We are a high volume home builder and I have a problem that we have not seen before.
A home owner that has lived in the house for 3 years now is seeing "shadows" of the trusses on the ceiling? There are dark lines in the cathedral ceiling that line up with the trusses?
I have seen similar shadowing from excessive soot in the air but this home owners never burns candles and even runs a media style air filter?
Can anyone shed some light on this?