Chloe Zhang
Hardie Backer Board is a popular choice for exterior wall surfaces and tiling projects. It is known for its durability and water-resistant properties, but there is some confusion regarding whether it is completely waterproof. While Hardie Backer Board is not harmed by water, it is not entirely waterproof as it can absorb water that seeps through tile and adhesive layers, eventually releasing it back into the atmosphere. To address this, some people choose to install a plastic barrier, such as a PVC membrane sheet, behind the board to protect the sub-frame in areas that are continuously wet for extended periods. This practice is especially relevant in moisture-prone areas like bathrooms. However, others argue that tile has been set for thousands of years without plastic behind it, and the decision to use a water barrier depends on personal preference and the specific requirements of the project.
| Characteristics | Values |
|---|---|
| Waterproof | Water-resistant but not waterproof |
| Mold-resistant | Yes |
| Vapor barrier required | Yes |
| Plastic required | Yes |
| Waterproofing required | Yes |
| Use case | Renovation or new construction |
| Installation location | Behind tiles in areas where moisture is a concern |
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What You'll Learn
HardieBacker is water-resistant, not waterproof
While HardieBacker is a water-resistant product, it is not entirely waterproof. This means that while water will not damage the HardieBacker, it can absorb water and soak through. Therefore, it is recommended to install a vapor barrier behind the HardieBacker to prevent mould and moisture buildup.
The confusion around whether HardieBacker is waterproof or not may stem from marketing and misinformation by manufacturers. Some sources claim that tile setters and contractors often assume that HardieBacker is waterproof, which is not accurate. While it is true that HardieBacker can withstand exposure to water without degrading, it is important to distinguish between water resistance and waterproofing.
To ensure proper waterproofing in wet areas, such as shower benches or bathtub surrounds, it is generally recommended to install a topical waterproofing system or a sheet of 4 mil polyethylene plastic behind the cement backer board or HardieBacker. This creates an additional barrier that prevents water from seeping through and causing potential damage.
However, it is important to note that waterproofing practices have evolved over time. In the past, tile installations did not always include plastic barriers, and showers constructed without modern waterproofing techniques can still last for many years. Nonetheless, the general consensus among professionals is that waterproofing is a worthwhile precaution to prevent potential issues and ensure the longevity of the installation.
While HardieBacker itself may not require waterproofing, it is always advisable to consult manufacturer instructions, industry guidelines, and local building codes to determine the appropriate waterproofing measures for specific applications. Additionally, seeking certified installers with experience in waterproofing is essential to ensure the best results and prevent future problems.
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Vapor barriers prevent mould
While Hardiebacker is not water-permeable, it is also not waterproof. Water will absorb into it and eventually soak through. Therefore, it is recommended to install a vapour barrier behind the Hardiebacker to prevent mould and moisture buildup.
Vapour barriers are designed to control the movement of moisture. They are particularly important in preventing moisture buildup in walls, which can lead to mould growth. Mould requires moisture to grow and can become dormant when it dries out. Thus, a well-installed vapour barrier that controls the flow of moisture will prevent mould growth.
However, it is important to note that the vapour barrier must be installed correctly. If installed on the interior of an assembly, vapour barriers can prevent inward drying and lead to moisture problems and mould issues. The placement of the vapour barrier depends on the climate. In cold climates, the barrier is placed on the warm (interior) side of the insulation, while in hot and humid climates, it is placed on the cool (exterior) side.
Additionally, the type of vapour barrier chosen should be suitable for the specific application. Vapour barriers come in different forms, such as sheets, coatings, and membranes, and are categorized based on their permeability—how much moisture they allow through. Class II barriers, for example, are semi-permeable and suitable for a range of climates, while Class III barriers are the most permeable and typically used in milder climates or as part of a moisture management plan.
In summary, vapour barriers are essential in preventing mould growth by controlling moisture levels. However, proper installation and selection of the appropriate vapour barrier are crucial to ensure their effectiveness and avoid potential moisture problems.
