Hi,

With OSB faced SIP roof panels, when you guys talk about creep, does that mean lengthwise or widthwise?  The reason I ask, is that in one room, on the drywall ceiling there is a real faint line that spans a couple of feet (not the entire ceiling).  It looks similar to a drywall seam.  I looked in the attic and it is not in line with a SIP panel seam, it's more in line with the center of a panel.  Maybe I'm just seeing things but when you guys talk about OSB creep, can that occur in the middle of panels or does that mean the long way?

Thanks.

rfleege,

It does mean in the center of the panels length (span).

Creep is defined as the inelastic strain caused by the stressing of a material for any period of time. Or, 

The deflection of a structural product due to the long-term application of  load is termed creep.

Here's an online article: CREEP TESTING OF STRUCTURAL COMPOSITE PANELS