Any chance we could move the ash clouds to the North East?? As it stands now, too many Red states get smashed.
So, it would depend on what type of crop that could be grown. Grains like wheat and corn wouldn't make it. Peas and barley, might make it, depends on the cloud cover. Oats might make it also.
When my wife and I bought our new house, we insisted on a steep pitch, steel roof, with 12, NOT 16", space roof. We could take a few FEET of heavy, wet snow, and our roof would survive. I don't know what wet pummice weighs, but I bet it is an order of magnitude higher.
IIRC most deaths and damage when Mt. Penitubo blew was from collapsed roofs (most of which were not steep enough pitch) to allow ash to fall off.