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HardieBacker is a popular choice for areas with moisture
While HardieBacker is a well-known option for backer boards, it is not waterproof. Water will absorb into it and eventually soak through. Therefore, it is recommended to install a vapour barrier or a waterproof membrane behind the HardieBacker to prevent potential water damage and mould growth. Some people choose to staple plastic sheets to the wall before installing the HardieBacker.
However, with the introduction of new products like the Hardie Backer Board with HydroDefense Technology, waterproofing the backer board may no longer be necessary. This new product is claimed to be 100% waterproof and features a mould block technology.
There are alternative backer board options available in the market that offer comparable or superior performance to HardieBacker in terms of moisture resistance. These include Allura backer board, which offers multiple thickness options, and cement board, which has excellent moisture resistance, durability, and flexibility for both interior and exterior applications.
In summary, HardieBacker is a popular choice for areas with moisture due to its high resistance to moisture and durability. However, it is important to consider the risk of water absorption and choose the most suitable product for your specific needs, whether it is HardieBacker or one of the alternative options available.
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Waterproofing is not required, but beneficial
While waterproofing is not mandatory, it is beneficial to waterproof Hardiebacker with a plastic barrier sheet. Hardiebacker is water-resistant but not entirely waterproof, meaning it is not harmed by water but will absorb it. This water will then be released back into the atmosphere when conditions change.
In areas that are continually wet for extended periods, an impervious plastic barrier sheet is required as a last line of defence to protect the sub-frame behind the board. For example, when Hardiebacker is installed behind showers, a PVC membrane sheet is recommended to prevent water ingress.
Some contractors may argue that waterproofing is unnecessary, and it is true that tile has been set for thousands of years without plastic behind it. However, waterproofing is a good precaution to prevent potential issues with mould and moisture.
The new hydro-safe ultimate Hardie board, for instance, does not require a moisture membrane on the walls, but it does benefit from having one. If you are concerned about moisture, it is advisable to spend the extra time and resources to waterproof your Hardiebacker.
Overall, while waterproofing may not be strictly required, it can provide added protection and peace of mind, especially in areas prone to moisture.
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Plastic was commonly placed behind cement boards
While it is not necessary to place a vapor barrier behind hardiebacker or cement boards, plastic was commonly placed behind cement boards in the past. This was done to prevent water damage and the growth of mould. However, it is now known that placing a vapor barrier behind a backer board can trap water and cause mould to grow on nearby walls.
The current best practice is to place waterproofing over the backer board and just under the tile. This allows any moisture that gets behind the cement board to evaporate. Thin sheet membranes, such as Kerdi or NobleFlex, can be used for this purpose. Paint-on membranes, such as RedGuard or AquaDefense, are also effective.
In some cases, a vapor barrier may still be required behind cement boards. For example, if a product like Durock is used, a barrier must be applied to protect the studs. This can be done using a product like Kerdi or RedGard, or a traditional barrier. However, it is important to note that only one of these products should be used and that they should never be layered.
Additionally, the use of solid impermeable membranes behind tiles is not always recommended. Gravity can help with water proofing, and the small area behind the tile should not create any mildew problems as long as moisture is allowed to pass through the walls. This can be achieved by using products like RedGard, which is applied over the backer board.
While the new Hydro Safe Ultimate Hardie board does not require a moisture membrane on the walls, it can still benefit from having one. In this case, it is recommended to tape the seams and thinset over them before smoothing them out. This provides extra protection against water damage.
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Frequently asked questions
While HardieBacker is water-resistant, it is not waterproof. Therefore, it is recommended to install a PVC membrane sheet to prevent water ingress in areas that are continually wet for extended periods.
The plastic acts as a vapor barrier, preventing moisture and mould buildup behind the board.
While some contractors may claim that waterproofing is not required, it is generally recommended to waterproof the board to prevent potential issues with mould and water damage.
One alternative is to use a product like DensShield, which is a mould-resistant wall and tile backer board. Another option is to seal the joints in the board and tanking for extra protection.
Hardie Backer Board is a popular choice for exterior wall surfaces as it provides a stable and secure base for tiles to adhere to, making it durable and reliable for areas where moisture is a concern.
