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The building envelope should completely surround the conditioned space and the insulation needs to be in contact with the air barrier.
Spray foam attic floor. Polyurethane or polystyrene spray foams can provide thorough coverage to roof rafters and attic walls in much less time than is needed for other materials. Spray foam comes in two flavors open cell and closed cell and provides both parts of the building envelope the insulation and the air barrier. That makes the surface of the spray foam cooler possibly even below the dew point. Then you can use other forms of insulation like fiberglass or cellulose to add r value now that you have a tight air seal.
Removing the attic floor insulation will solve this problem. Spray foam insulation is an insulating air barrier material that works by sealing the walls floors and ceiling cavities from airflow. The attic is much warmer than outdoors in winter but significantly cooler than the living space if you leave the old insulation in the attic floor. One of the most common reasons to put spray foam on the roofline is to avoid having to air seal the attic floor because the attic is connected with the air in the house and indoor air is more humid than outdoor air which can cause moisture problems.
Install the spray foam to meet or exceed code required r values or add additional loose fill or batt fibrous insulation over the 1 inch of spray foam insulation to levels that meet or exceed the current adopted building energy codes. Unlike solid insulation products that require careful measurement cutting and fitting spray foam can cover even the most uneven surface instantly. That gives you the chance to maximize your energy bill savings while spending the least on the project. Install a minimum of 1 inch of spray foam insulation over the attic floor to provide a continuous air control layer.
This foam can be placed around light fixtures electrical outlets windows and doors attics and crawl spaces.
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