Here is a good website to reference for foam insulation:
http://energy.gov/energysaver/types-insulation
Types of Liquid Foam Insulation
Today, most foam materials use foaming agents that don't use ... read more
What causes large gaps between window frames and the brick of my home? It looks like someone tried to caulk it previously, but it just pulled away again.
Gaps are typically caused by different expansion and contraction rates of different types of materials at different temperatures. The frame of the window may be vinyl or wood, which expands at differ ... read more