My house has a false vaulted ceiling with a 4" gap between it and the roof. Unfortunately, whoever installed this ceiling neglected to install insulation in this gap.
However, I can access the gap from the attic and I do have enough clearance to slide things down the gap. My dilemma is how to best insulate this awkward area without taking down the false ceiling.
Here's a crude diagram of the location of the 4" gap (on the right):
And here is a photo of the actual gap taken from inside the attic looking down the 4" gap:
The gap is 4" wide, but given the fact there are nails sticking through from the roof, the minimum clearance is probably only 3".
I've had a couple ideas for how to approach this:
Rent a cellulose blower from Home Depot. The end of the blower duct will be too wide to fit down the gap, but perhaps I could blow in some cellulose, pack it in with a long rod and then blow in more cellulose behind it...?
Cut sheets of foam board to fit and then slide them down the gap. R value won't be great and thick sheets might snag on the roof nails while sliding them down, but at least there would be some sort of insulation.
Any other ideas or recommendations?