Here is the "official" explanation on the rain delays from our Engineer Steve Morris:

“The Contractor has to make a decision as to whether to work or not when rain or other bad weather is forecast. If the Contractor exposes a wall or roof to perform work, and rain occurs, leading to water entering the building and causing damage to the building or resident’s property, they (the Contractor) are responsible for the cost of repairing or replacing the damaged property. This can be a significant cost. Therefore, the Contractor must carefully consider the weather forecast each day before beginning work on a building. Typically, if the forecast gives a 30 percent chance of rain, or better, the Contractor will not work. The Contractor actually loses money when he does not work, so they do not make the choice to cancel work easily.

It is understood that cancelation of work can be an inconvenience for any resident in who’s home work is scheduled on a given day. This is why, if there is a strong forecast for rain on the following day, the Contractor will decide not to work the following day. This allows the affected residents to be notified in the evening, as opposed to having to wait until the morning to adjust their schedule. When work is canceled due to weather, a notice is posted to the doors of any unit in which work was scheduled.

In developing the overall project schedule, rain days have been anticipated. Each time work is canceled due to weather, the project schedule is adjusted. The project schedule is updated daily and is available on the Association’s web site Renovation Calendar.”

Thanks to Steve for the write-up.

-Justin