Great Northern Insulation 3730 Disher in Ridgeway in Ridgeway 10/10 Added R30 to ceilings in house & garage. About 1 month ago, Added R30 to the house attic to raise it to R60 & put R30 in the garage. Chris & Sean were efficient, polite & very informative. Helped me look in the attic afterwards. Job Price Was this review helpful?