View Full Version : Powdery substance on window sill

Clay White
10-17-2007, 03:44 PM

Jim Luttrall
10-17-2007, 03:47 PM
Everything that washes down from above collects on the ledge until it dries up and leaves the dirt behind.
Did you taste it?;)

Rick Hurst
10-17-2007, 03:48 PM
Probably a pest control supply dust for carpenter ants.

Some would use a boric acid base but it wouldn't be dark like that.

The more I look at it, it looks like dirt as Jimbo said.


Jerry Peck
10-17-2007, 07:03 PM
It's on the inside, stepped up, part of the sill where the window closes to, so it's basically 'out of the weather'.

But, is there a rubber/vinyl/foam/weatherstrip along the bottom of the bottom sash which closes there?

If the 'powder' was 'fine granules', did they roll around like ball bearings? If so, possibly drywood termite frass (but that is an unusual location to find it).

Jerry Peck
10-17-2007, 07:15 PM
If these threads were not posted by two different people in two different locations, I'd have guess that this was the inside view of this window.


But it's probably similar, even being two different houses.