Re: Dwarf Alberta Spruce
It sounds like they have spider mites. It is not just the heat of the bricks, but also the poor air circulation that can make Dwarf Alberta spruce more vulnerable to spider mites. You might find success treating the spider mites with a frequent hard spray of water from the garden hose, but these spruce are probably planted in the wrong spot or at least too close to the building. Spraying with water will disrupt the spider mite life cycle without harming any predatory insects. It is very difficult to treat spider mites with insecticides as these tend to do more damage to their predators than the mites and actually tend to worsen outbreaks. Check out this spider mite factsheet from the Colorado State extension.
In general dwarf Alberta spruce should be planted where they will have good air circulation, and moist, well-drained soil. They do not do well in hot climates or urban areas. Make sure to water during dry spells to prevent drought stress. Check out this dwarf Alberta spruce factsheet from Ohio State for more detailed info.