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It depends on where you live and what comfort level you are looking for. In Maryland and Virginia, the recommended minimum R-value is R38 for attics. To learn more, check out the Department of Energy’s guide to insulation: Guide To Insulation
No! A big benefit of blown-in insulation is that it can be blown on top of existing insulation in your home, saving you money by utilizing what is already there. The only reason we would recommend removing existing insulation is if it has been contaminated by feces from mice, bats, or other wildlife.
First we will remove any existing pests from your attic. Once all pests are out of your attic, we will seal up your attic so they cannot reenter again. Then we will remove your contaminated insulation, sanitize as needed, and then install new insulation.
Energy savings through lower heatingandA/C bills. Poorly insulated attics will allow hot air from attics in the summer to warm your home which makes your A/C run more. Conversely, in the winter, heat will escape from your home up through the attic making your heating system run more. Properly insulated attics are one of the best ways to make your home more energy efficient and save money on your utility bills.
In the Mid-Atlantic area, the required code for insulation in attics is R-38, which is approximately 11-12" of blown insulation. We use cellulose blown in insulation which has advantages over fiber glass. The price to insulate attics to code greatly depends on whether the existing insulation must be totally replaced or simply topped off. Insulation wears out or may become contaminated over time and may need replacement. Our inspection will determine the correct solution and provide a firm quote. Generally, blown in attic re-insulation prices are $1,200-$15,000 and depend on total square footage. This price does not include attic air sealing and ventilation services which may be needed and costs between $350 to $1,500. CLICK HERE to see a complete list of average blown-in insulation prices.
So, what are the major differences between cellulose insulation and fiberglass insulation? “R-Value” measures how strongly a material resists the flow of heat. Higher R value means better insulation. Cellulose attic insulation works by blocking air flow. Fiberglass attic insulation works by trapping air flow. When moving between your unconditioned attic and your living space blocking air flow is better. If green products are important to you, go with cellulose. It is simply recycled paper products treated with a flame retardant and boric acid. Cellulose has less safety warnings than fiberglass. The price of both cellulous and fiberglass blown in insulation is similar. Cellulose insulation is treated with boric acid – an effective pest deterrent- especially in your attic! Most insects will avoid boric acid since it kills them. We use cellulose.