hello, i am a renter of an OLD house. our kitchen has the built-in cabinets that go right up to the ceiling with the little turn knob locks. when you stand in front of the cabinets you can feel cold air radiating from underneath and the interior of the cabinets is COLD. I'm obviously losing a lot of heat through this corner of the house. you can see little holes of daylight under the kitchen sink. i was thinking of getting the rigid foam insulation boards to line the back of the cabinets and put strips under the front bottom where the toe-kick is. my questions... is this type of insulation safe to use inside the cabinets near my food? i can't see why it wouldn't be but don't know for sure. also, how can i cover it to make it not look like insulation in the cabinets? i was thinking of just getting contact paper. would this work? i don't want to do it and then find out the glue breaks down the foam or something. it doesn't need to be beautiful as it is inside the cabinets. i want to do this as cheap as possible. thanks!