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This section provides an overview for airtight sheets as well as their applications and principles. Also, please take a look at the list of 4 airtight sheet manufacturers and their company rankings. Here are the top-ranked airtight sheet companies as of April, 2026: 1.AS ONE Corporation, 2.Seadam Co., Ltd., 3.Mitsubishi Chemical Corporation.
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Categories Related to Airtight Sheets
An airtight sheet is a residential plastic-based moisture-proof film used to construct the airtight layer of a moisture-proof, airtight construction, such as a house.
It plays a role in preventing indoor air and moisture from moving to the exterior wall. During construction, it is important to use sheets in such a way as to minimize the number of seams.
Airtight sheets that have passed tests for moisture permeability, strength, durability, and tearing strength with tacker nails have been certified.
In addition to airtight sheets, other types of airtight materials include plastic moisture-proof film for housing, moisture-permeable waterproof sheets, plywood, gypsum board, and plastic insulation materials (foamed plastic heat insulators).
Airtight sheets are used in different ways depending on the type of insulation method. The types and uses of airtight sheets are as follows:
In the filling insulation method, insulation is used in the gaps between columns, beams, and other spaces in the wall. Fiber-based insulation materials (glass wool, rock wool, etc.) are used in this method.
Since moisture reduces its effectiveness, airtight sheets (moisture-proof film) are applied to the interior side of the insulation material and moisture-permeable waterproof sheets are applied to the exterior to make it airtight and prevent condensation.
In the exterior insulation method, insulation is used on the outside of the pillar and beam framework. In this method, plastic insulation (in board form) is used. To make it airtight, airtight sheets may be installed, joints may be treated with airtight tape, or a combination of both may be used.
If there are joints in the airtight sheet, airtight tape, airtight gaskets, or other airtight aids are used to ensure that the airtight sheet is not severed at any point.
Airtight sheets play a role in reducing the ingress of water vapor from the room into the wall, protecting the airtight environment and building materials from condensation, and improving dew-proofing performance. When installing a damp-proof, airtight sheet, a damp-proof, airtight sheet is installed on the interior side. It is important to create an unbroken boundary between spaces.
In addition to securing an overlap of 30 mm or more between the airtight sheet and the ceiling and walls, the airtight sheet should be held in place by fastening it with a tacker, sandwiched with a holding material, or fastened with airtight tape. Insulation construction is basically divided into "moisture-proof layer," "air-proof layer," and "ventilation layer" from the interior side.
The airtight sheet is installed under the interior material of the "moisture-proof layer." The unit for moisture permeability of an airtight sheet is [m2-s-pa/ng], and the higher the value, the less moisture will pass through. The material composition of airtight sheets can be a single film made of a single plastic material or a composite film made of a single film combined with a film or plastic with different properties.
Variable airtight sheet, also called moisture-tight sheet or moisture control sheet, is characterized by its ability to change its resistance to moisture permeability in response to ambient humidity, allowing moisture to permeate into the room. This prevents summer condensation from occurring due to moist air outside the room caused by the temperature difference between the air-conditioned room and the outside air in the summer.
Airtight sheets are an important material for making a house highly airtight and insulated to achieve a high-performance house. However, there are some disadvantages associated with the installation of airtight sheets.
1. Condensation Forms Inside the Walls
When installing airtight sheets, it is necessary to work carefully to completely eliminate any gaps. This is because even a small gap will allow moisture to enter the wall.
Once moisture enters, it cannot move out of the wall because of the airtight sheet. As a result, condensation will form inside the walls and mold will grow on the insulation and other materials.
Mold inside the walls not only corrodes the pillars and beams but also deteriorates the insulation, so care must be taken. Since earthquake resistance and insulation performance will deteriorate, it is important to install airtight sheets so that there are no gaps.
2. Air Tends to Be Trapped
If a lot of sunlight shines into the house in the summer, the airtight sheet prevents hot air from escaping, and the inside of the house may become hot. When odors occur, it is easy for the odors to become trapped. In addition, heaters that emit exhaust into the room, such as oil heaters, are dangerous because they produce carbon monoxide.
Under these conditions, windows must be opened for ventilation, but the performance of airtightness and insulation is reduced, and the benefits of high-performance housing are dampened. Therefore, the key to maintaining a comfortable life in a house with airtight sheets is to use air conditioning effectively and efficiently to ventilate the house.
*Including some distributors, etc.
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Soudal, founded in the UK in 1966, is a manufacturer of sealants, PU-Foams and adhesives. The company’s product portfolio includes silicone sealants, acrylic sealants, and specialized sealants for construction, automotive, and industrial needs, and polyurethane (PU) foam products that are used to provide thermal insulation, soundproofing, and gap-filling properties, making them ideal for construction and HVAC industries. The company has 20 manufacturing sites on 5 continents and 64 subsidiaries worldwide.
