Larry writes from Reisterstown, Maryland: "My house was built in 1983 with blown-in insulation in the attic. Can I put rolled insulation on top of the blown-in insulation or do I need to have more blown-in insulation added?"

Answer: You can roll insulation over existing blown-in insulation but keep in mind that compressing the blown insulation will cause a loss in R value. Either the weight of the new insulation or foot traffic while installing may affect the blown insulations R-Value. I recommend having more insulation blown in to avoid any headaches.