I recently purchased a new home and I need to insulate a crawl space. Here is some background info on the home: its located in Dayton, Ohio, Cape Cod design built in 1940, has a full finished waterproofed basement under original structure, vented crawl space under an addition built in 1996. There is little to no insulation under this addition which is my kitchen. The crawl space floor is pea gravel covered with plastic. The hvac ducts are insulated. The floor above is 1/2" plywood covered with 3/4" hardwood flooring I just installed. The hardwood replaced 3/4" particle board covered with vinyl. This floor is super cold right now. The previous owner mentioned this was a problem. He installed a baseboard heater in the kitchen to make it more comfortable. I feel this is just a band-aid for an improperly insulated crawlspace. It appears someone started to insulate it but it looks like they were installing it wrong to start with. The paper is facing down and they nailed it to the floor joist. This crawl space stays dry except for one little puddle which is either a plumbing leak or a vent leak. The puddle is always in front of a vent that is under a small porch. How should I insulate? Leave the space vented and insulate the floor, or seal it up and insulate the walls. I can easily heat this area because of the existing vents and there is also a boarded up window that accesses the original basement. I've attached a few pictures. There is plastic dryer duct going to one of the vents. It seems that this could be a fire hazzard. Should I replace this with a hard duct while I'm doing my insulating? I done some research on crawlspace insulating on the web but there are a lot of conflicting opinions. I just want to do this right the first time without causing any other problems. Also the door that you use to access the crawlspace is just a piece of plywood. I'm assuming I should try to beef this up some and add weather stripping.