Mitsubishi Chemical Corporation was founded in 1933 and has a head office in Tokyo, Japan. Mitsubishi Chemical Corporation provides products including chemicals, industrial gases, and health care products to customers globally. Mitsubishi Chemical Group’s performance products division manufactures and distributes. functional food materials, electronic and electrical components, specialty chemicals, and other products. Mitsubishi Chemical health care products include pharmaceuticals, drug discovery solutions, diagnostic reagents, and instruments for medical use. Mitsubishi Chemical Corporation also provides other services such as engineering, information systems, logistics, and consulting.
AS ONE Corporation, established in 1962, is a Japanese supplier of laboratory instruments and consumables, headquartered in Nishi Ward, Osaka. Through their website, AXEL GLOBAL, the company offers a selection of 3 million products. These include physical and chemical science instruments such as universal and measuring instruments, as well as laboratory instruments for cultivation, separation, and analysis. They also provide research facility equipment such as storage equipment and laboratory chairs. AS ONE extends its offerings to include industrial instruments like dehumidifying storage and organization and conveyance equipment. Additionally, AS ONE serves the healthcare sector with products for hospitals and nursing homes.
Ranking as of April 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | AS ONE Corporation |
33.3%
|
| 2 | Seadam Co., Ltd. |
25.0%
|
| 3 | Mitsubishi Chemical Corporation |
25.0%
|
| 4 | Soudal |
16.7%
|
Derivation Method
The ranking is calculated based on the click share within the airtight sheet page as of April 2026. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
Japan
|
3 | 75.0% |
|
United Kingdom
|
1 | 25.0% |
61 products found - Page 2
61 products - Page 2
House Depot Japan Co., Ltd.
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■Tyvek® Silver was developed with the concept of heat shielding homes in mind. You can rest assured that the heat shielding function of the Tyvek® ...
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■Ideal for preventing drafts around electrical outlets This is an aftermarket airtight outlet cover. Prevents water vapor, dust, and air from enter...
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■Improve airtightness around electrical outlets Ideal for sealing around electrical outlets. It has a carefully designed shape and is highly airtig...
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For various uses such as industrial and agricultural purposes Our company carries out integrated production in-house. Therefore, we ask that you p...
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■Ensuring airtightness between the top of the foundation and the foundation Ideal for airtight treatment between the top of the foundation and the ...
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■Ensure airtightness between the 2×4 floor and wall Ideal for airtight sealing between 2x4 floors and walls. The EPDM packing maintains airtightnes...
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■For airtightness in areas that are difficult to install, such as around pipes and curved surfaces. Ideal for air-tightening curved surfaces such a...
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■Ensure airtightness around windows Ideal for airtight treatment mainly around windows. The EPDM packing maintains airtightness and follows the dry...
House Depot Japan Co., Ltd.
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■Sash bottom frame - Prevents water leakage from the sash bottom frame. ・A lineup of 3 sizes that correspond to the sash frame length ~43mm, ~53mm...
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■Keeps the foundation and foundation airtight and stops moisture. This is an airtight packing for the foundation and foundation when insulating the...
Paramount Glass Industries Co., Ltd.
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Super weatherproof moisture-proof sheet that prevents heat deterioration. ■Features It has excellent moisture resistance and blocks water vapor ge...
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■Airtight packing for base with integrated moisture-permeable waterproof sheet This is an airtight packing for the foundation and foundation when i...
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■Sheet-integrated base airtight packing This is an airtight packing for the foundation and foundation when insulating the foundation. Since the bas...
Nippon Jukenkyo Co., Ltd.
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■High-density packing improves airtightness and durability This is an airtight packing for the foundation and foundation when insulating the founda...
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■Butyl double-sided type Butyl airtight tape. Ideal for areas where airtightness is important, such as the joints of moisture-proof sheets and arou...
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■Aluminum vapor deposition maintains adhesion Butyl airtight tape. Ideal for areas where airtightness is important, such as where moisture-proof sh...
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■Tape for extremely cold regions with a focus on low-temperature adhesion Acrylic airtight tape. Ideal for areas where airtightness is important, s...
Nippon Jukenkyo Co., Ltd.
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■Excellent product with both strength and ease of cutting by hand. Acrylic airtight tape. It has high strength due to the use of a special base mat...
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■Acrylic double-sided type that can be cut by hand Acrylic airtight tape. Ideal for areas where airtightness is important, such as areas where the ...
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■A versatile tape with excellent followability and a wide variety of types Acrylic airtight tape. Ideal for areas where airtightness is important, ...
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■Heatproof airtight sheet with aluminum vapor deposition This is a moisture-proof and airtight sheet for indoor walls, ceilings, and roofs made of ...
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■High-performance sheet that increases the airtightness level of houses and prevents moisture This is a moisture-proof and airtight sheet for indoo...
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■High-performance sheet that increases the airtightness level of houses and prevents moisture This is a moisture-proof and airtight sheet for indoo...
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■High-performance sheet that increases the airtightness level of houses and prevents moisture This is a moisture-proof and airtight sheet for indoo...
