Is my crawl space considered non-vented??
I live in the Chicago area in a house built in the 60s. It is a tri-level with a crawl space under the living room/kitchen. The access to the crawl space is from the lower level of the house. It is about 5' tall. There are no vents from the crawl space to the outside. There are uninsulated water/waste lines and HVAC ducts running in the crawl space. There is no insulation anywhere in the crawl space (under the livingroom/kitchen floor, on the exterior walls, or on interior walls). In the winter, the main floor floors are COLD and I know I am loosing heat where there are interior walls on the lower level that face the crawl space. The crawl space is not heated per-se but I am sure it gets heat from the unisulated heating ducts running in it.
So I know I need to insulate, but am not sure if I should treat it as a vented or unvented. What if I just insulated the heating ducts, the ceiling and against the intenal walls of the crawlspace? Or should I just do the external and internal walls of the crawlspace?
Thanks for any input!