I just bought a 1935 house in Mississippi, and I'm dealing with a kitchen/pantry/laundry extension that has a low-slope roof. There's no attic, no vents, and no insulation, which has led to the ceiling hitting 100°F already in May. I found out I don't have interior access to the ceiling cavity, so I'm considering removing the 18' fascia board and blowing in dense-packed cellulose insulation from the outside. My plan is to first remove the fascia, then seal any gaps with foam or caulk, blow the insulation into the rafter bays, and finally reinstall the fascia. I'm aware that it's an unvented cavity, so I have to be cautious about moisture risks if it's not air-sealed. I'm also unsure whether the rafter bays are open or blocked. I'm looking for any advice on this method. Has anyone tried this approach, or do you have better suggestions?
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