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Atiic insulation for the DIYer

According to theEnergyStar™ Program, heating and cooling costs can be slashed by upto 20% per year by properly sealing and insulating the home. Insulating theattic should be a top priority for preventing heat loss because as heat rises, a critical amount of heat loss from the living areas of the home occurs through an unfinished attic.  During the summer months, heat trapped in the attic can reduce a home’s ability to keep cool, forcing occupants to further tax the home's cooling system.
The aim should be to insulate the living space of the house whileallowing the roof to remain the same temperature as the outside. This prevents cold outside air from traveling through the attic and into the living area of the home. In order to accomplish this, an adequate venting system mustbe in place to vent the roof by allowing air flow to enter throughsoffit-intake vents and out through ridge vents, gable vents or louver vents.
If there is currently a floor in the attic, it will be necessary to pull up pieces of the floor to install the insulation. In this case, it will be easier to use a blower and loose-fill insulation to effectively fill the spaces between the joists.
When installing fiberglass insulation, make sure that you wear personal protective equipment, including a hat, gloves, and a face mask,as stray fiberglass material can be inhaled and cause irritation to the lungs,eyes and exposed skin.
Before you begin actually installing the insulation, there is some important preparation involved in order to ensure that the insulation is applied properly to prevent hazards and to achieve maximum effectiveness.
Step 1: Install RoofBaffles
In order to maintainthe free flow of outside air, it is recommended that polystyrene or plasticroof baffles are installed where the joists meet the rafters. These can be stapled into place. 
Step 2: Place BafflesAround Electrical Fixtures
Next, place baffles around any electrical fixtures (lights, receptacles, etc.), since these may become hot while in use. Hold the baffles in place by cross-sectioning the rafters with 2x4s placed at a 3-inch clearance around the fixture.  Cut the polystyrene board to fit around the fixture and inside the wood square you have just created.
Step 3: Install a Vapor Barrier
If you are installing insulation with a vapor barrier, make sure itfaces the interior of the house. Another option for a vapor barrier is to take sheets of plastic and lay them between the ceiling joists.  Then,using a staple gun, tack them to the sides of the joists.
Step 4:  Apply the Insulation
Begin by cutting long strips of fiberglass to measure, and lay them in between the joists. Do not bunch or compress the material; this will reduce the insulative effect.
If you are not planning to put in an attic floor, a second layer of insulation may be laid at90º to the first layer. Do not lay in a second moisture barrier,as moisture could potentially be trapped between the two layers. This second layer of insulation will make it easier to obtain the recommended R-value. Incolder climates, an R-value of 49 is recommended for adequate attic insulation.In warmer climates, an R-value of 30 is recommended. Fiberglass insulation has an R-value of rough  3 per inch of thickness; cellulose  has an R-value of roughly 4per inch, but it doesn't retain its R-value rating as well as fiberglass.
If an attic floor is in place, it will be easier to use a blower to insert cellulose insulation into the spaces. The best way to achieve this is to carefully select pieces ofthe floor and remove them in such a manner that you will have access to all ofthe spaces in between the joists. Run the blower hose up into the attic. A helper may be needed to control the blower. Blow the insulation into the spaces between the joists, taking care not to blow insulation near electrical fixtures. Replace any flooring pieces that were removed.
Loose-fill insulation, either fiberglass or cellulose, is also a good option in cases where there is no attic floor. In such circumstances, you won’t need a blower, and can simply place the insulation between the joists by hand. You may also wish to even out the spread with a notched leveler.
When inspecting an attic, ensuring that there is a free flow of outsideair from the soffits to the roof vents is key to a well-functioning insulation system. The lack of adequate ventilation in insulated attics is a common defect. When inspecting the attic, look behind the baffles to see if there isany misplaced insulation obstructing the natural air flow, and check the roof vents to make sure that outside air is exhausting properly. Check for a moisture barrier under the insulation.  Also, look for spots where the insulation is compacted; it may need to be fluffed out.  In the case of loose-fill insulation, check for any thinly spread areas that may need topping up. Finally, look for dirty spots in the insulation where incoming air is admitting dust into the material.

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