We moved into our house in CT, built in 1977, about a year ago. The house has a vented crawlspace with a dirt floor that has recently been waterproofed. The crawlspace ceiling has R-19 fiberglass insulation (R-30 is recommended in our region), and there are leaks in the ductwork running through the crawlspace. Our problems are cold floors in winter and high heating and cooling costs.
We are looking into foam insulation for this space but aren't sure if we should do just the ceiling, just the walls, or both? I have read to do the ceiling in a vented space and the walls in an unvented space. Because the crawlspace has been waterproofed, should we permanently seal the vents and just add foam to the walls? We have received a few quotes from insulation contractors and they are suggesting we insulate both, but I'm wondering if that is just because they make more money that way!
Obviously, we want to get the most bang for the buck in this economy, and want to be more energy efficient and more comfortable in our home. Any advice would be greatly appreciated!!