Great question , I try to have a log of various work crews I've worked with . Whether its roof , concrete or even my field . So if a job i have going on I cant get to it or im over booked or my own crews cant catch up - i use sub contractors. Sure I may pay a bit more than in-house but only use crews i trust , because we get to complete job in time and leave a satisfied customer with potential referrals or repeat work and good reviews .
But another note is try to have a back up vehicle of course. I understand sometimes our budgets are tight but when time is fit spend couple of grand on a decent truck and have a back up or even start a repair crew for small jobs and if one of our big jobs gets delayed , here comes repair crew to assist
