The best attic vapor barrier depends on the job: controlling moisture vapor is different from reflecting radiant heat. I’d put CertainTeed MemBrain first for moisture-focused projects because its smart-retarder design is more tailored to changing humidity than reflective foil products. For heat reflection, AtticFoil Original is the standout large-roll option, while ROBERTS 70-118 suits buyers who specifically need heavy polyethylene film. The main tradeoff is choosing between moisture control, radiant-heat performance, installation fit, and the requirements of your roof assembly. Read on for how the seven options compare and which type fits your attic.
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Key Takeaways
- MemBrain is the moisture-control pick, while the foil-faced rolls are intended for radiant-heat management; these products do not perform the same job.
- AtticFoil and Houseables offer broad 1,000-square-foot coverage, but roll width and installation layout can affect waste and handling.
- MemBrain comes in two listed formats: the 120-inch-wide roll favors broad coverage, while the 8-foot-wide format may suit layouts planned around narrower sections.
- ROBERTS is the clear polyethylene-film option; its 6-mil construction makes it a different choice from reflective barriers and smart vapor retarders.
- RadiantGUARD and US Energy Products add format alternatives, but buyers should verify the product’s intended assembly and installation method before treating any reflective roll as a vapor barrier.
| AtticFoil Original Attic Radiant Barrier, 48-Inch Wide, 1,000 Sq. Ft. |  | Best for Open-Frame Attics | Coverage: 1,000 square feet | Width: 48 inches | Material: Double-sided pure aluminum foil with internal tear-resistant fabric | VIEW LATEST PRICE | See Our Full Breakdown |
| CertainTeed MemBrain Smart Vapor Retarder, 120 in x 100 ft |  | Best for Humidity-Adaptive Moisture Control | Model: 902010 | Size: 120 inches x 100 feet | Wall height: 10 feet | VIEW LATEST PRICE | See Our Full Breakdown |
| RadiantGUARD Xtreme Radiant Barrier Attic Insulation, 542 sq ft, 26 in x 250 ft |  | Best for Narrow, Detailed Runs | Model: RG-X | Coverage: 542 square feet | Roll dimensions: 26 inches x 250 feet | VIEW LATEST PRICE | See Our Full Breakdown |
| CertainTeed MemBrain Smart Vapor Retarder, 8 ft x 100 ft | | Best for Standard-Width Interior Projects | Model: 902008 | Dimensions: 8 feet x 100 feet | Weight: 9.8 pounds | VIEW LATEST PRICE | See Our Full Breakdown |
| Houseables Radiant Barrier Insulation Roll, 250 ft × 4 ft, 1,000 sq ft |  | Best Value Coverage for Large Attics | Length: 250 feet | Width: 4 feet | Coverage: 1,000 square feet | VIEW LATEST PRICE | See Our Full Breakdown |
| US Energy Products 1000 sq ft Reflective Insulation Roll, 4 ft x 250 ft |  | Best for Large-Area Radiant Coverage | Coverage: 1,000 sq ft | Dimensions: 4 ft x 250 ft | Thickness: 8 mils | VIEW LATEST PRICE | See Our Full Breakdown |
| ROBERTS 70-118 Moisture Barricade Polyethylene Film Roll, 6 mil, 1,000 sq. ft. |  | Best for Flooring-First Moisture Control | Material: Polyethylene | Thickness: 6 mil | Coverage: 1,000 sq ft | VIEW LATEST PRICE | See Our Full Breakdown |
| attic vapor barrier | Material | Coverage |
|---|---|---|
| AtticFoil Original Attic Radia | Double-sided pure aluminum foil with internal tear-resistant fabric | 1,000 square feet |
| CertainTeed MemBrain Smart Vap | Clear | — |
| RadiantGUARD Xtreme Radiant Ba | Reinforced aluminum | 542 square feet |
| CertainTeed MemBrain Smart Vap | Plastic | — |
| Houseables Radiant Barrier Ins | — | 1,000 square feet |
| US Energy Products 1000 sq ft | Aluminum foil, Mylar, and woven polyethylene scrim | 1,000 sq ft |
| ROBERTS 70-118 Moisture Barric | Polyethylene | 1,000 sq ft |
More Details on Our Top Picks
AtticFoil Original Attic Radiant Barrier, 48-Inch Wide, 1,000 Sq. Ft.
