Re: Insulating 1 1/2 story bungalow roof
Since you're doing the roof as well .... here's a suggestion.....
once the shingles are off and any repairs to the decking are completed ....
lay down 2 inch rigid foam over the entire deck.
Over the rigid foam lay down 2x4's on the flat .... using long screws fasten these to the rafters below.
Then apply a new roof decking to these sleepers and apply the shingles with a ridge vent at the peak.
What you end up with is the air space for the shingles .... most importantly .... you have a continious thermo break from the roof.
If you require an air space for the shingles do the above .... otherwise .... just fasten the new sheathing directly over the rigid foam.
Apply the insulation to the rafters on the inside and you have improved the performance with the thermobreak on the top side. This will improve keeping the heat out in the summer and keeping the heat in during the winter.
Just a thought.
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