My windows which are 1 and 2 years old now (brand: Milgard, professionally installed), are starting to break away from the caulking both on the outside and the inside. I've had the company return to re-caulk one of the 2-year old windows, only to now have it crack AGAIN. Initially they only were breaking from their caulking on the outside (I have a stucco exterior), but now the vinyl strips covering the inside perimeter of the window are starting to break from their caulking. Note that the caulking is splitting in the middle of the bead (as opposed to separating from the surface it was applied to).
My question is: what is the best way to keep the windows sealed?
From what I can tell the caulk they are using is the right kind (DAP Alex Plus 35-year). The company who installed it said that it is meant to be painted, and suggested that since it has not been painted, this might cause it to be more susceptible to cracking. I've read that silicone caulking is more flexible, but also it's not paintable (which is a problem, since I will want to paint it at some point).
I have a hard time believing that the solution is to re-caulk my windows every year, there has to be a better solution.
Hope someone here can help.