The AtticFoil Original is the strongest fit here for an open-frame attic where a radiant barrier is the goal, not a conventional vapor barrier. Its perforated, double-sided aluminum reflects radiant heat while allowing moisture to pass through, and the tear-resistant internal fabric should make the wide sheet more manageable during installation. Included seam tape saves a separate sourcing step. Compared with the narrower RadiantGUARD Xtreme, its 48-inch width can cover larger sections with fewer runs; it also supplies nearly twice the coverage. The tradeoff is that this width is specifically suited to horizontal installation in open-frame attics, so it is a less flexible choice for tight or irregular spaces. Its claimed 97% radiant reflectivity addresses heat transfer, not every moisture-control need.
Pros:- Double-sided pure aluminum surface is designed to reflect radiant heat.
- Perforations allow moisture to pass through.
- Internal tear-resistant fabric adds strength during handling.
- Seam tape is included, and the roll covers 1,000 square feet.
Cons:- The 48-inch width is best suited to horizontal installation in open-frame attics.
- A radiant barrier is not a substitute for a vapor retarder where one is required.
- The 97% reflectivity figure is a product claim, not a measure of overall attic insulation performance.
Best for: Homeowners covering broad, open attic framing who want a perforated radiant barrier with tape included.
Not ideal for: Buyers seeking a dedicated vapor-control membrane or working in narrow, obstructed attic spaces where the 48-inch width is awkward.
- Coverage:1,000 square feet
- Width:48 inches
- Material:Double-sided pure aluminum foil with internal tear-resistant fabric
- Perforated:Yes; allows moisture to pass through
- Reflectivity:97% claimed
- Included components:AtticFoil insulation and foil tape
- Model number:1000AK2FT1
Our verdict“Choose AtticFoil for broad, open attic runs where you want a reinforced, perforated radiant barrier rather than a dedicated vapor-control sheet.”
CertainTeed MemBrain Smart Vapor Retarder, 120 in x 100 ft
CertainTeed MemBrain, 120 in x 100 ft is the lineup’s clearest choice for moisture management rather than radiant-heat reflection. Its humidity-responsive permeance is designed to limit moisture entry during winter and allow cavity moisture to escape in summer, a different job from the aluminum barriers such as Houseables Radiant Barrier. The 120-inch width can suit projects planned around 10-foot wall heights and may reduce horizontal seams compared with narrower sheets. It is intended for use with unfaced insulation where a vapor retarder is required, so I would not treat it as a universal attic covering. The main compromise is its specified wall-oriented format: buyers insulating varied attic surfaces may find the tall, wide sheet less convenient than a roll designed for attic framing.
Pros:- Changes permeance in response to humidity conditions.
- Designed to limit winter moisture entry and permit summer drying.
- 120-inch width corresponds to the listed 10-foot wall application.
- Installs like polyethylene sheeting.
Cons:- Intended only for assemblies where a vapor retarder is required.
- The 10-foot-wall format may be inconvenient for other dimensions or attic layouts.
- Unlike perforated foil barriers, it is not presented as a radiant-heat reflector.
Best for: Builders or renovators using unfaced insulation on 10-foot walls in a climate and assembly where a vapor retarder is specified.
Not ideal for: Attic owners seeking a radiant barrier, or anyone whose project does not call for a vapor retarder or does not match the wall-height format.
- Model:902010
- Size:120 inches x 100 feet
- Wall height:10 feet
- Material:Clear
- Insulation compatibility:Unfaced insulation
- Moisture response:Permeance adapts to changing humidity
Our verdict“Pick this wide MemBrain roll for specified moisture control in 10-foot wall assemblies, not as a reflective attic barrier.”
RadiantGUARD Xtreme Radiant Barrier Attic Insulation, 542 sq ft, 26 in x 250 ft
The RadiantGUARD Xtreme earns its place for attic layouts where a narrower strip is easier to position than a full-width sheet. At 26 inches wide, it can be cut with common tools and stapled to rafters, giving DIY installers a workable format for smaller runs and varied surfaces. Its 542-square-foot coverage is substantially less than the 1,000-square-foot rolls from AtticFoil and Houseables, so it is better matched to a focused project than a large attic. The product lists reinforced aluminum, fiber-free construction, and a Class A/Class 1 fire rating. These details do not make installation effortless: a staple gun and careful placement are still needed. Also, the supplied description does not substantiate its temperature or utility-bill reduction claims.
