Air Seal Attic Plane

The air barrier used to isolate the living space from the attic is usually the taped drywall while the thermal barrier is the insulation placed on top of the drywall. Pray that the installer used finish nails and not say ring shank nails. Install drywall then seal the seam from the attic side with caulk foam or drywall adhesive but not other construction adhesives.

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Attic Insulation Is Most Effective When You Air Seal The Attic Plane After You Air Seal Install Insulation To An Energ Energy Audit Air Seal Attic Insulation

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Seal fireplace and furnace holes.

Air seal attic plane.

It s easy to overlook electrical wires ducts pipes and vents in the attic but the openings around these are holes can compromise the air sealing of your attic. Carefully pull down the finish trim. By air sealing in your attic you can stop many major air leaks and help to maintain the desired temperature throughout your home. How to insulate and air seal an attic access hatch.

Combined with attic insulation air sealing can help to alleviate the formation of dangerous ice dams in the winter. Seal attic floor holes. For larger holes filler material may be needed. The attic is usually where you can find some of the largest opportunities to save energy in your home.

The step of air sealing the attic plane has been a building code requirement for new construction homes for almost 20 years. I ll try to explain how you can seal air leaks in a conventional vented unconditioned attic. Air seal drywall to top plates at all attic wall interfaces to minimize air leakage. Equally important is the need to air seal the attic plane after the vermiculite is removed and before the new insulation is blown in.

Air sealing vented attic in new construction during an energy audit of my home the auditor suggested to create a good attic plane seal by removing all of the existing insulation put down a 1 2 layer of spray foam insulation and go back with blow in insulation to the preferred r value. To seal these openings use caulk or spray foam. Although many gba articles address aspects of attic air sealing no single article provides an overview of the topic. Typically the ceiling is not a single horizontal plane but a series of horizontal planes vertical planes knee walls and sloped planes all intersecting to create the ceiling.

This article is an attempt to provide that missing overview. Air seal the trim the first step is air sealing the finish trim and enclosure around the attic hatch. Scope air seal drywall to top plates at all attic wall interfaces to minimize air leakage. If your house has cathedral ceilings that is insulated sloped roof.

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