Blown in Cellulose insulation in pre-exisitng house
I had contracted an insulation company (recommended by the energy auditor and builder friend) to insulate my house walls because during the energy audit, my walls showed little or no insulation ( I live in Maine).
The insulation company performed pre-eliminary check to determine the area and gave me the quote. The contract clearly mentions that during insulation (dense packed cellulose insulation), the interior walls may sag and the company will not be liable for it.
However, during pre-discussions, the general condition of house looked good and we didn't expect any issues.
On the day of insulation, the worker drilled holes in the outside walls, and then started the insulation process on north side of the house. When we waalked into the rooms, one wall had blown out of the seam , and the other wall had sagged, and there was cellulose all over the floor.
I had him immediately stop the process and vaccuum the insulation to release the pressure.
On inspection, it was found that my house( it is 50 years old) interior walls are 3/8 of an inch thick. They suspect that thin walls caused this issue.
But then upon further discussion, it turns out that the worker had drilled holes only at the bottom of the exterior walls and not on the top of the exterior walls. When I shared that the process is to drill holes at the bottom and at top, the worker said it was labour intensive and he generally drills holes only at bottom and can insulate the entire wall section between two studs through that one opening.
I saw the 'This Olde House videos' later and see they too mention drilling two holes.
what does this forum advise?
frustrated in Maine