Pros:- Narrow 26-inch roll can suit smaller or more detailed attic runs.
- Reinforced aluminum is described as fiber-free and non-toxic.
- Can be cut with utility scissors or a hacksaw.
- Listed as Class A/Class 1 fire rated.
Cons:- 542 square feet of coverage is much less than the 1,000-square-foot AtticFoil and Houseables rolls.
- Installation requires a staple gun and hands-on fitting.
- Temperature and utility-bill savings claims are not independently substantiated in the supplied product details.
Best for: DIYers lining smaller or segmented attic areas who prefer a narrow roll that can be cut and stapled to rafters.
Not ideal for: Buyers covering a large open attic in one project, or those who want a dedicated vapor retarder instead of a radiant barrier.
- Model:RG-X
- Coverage:542 square feet
- Roll dimensions:26 inches x 250 feet
- Material:Reinforced aluminum
- Radiant heat blocked:Up to 95% claimed
- Installation:Staple to attic rafters
Our verdict“Choose RadiantGUARD Xtreme for smaller, segmented attic jobs where a narrow reinforced foil roll is easier to handle than a wide sheet.”
CertainTeed MemBrain Smart Vapor Retarder, 8 ft x 100 ft
This 8 ft x 100 ft MemBrain is the more practical format for buyers who need humidity-responsive vapor control across standard interior assemblies, rather than the 120-inch-wide version’s 10-foot-wall fit. Like that wider CertainTeed MemBrain, it adjusts permeance as humidity changes: the intent is to restrict winter moisture movement while allowing moisture to dry toward the interior in summer. That makes it fundamentally different from Houseables Radiant Barrier, which is a reflective foil product rather than a smart vapor retarder. Its clear plastic roll installs like standard poly, but the product is specified for climate zones and assemblies where a vapor retarder is required. It is not an all-purpose attic solution, and the supplied details do not establish that it reflects radiant heat.
Pros:- Adapts permeance to changing humidity.
- Designed to limit winter moisture entry and let accumulated moisture escape in summer.
- 8-foot width offers a different fit from the 120-inch MemBrain roll.
- Installs like standard polyethylene sheeting.
Cons:- Use is intended for climate zones and assemblies where a vapor retarder is required.
- It is a moisture-control membrane, not a listed radiant-heat-reflecting barrier.
- The supplied product details give no coverage figure beyond the roll dimensions.
Best for: Renovators or builders who need a standard-width smart vapor retarder for interior assemblies with unfaced insulation.
Not ideal for: People seeking reflective attic foil, or buyers in a climate or building assembly where a vapor retarder is not called for.
- Model:902008
- Dimensions:8 feet x 100 feet
- Weight:9.8 pounds
- Material:Plastic
- Color:Clear
- Usage:Interior
- Package quantity:1 roll
Our verdict“Choose this MemBrain roll for specified interior vapor control when an 8-foot width suits the assembly better than the wider version.”
Houseables Radiant Barrier Insulation Roll, 250 ft × 4 ft, 1,000 sq ft
Houseables Radiant Barrier is a straightforward pick when broad coverage and a familiar 4-foot roll matter more than specialized moisture response. Its 1,000-square-foot coverage matches AtticFoil’s listed area, and its double-sided, perforated aluminum construction is designed to reflect radiant heat while allowing breathability. The roll is described as lightweight, tear-resistant, and easy to cut, which can simplify handling across a large project. Compared with the narrower RadiantGUARD Xtreme, it is better suited to covering broad sections with fewer runs; unlike either MemBrain product, it is not a smart vapor retarder. The foil is thin enough to warrant careful handling, and the stated cooling benefit depends on climate and installation. Buyers should not equate a reflective barrier with a complete insulation or vapor-control system.
Pros:- 1,000-square-foot roll suits broad projects.
- Double-sided perforated aluminum is designed to reflect radiant heat and allow breathability.
- Lightweight material is described as easy to cut and install.
- Product data describes tear resistance and compliance with multiple ASTM fire, smoke, and breathability standards.
Cons:- Thin foil needs careful handling during installation.
- Cooling-cost reduction depends on climate and installation quality.
- It does not provide the humidity-responsive vapor control offered by either MemBrain product.
