As seen in this replay some (highlevel)-Player build baracks with 2 engis.
The first engineer start to build the baracks to 1/2 finish. When the second engineer is build and arives at the baracks to build the rest, the first engineer go capping. - Why??
Is there a (mili-)second faster building-time? What is the advantage?
if you build it with the second engi then your rax builds before you hit 270 mp and if you build it completely with the third you overshoot 270 mp by a fair bit. When done right this method allows you to finish the rax just as you hit 270mp and queue the rifle instantly plus you have the cappin power of 3 engis instead of the normal 2
Although I haven't tested it I'm pretty sure the move where you send your initial engineer that was constructing the rax to go cap, and let the newest (2nd built) engie finish building is slower than just sending the 3rd guy out to cap. There is a delay while the 'building' animation occurs before construction actually starts, so taking a guy off and putting another one on loses you some time.
Casted: http://www.gamereplays.org/companyofheroes...ils&id=3660