If that is physical separation agreement, no. There is no requirement for one in VA, just that you are living apart.

M 53, W 48
T 25, M 18
S 15, D 11
"I'me done!" 6/13/2010
Exit started 8/21/2011 ILYBNILWY
W consults with L 9/2011, no papers filed
Separated 1/16/2012