Best for: Homeowners covering a large attic or building who want a lightweight, perforated reflective roll with 1,000 square feet of coverage.
Not ideal for: Buyers needing a humidity-responsive vapor retarder, or installers who prefer a thicker, more rigid material that is less delicate to handle.
- Length:250 feet
- Width:4 feet
- Coverage:1,000 square feet
- Construction:Double-sided, perforated aluminum
- Reflective value:Greater than 97% claimed
- Model number:RaBa
- Number of packs:1
Our verdict“Choose Houseables for wide-area reflective coverage, but select MemBrain instead when the job calls for a smart vapor retarder.”
US Energy Products 1000 sq ft Reflective Insulation Roll, 4 ft x 250 ft
For an attic project that calls for a long, continuous reflective layer, this 1,000-square-foot, 4-foot-wide roll covers substantial area with fewer roll changes. Its five-layer, non-perforated construction combines aluminum foil, Mylar, and reinforced scrim; the scrim is intended to resist tearing during handling, while the solid film may suit buyers seeking a radiant barrier that also limits vapor passage. The stated radiant-heat reflection is up to 97%, though that figure alone does not predict cooling savings, which depend on climate and the rest of the assembly. Compared with the narrower RadiantGUARD Xtreme, this roll is wider and covers more area, but its non-perforated design is less suited to applications that call for a vapor-open material. It is a reflective barrier, not a substitute for checking attic ventilation and local assembly requirements.
Pros:- 1,000 sq ft coverage can reduce roll changes on large projects
- Four-foot width suits broad attic runs
- Reinforced scrim is designed to improve tear resistance
- Reflective construction is rated to reflect up to 97% of radiant heat
Cons:- Non-perforated film may be unsuitable where the assembly requires vapor permeability
- Radiant-reflection claims do not establish actual energy savings for a specific attic
- A 250-foot roll may be awkward to handle in tight attic spaces
Best for: Homeowners covering broad attic areas who want a reinforced, reflective roll and have confirmed that a non-perforated barrier fits their roof assembly.
Not ideal for: Buyers who need a vapor-permeable layer, or anyone expecting the reflective surface alone to provide predictable cooling savings.
- Coverage:1,000 sq ft
- Dimensions:4 ft x 250 ft
- Thickness:8 mils
- Material:Aluminum foil, Mylar, and woven polyethylene scrim
- Construction:Five-layer, non-perforated
- Radiant heat reflection:Up to 97%
- Recommended uses:Attics, sheds, warehouses, and house wrapping
- Manufacturer:US Energy Products
Our verdict“Choose this for broad attic coverage when you want a reinforced reflective roll and a non-perforated layer is appropriate for your assembly.”
ROBERTS 70-118 Moisture Barricade Polyethylene Film Roll, 6 mil, 1,000 sq. ft.
This 6-mil polyethylene film is a flooring moisture barrier, not a purpose-built attic vapor retarder. Its Class 1 moisture-barrier rating and adhesive seam strip make it a practical fit over concrete subfloors beneath vinyl, laminate, SPC, or engineered wood. That defined flooring use is also the key limitation for this roundup: attic buyers should not assume that a product designed for underlayment is appropriate for a roof or ceiling assembly without checking installation guidance and moisture-control needs. Compared with the US Energy Products reflective roll, this film offers no stated radiant-heat reflection, but its seam strip addresses joining sheets for floor coverage. The 1,000-square-foot roll can cover a large floor, while its 12-foot width and 27.1-pound weight can make positioning cumbersome.
Pros:- Class 1 moisture barrier for listed flooring applications
- Adhesive strip helps join and seal seams
- 1,000 sq ft roll supports large floor installations
- 6-mil polyethylene film provides a defined under-flooring moisture-control layer
Cons:- Designed primarily for flooring, not attic assemblies
- No stated radiant-heat-reflection performance
- At 27.1 pounds and 12 feet wide, the roll can be awkward to position
Best for: Flooring installers and homeowners protecting vinyl, laminate, SPC, or engineered wood over concrete who may also be comparing moisture-barrier materials.
Not ideal for: Attic renovators seeking a reflective radiant barrier or a product specified for attic vapor control; its stated application is flooring underlayment.
