Before we paint our house I want to explore the idea of maybe getting a bid on doing stucco. The top half of our exterior wall has 2" x 2" slats running horizontally every 16" above brick. I would like to install a foam board between the 2" x 2" slats to add some insulation value instead of removing slats. This part of the project I would do. Does this seem like a reasonable idea? Can stucco be applied right over the foam board without putting plywood covering the foam board? The design must take into account Colorado climate. Two photos are included one shows the idea for installing foam board. If foam board would work, can you recommend a certain type of foam board? Any idea what I should expect to pay per sq. ft. for stucco installation?