We live in a mobile home in South Western ON, about 30 miles from Port Huron MI. The home is 10-15 years old, there is no foundation, it rests on concrete blocks with skirting on all four sides. The insulation & bladder under the home are in good condition. A company has been soliciting business in our mobile home park with an energy saving measure. They insulate all the skirting with high density styrofoam. Our concern is that all venting is removed. Should we be concerned with this? Is it truly an energy efficient form of insulating? Any input on this issue would be greatly appreciated.