- Material:Polyethylene
- Thickness:6 mil
- Coverage:1,000 sq ft
- Dimensions:12 ft x 83.5 ft
- Moisture-barrier class:Class 1
- Color:Black
- Weight:27.1 pounds
- Package quantity:1
- Warranty:Limited Lifetime
Our verdict“Pick this for moisture protection beneath compatible flooring over concrete, not as a default attic vapor barrier.”
How We Picked
I ranked these products by how clearly their material and format suit an attic barrier job, not by treating every reflective surface as an interchangeable vapor-control product. The main criteria were intended function, material type, coverage and roll dimensions, plus how readily a buyer can match the product to an attic layout. I also considered whether a product’s format makes sense for a small or broad installation and whether its role is clear enough to reduce the chance of buying the wrong category.
MemBrain ranks first for moisture-focused use because a smart vapor retarder is more directly aligned with moisture management than the radiant-barrier rolls. AtticFoil leads among the reflective options for its clearly stated large coverage format; the other reflective products follow according to their stated roll dimensions and coverage. ROBERTS earns a distinct place as polyethylene film rather than foil. Product dimensions and material descriptions alone cannot establish suitability for every climate or roof assembly, so I treat compatibility with local building guidance as part of the buyer’s decision, not a claim of universal performance.
| attic vapor barrier | Material |
|---|---|
| AtticFoil Original Attic Radia | Double-sided pure aluminum foil with internal tear-resistant fabric |
| CertainTeed MemBrain Smart Vap | Clear |
| RadiantGUARD Xtreme Radiant Ba | Reinforced aluminum |
| CertainTeed MemBrain Smart Vap | Plastic |
| Houseables Radiant Barrier Ins | — |
| US Energy Products 1000 sq ft | Aluminum foil, Mylar, and woven polyethylene scrim |
| ROBERTS 70-118 Moisture Barric | Polyethylene |
Factors to Consider When Choosing Best Attic Vapor Barriers
Before choosing a roll, decide what problem the attic needs to solve. Vapor control, air leakage, insulation, and radiant heat are separate concerns, and one sheet material rarely addresses all of them. These broader checks can prevent a common mistake: buying a reflective product for a moisture-control job, or adding a vapor retarder where the assembly needs to dry.
1. Identify the job: vapor control or radiant-heat reflection
Start by defining whether you are trying to limit water vapor moving through an assembly or reduce radiant heat transfer. A smart vapor retarder, polyethylene film, and reflective foil have different properties and should not be treated as equivalents. Reflective barriers generally depend on an adjacent air space to reflect radiant heat; pressing a reflective surface tightly against another material can change its value for that purpose. A vapor-control layer, meanwhile, needs to suit the climate and the full roof or ceiling assembly. If the main issue is air leakage, sealing gaps may matter more than adding a sheet layer. Match the product to the diagnosed problem before comparing roll size.
2. Check the whole roof assembly and local guidance
A vapor-control layer can affect where moisture accumulates and how an assembly dries, so the right placement depends on climate, insulation, ventilation, and existing layers. Adding an impermeable sheet without understanding those conditions can trap moisture rather than solve it. Look at the existing ceiling, roof deck, insulation, and ventilation path, and check applicable local building guidance before covering surfaces. A product label alone does not establish that a particular placement is suitable for your home. When the assembly is unfamiliar or moisture damage is present, get advice from a qualified building professional. This step can matter more than choosing between two similar roll widths.
3. Plan coverage around width, seams, and obstacles
Square-foot coverage is only part of the material estimate: attic geometry, overlap, cuts, and access constraints determine how much usable area a roll provides. A very wide roll may cover a large section quickly, but it can be awkward to maneuver through a hatch or around framing. Narrower rolls can be easier to handle and fit between obstructions, though they may create more seams. Before ordering, measure the actual installation area and sketch how the material will cross rafters or other supports. Include allowance for overlaps and trimming rather than assuming every listed square foot becomes installed coverage. Choose the format that reduces difficult cuts, not simply the one with the largest coverage figure.
4. Match material flexibility to the installation
Flexible rolls can suit irregular attic spaces, but installation still depends on the substrate and the product’s specified fastening and seam details. A sheet that is easy to roll out may be hard to keep aligned overhead, especially when working alone. Plan how you will secure edges, treat seams, and keep the layer continuous around penetrations without blocking ventilation paths. Do not assume tape, staples, or a particular facing method is compatible unless the manufacturer’s instructions say so. For a first project, a manageable roll width and a clearly defined installation plan may be more useful than maximizing coverage per roll. Complex roof details can call for professional installation.
