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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 February, 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 February 2026
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | AS ONE Corporation |
37.5%
|
| 2 | Seadam Co., Ltd. |
25.0%
|
| 3 | Mitsubishi Chemical Corporation |
25.0%
|
| 4 | Soudal |
12.5%
|
Derivation Method
The ranking is calculated based on the click share within the airtight sheet page as of February 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
61 products
Nagai Co., Ltd.
410+ people viewing
Last viewed: 9 hours ago
■ Moisture-proof in winter and breathable in summer while ensuring airtightness A variable moisture permeability/airtight sheet made of spunbond no...
JFE Rock Fiber
680+ people viewing
Last viewed: 9 hours ago
Airtight subsidy material ･ JIS A 6930 B type B type ･ Plastic moisture -proof film ■ Characteristics ･ If you cover the entire building with a m...
2 models listed
Paramount Glass Industries Co., Ltd.
440+ people viewing
Last viewed: 1 day ago
Moisture control function: moisture-proof in low-humidity environments and moisture-permeable in high-humidity environments. ■Features Humidity Co...
House Depot Japan Co., Ltd.
330+ people viewing
Last viewed: 1 day ago
■While ensuring airtightness, it is moisture-proof in winter and breathable in summer. VCL Smart® is a renewal product of "Tyvek® Smart". While ens...
Jaybeck Co., Ltd.
310+ people viewing
Last viewed: 23 hours ago
Waterproofing and airtighting around pipes, which are prone to water leaks, is surprisingly difficult, and airtight tape alone will not work. Pipe ...
Japan Aqua Co., Ltd.
440+ people viewing
Last viewed: 2 hours ago
■Features ■High airtightness and followability Due to its excellent flexibility, it can easily follow joint variations (changes) and exhibits high ...
2 models listed
Nagai Co., Ltd.
390+ people viewing
Last viewed: 1 hour ago
■Moisture-permeable, waterproof, and heat-shielding sheets that make your home last longer DuPont™ Tyvek® Silver is a moisture-permeable and waterp...
Paramount Glass Industries Co., Ltd.
350+ people viewing
Last viewed: 7 hours ago
Moisture-tight sheet for 1 span. ■Features A moisture-proof polyethylene film with a sheet width of 555mm. Of course, it can also be used for repa...
Nippon Jukenkyo Co., Ltd.
450+ people viewing
Last viewed: 11 hours ago
■ Fits various sash thicknesses and blocks rainwater and condensation water from leaking around windows. We have clarified the workability for the ...
House Depot Japan Co., Ltd.
290+ people viewing
Last viewed: 1 day ago
■Achieves a strong and long-lasting roof with both excellent moisture permeability and high durability Tyvek® Roof Liner is a breathable roofing ma...
![Waterproof layer: Moisture-permeable waterproof with heat shielding performance Josheets LT Silver 10 [Personalized item]-Nippon Jukenkyo Co., Ltd.](https://metoree.s3.ap-northeast-1.amazonaws.com/img/products-new/30026542024083160.png)
Nippon Jukenkyo Co., Ltd.
380+ people viewing
Last viewed: 9 hours ago
■Thoroughly prevents condensation inside walls with performance that meets JIS standard values (Class B) + heat shielding effect In addition to m...
Jaybeck Co., Ltd.
330+ people viewing
A JIS A-6930 residential plastic moisture-proof film manufactured in a first-class factory with high quality control. The key to airtightness is th...
Japan Aqua Co., Ltd.
340+ people viewing
Last viewed: 9 hours ago
■Features - Prevents water and wind from entering from outside, extending the lifespan of the house. ・Prevents condensation by letting moisture in...
2 models listed
Ace Industry Co., Ltd.
420+ people viewing
Last viewed: 9 hours ago
This is a product in which airtight film and airtight tape are wrapped over a masker. ■Usage example ・1F ceiling and 2F floor meeting area ・2F w...
Nagai Co., Ltd.
380+ people viewing
Last viewed: 1 hour ago
■Roof base material that suppresses condensation in the attic and contributes to creating a comfortable home. In addition to being moisture permeab...
Mag Isobert Co., Ltd.
380+ people viewing
Last viewed: 6 hours ago
A moisture-control airtight sheet that has both moisture-proofing and moisture-permeable properties and manages moisture within the building struct...
Nippon Jukenkyo Co., Ltd.
450+ people viewing
Last viewed: 3 hours ago
■Thoroughly prevents condensation inside walls with performance that meets JIS standard values (Class B) + heat shielding effect In addition to m...
Ace Industry Co., Ltd.
290+ people viewing
Last viewed: 9 hours ago
This product is pre-packaged with single-sided butyl adhesive tape. At construction sites, it can be expected to save labor on site work and reduce...
Japan Aqua Co., Ltd.
880+ people viewing
Last viewed: 9 hours ago
■Features ・Heat shielding ・Single-sided aluminum ■Product guaranteed for 10 years with reliable waterproof performance ・Special processing allo...
Jaybeck Co., Ltd.
300+ people viewing
It is not easy to maintain waterproofness and airtightness around windows over the long term. Waterproofing is surprisingly difficult, and waterpro...
Wintex Co., Ltd.
590+ people viewing
Last viewed: 9 hours ago
For various uses such as industrial and agricultural purposes Our company carries out integrated production in-house. Therefore, we ask that you p...
Japan Aqua Co., Ltd.
350+ people viewing
Last viewed: 5 hours ago
■Product guaranteed for 10 years with reliable waterproof performance ・Prevents condensation by allowing moisture inside the wall to escape. - Pre...
2 models listed
House Depot Japan Co., Ltd.
320+ people viewing
Last viewed: 1 hour ago
■Features ・"JIS A 6111" for moisture-permeable waterproof sheets has been revised, and moisture-permeable waterproof sheets for roofs (moisture-pe...
Nippon Jukenkyo Co., Ltd.
310+ people viewing
Last viewed: 5 hours ago
■Easily block pinholes in inside corners Ideal for air-tightening indoor corners. It is easy to install and eliminates the hassle of taping the ins...
Nippon Jukenkyo Co., Ltd.
350+ people viewing
Last viewed: 2 hours ago
■ Easily and reliably seal the edges, which is surprisingly difficult. When installing insulation with a moisture-proof sheet, you can easily and r...
Nippon Jukenkyo Co., Ltd.
440+ people viewing
Last viewed: 1 hour ago
■Integrated corner material that blocks pinholes in the sash When used in conjunction with a window shield, it completely blocks rainwater from ent...
House Depot Japan Co., Ltd.
430+ people viewing
Last viewed: 1 day ago
■Drainage function added to Tyvek R house wrap Tyvek R Drain Wrap is a moisture-permeable and waterproof sheet with a drainage function that is ide...
Nippon Jukenkyo Co., Ltd.
360+ people viewing
Last viewed: 1 day ago
■A versatile item that can be separated and used for multiple purposes. It can be used not only around 3.5-inch square columns on ceilings and floo...
Nippon Jukenkyo Co., Ltd.
380+ people viewing
Last viewed: 11 hours ago
■Integrated corner material to block pinholes in corners Completely blocks rainwater from entering through pinholes at various three-sided intersec...
House Depot Japan Co., Ltd.
410+ people viewing
Last viewed: 12 hours ago
■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® ...
