Wood truss deflection over time

[L_Bey]

Creep is a known concern with wood trusses, and the additional deflection over time can lead to higher than expected deflections than those reported by the design software. I am currently working on a building where there were some drywall cracks and the owner is concerned that the building is not done moving, and any repairs would need to be re-done as the structure continues to deflect. Typically with deflection there is the instantaneous portion, and then additional creep that starts out quickly and after a time the change levels off and approaches the actual maximum long term values. The building has been up for over a year, so it seems like we should be well into the longer term deflection, but I haven't been able to find much in the way of data on when the deflection curve starts to level off.

I have found a paper from the Slovak University of Technology which does deal with this (

http://www.woodresearch.sk/wr/201602/07.pdf),

but not much beyond that. Does anyone have information on how long it takes for the majority of the deflection in wood trusses to occur? Or experience with crack repair of this nature?

Thanks!