5. Decide when a specialized product is worth choosing
A smart vapor retarder can make more sense than basic film when the design calls for a moisture-responsive layer, while polyethylene may suit a specification that explicitly calls for that material and thickness. Reflective rolls are a separate choice when radiant-heat control is the goal and the assembly can provide the required air space. Paying for a specialized material is only useful if its properties match the installation; a more advanced product cannot compensate for incorrect placement. Conversely, selecting a simple film just because it is familiar can be a poor fit if the assembly needs a different drying behavior. Compare the required function and installation details before choosing based on material name alone.
6. Treat ventilation and insulation as separate parts of the plan
A vapor barrier does not replace insulation, air sealing, or attic ventilation. Blocking soffit or other designed airflow while installing a sheet can interfere with the roof’s ventilation strategy. Likewise, a radiant barrier should not be assumed to deliver the same benefits as adding insulation or sealing ceiling penetrations. Review the attic as a system and note where air moves, where insulation is thin, and where moisture might enter. Plan the barrier so it does not cover vents or create unintended pockets. If multiple problems are present, address them in a coordinated order rather than expecting one roll product to fix them all.
Frequently Asked Questions
Can I use a radiant barrier roll as an attic vapor barrier?
Not automatically. A radiant barrier is designed to reflect radiant heat, while a vapor barrier or retarder controls water vapor movement; a reflective facing does not by itself confirm that the product is suitable for vapor control. Check the product’s stated permeance, installation instructions, and intended use before relying on it for moisture management. Also confirm whether the reflective surface needs an adjacent air space to function as intended. If the project specifically requires a vapor-control layer, choose a product documented for that role and follow local guidance.
Should I install a vapor barrier on the attic floor or along the roof?
The right location depends on the home’s climate, insulation arrangement, ventilation design, and existing layers. A layer at the ceiling plane and one along the roof deck affect different parts of the assembly, so copying a detail from another house can cause problems. First identify where the insulation and air-control layers sit, then check local building guidance for the assembly type. Avoid adding a low-permeance layer until you know how the roof can dry. For an attic with condensation, mold, or wet insulation, investigate the moisture source before covering anything.
Does a reflective attic barrier need an air gap?
Many reflective barriers rely on an air space next to the reflective surface to reduce radiant heat transfer. If the foil is installed flush against another material, its radiant-barrier function may differ from an installation that follows the product’s specified spacing. The needed arrangement depends on the product and the assembly, so read its instructions rather than assuming a universal gap size. Keep any existing ventilation paths open as well. A reflective layer is not a substitute for insulation or air sealing.
How do I choose between MemBrain and polyethylene film?
Choose based on the assembly’s moisture-control requirements, not on the fact that both products come as rolls. MemBrain is a smart vapor retarder intended to respond to changing humidity conditions, while the ROBERTS product is 6-mil polyethylene film with a different vapor-control profile. That distinction can affect how an assembly handles drying, so the correct choice depends on climate, layer placement, and the materials already in the roof or ceiling. Follow the product instructions and local requirements, and seek professional advice if the assembly is uncertain. Neither product is a universal fit for every attic.
How much attic barrier material should I buy?
Measure the area that will actually receive the material, then account for overlaps, cuts, framing, and obstacles. The listed square-foot amount is a starting point, not a guarantee of installed coverage, and wide rolls may create more offcuts in a small or irregular attic. Sketch the layout and check whether the roll can pass through the access opening and be handled safely overhead. Follow the manufacturer’s seam and overlap instructions when estimating. If the installation includes many corners or penetrations, allow extra material rather than planning to use every inch.
Conclusion
For best overall moisture-focused use, I’d choose CertainTeed MemBrain, after confirming it suits the roof assembly. Best value by broad coverage format goes to AtticFoil Original among the reflective options, while RadiantGUARD or US Energy Products may fit buyers whose layout favors their specific roll dimensions. Best premium-style specialized choice is MemBrain for projects that call for a smart vapor retarder, and best for beginners is the format that is easiest to move through the attic and plan around—not necessarily the widest roll. For a project that explicitly calls for polyethylene film, ROBERTS is the specific-use pick. Choose the barrier by function first, then confirm placement, air space, and assembly compatibility before buying.
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