indoor growing problems

Hello I am a semi first time grower. I have grown multiple plants from seeds to the start of the budding process, but never the whole way through. Well this year I am and my situation is an old fruit celler in the basement underneath the stairs. my main problem is the rafters on the ceiling are open, so the smell just drifts right up into my kitchen. does anyone have any suggestions as what kind of material I should use to stuff the ceiling and i would also like to cover the walls. i dont want a filter or ionizer answer. I would like to know if i should cover them with wood, plastic, styrofoam or what. Please help and thanks so much.