i need help evaluating a proposal i recently got to insulate the converted attic on my one-story bungalow-type house, as well as the walls of the house itself. the footprint of the place is 31' by 42'. I live in the northeast. Here's what the contractor gave me:

remove/dispose of existing knee-wall insulation: $337

install r-13 fiberglass knee-wall insulation: 771

air seal knee-wall and floor: 125

insulate & lock 4 knee-wall doors: 187

air-seal sills, open bays, pipes, wires in & attic

& basement: 250

Dense pack cellulose r-19, 2nd floor slopes: 625

dense pack cellulose r-11, 2nd floor gable walls: 245

dense pack cellulose r-11, 1rst floor walls: 1221

overhead, profit, insurance: 673

total cost: 4,434

what do you think of this? are there any questions i can answer that'll help you help me evaluate the proposal? and is it normal for a contractor to break out "overhead, profit, insurance" the way this fellow has?

one thing that concerns me is that the attic has absolutely ZERO ventilation -- ie no vents anywhere -- and this contractor swears that by his method of sealing up the converted space, i don't need any. does that make sense?

thanks for any help you can give. i'm rather lost at sea in all this.