Thread: Powdery substance on window sill

.........

Similar Threads:

• Single Wall Window Installation
• Window seal problems! Help!
• Window safety locks
• Window in combo bath/shower area
• Leaking window

Dirt.
Everything that washes down from above collects on the ledge until it dries up and leaves the dirt behind.
Did you taste it?

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.

rick

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).

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.

http://www.inspectionnews.net/home_i...eep-holes.html

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