Tried alt.building.construction with no luck.
What is it and what was it for?
Pics worth 1000 words. Here they are:
Click on View
Click on the picture to enlarge.
House is 28 yrs old. I have found on the trimboards that there is a grey
paperlike (?) coating under the paint. It appears to be factory
installed. When exposed material gets wet it gets soft and mushy. If it
has been wet for a few minutes, a pressure washer will just melt & blow
away leaving the bare wood.
Backside of board. Grey paper all on front. Wraps over one edge to
back. The paper has a thickness and you can slide a razor blade from the
bare wood to the paper and get under the paper.
Backside 2: nother backside pic
Backside 3: and another.
Painted side. Although this was found on the exterior trimboards it
was also found on some of the old boards indoors. This is from a closet
rod bracket which has always been painted around. Grey paper (?) under
layers of paint.