining room and family room on the 1st story.

Now the mystery. We keep hearing what sounds like someone knocking at the door. We keep going to the door and open it to …no one.

The knocking started almost as soon as we moved in. The owner denies all knowledge of it. It started like a steady knock, maybe 4 or 5…normal for someone who knocked at the door. The knocks seemed a little slow, but not much. This would happen once every week to every other week.

The knocking has now become more frequent and the knocks are faster, like someone knocking at the door in a big rush. The number of knocks has also increased, 10 to 15 at a time. Today, this has happened six times already but today is anomaly.

As we have investigated, such as we can, we seem to notice that sound comes not from the front door, but above the kitchen, like a wooden shutter banging in the wind, except for the speed…and the fact that there are no shutters.

There are no rooms above the kitchen. It is at the back end of the house. There is an empty crawl space above, accessible from the top of the stairs. It is empty space. There are no ac\heating ducts. At most, a vent from the stove. The empty space is the size of a small bedroom with a sloped ceiling. There is nothing that we know of that could account for the knocking.

My girlfriend’s sister watches the ‘ghost adventurer’ and ‘haunted this-or-that’ constantly, so we tease her by saying it’s ghost. I started out sure it wasn’t. Now…

What could it be?

A squirrel in the ceiling? I dunno, I got nothing.

Has the knocking changed to coincide with the seasonal temperatures? House might be warming and cooling causing the knocking sound.

Air in the plumbing?

Sorry, I guess it’s more accurately lack of air in the plumbing. I don’t know nothin’ bout plumbing, obviously, except that sometimes, it knocks. Yahoo | Mail, Weather, Search, Politics, News, Finance, Sports & Videos

Tree branch? twigs, acorns, or other things falling out of a tree and hitting the roof or the side of the house? I lived in a house in a wooded area, and we got acorn falling off an oak all the time, not just in season. There’d be a gust of wind, and several would fall.

squirrel ghost in the empty crawl space.

Satan.

Maybe a bird? We used to have one that knocked like that outside our bedroom.

It does seem to have sped up as it got warmer. Although today is a moderate day.

There are tree limbs in the area. No flora or fauna.

Not real sure, but if it responds to the name “Jodie”, I’d be worried.

We had a knocking/ticking sound coming from one of the fan vents in our bathroom when we moved in. Something about the wind blowing would turn the fan blades or something and make a knocking sound. I wonder if something similar is coming from your stove vent hood.

Do you have a whirligig (I don’t know what it’s real name is) on top of your roof?
Squirrel running across the roof?
Tree branch barely touching the house?
Window pane rattling?
Shutter loose?
Pesky neighbor kid?

Are you sure no one is knocking and running away? Just for kicks try leaving your front door open for a few weeks whenever you’re home and see if it stops.

In your bathroom fan there’s a check valve to keep outside air from coming in. When it’s windy out and air moves across the exhaust port and make the valve bounce. It’s just a light weight plastic flipper. You can see it in the open position in this picture.

Quoth the Raven “Nevermore.”

Could it be your refrigerator? Ours makes some amazing rapping sounds and the owner’s manual says it’s normal that it does this.

Yes. That’s the thing.

Old school, like Run DMC, or more modern, a la Jay Z? :stuck_out_tongue:

It took me a while to track it down in my house as well. I’m one of those people that has to know how everything works and if I’m sitting in my house and can hear a motor running or a thing making noise I won’t be able to sleep until I figure out where it’s coming from. That one took some thinking. I probably wouldn’t have been able to place it if I hadn’t installed the fan myself. Suddenly, I could picture it flappin’ around as the wind pulled a vacuum on the vent.

Have you tried switching your furnace to “High Octane”…?