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Also, it's important to understand where house wrap is installed in the multi-layered construction of a home. House wrap is intended to be installed over the sheathing and behind the siding, regardless of the siding you are using. When water gets behind exterior cladding—as it inevitably will—it should always encounter a weather-resistive barrier to protect the structure from moisture damage. For many new homes, housewrap serves as this last line of defense. It’s crucial, then, to fully understand the performance differences between housewraps and to use the right one for the job ...
Comparing House Wrap Durability
And no, a house wrap is not a sort of mural or wallpaper for outdoor use that makes your house look nice. A house wrap is a material that won’t be seen but instead offers a more practical use. It’s not only seams that need taping—everything that penetrates a wall needs it too! Using capped fasteners will ensure a good night’s sleep on those windy nights knowing the house wrap you installed last week is not blowing all over the neighborhood. The installation process typically takes longer, beginning with a base coat that starts at the bottom and goes up. After the base coat, the seams and corners of the building are reinforced with polyester joint fabric, then a second coat is applied.
Superior performance based on unique material science
These side effects are not exactly what you look for in a healthy home. The UV stability or UV resistance of a house wrap product may not initially seem very important because the house wrap will be covered by exterior siding. However, if you are installing house wrap on a new building, the wrap typically remains exposed to direct sunlight during construction, which can last for several weeks.
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Barricade® Seam Tape
In this in-depth product guide, we will look at what house wrap is, why it's essential, and then look at some of the most important considerations when choosing the best type of house wrap for your home. Recent developments have led to the creation of integrated WRB sheathing, which is essentially a structural panel that is designed with an integrated water-resistive barrier. This type of house wrap eliminates the risk of water getting trapped between the panel surface and the back of the house wrap material.
Who's Earning What in Construction
And a common practice to avoid is installing strapping horizontally. That prevents both the drainage and air convection that is essential for walls to stay dry. Water drains down and warm air rises - don't stop that from happening.
Replacing polyethylene vapour barriers with latex paint vapor control
Tyvek is a brand name often used to refer to water-resistant barriers (WRB), also known as house wrap. The International Building Code (IBC) requires a water-resistant barrier to be installed behind the exterior cladding. Water-resistant plastic barrier materials are not exclusive to Tyvek, and similar products are manufactured under dozens of trade names. Other WRBs include asphalt felt and Grade D building paper, rigid foam board insulation, liquid-applied sealers; Zip System sheathing; and Delta-Dry product. Keep in mind that rigid foam insulation can be a vapor barrier – XPS as of about 1 inch, EPS as of about 2 inches. Despite the fact that we regularly see it being installed on the exterior of houses, that isn’t a great thing since it acts as a vapour barrier.
This feature can help regulate your home's humidity levels and ensure that your wall sheathing does not suffer from excess moisture that could lead to rot or mold. As long as the contractor ensures that the house wrap is carefully connected and sealed at the seams and overlaps, the house wrap can also act as an air barrier. House wrap, then, is a crucial element in ensuring a sealed building envelope.
Prime Wood Siding Before Installing House Wrap
If the house wrap is not resistant to UV radiation, it can begin to break down during this period, so it's recommended to invest in a house wrap with built-in UV protection. The primary purpose of house wrap is to prevent water from reaching the wall cavity of the home, so it's necessary to find a product with a high level of water resistance. As for a way to explain it, a vapour barrier is in effect ‘water proofing’ walls, or at least making it water resistant. Oil paint on plaster walls or drywall will prevent moisture from absorbing into the wall cavities just as a poly vapour barrier would, but it won’t stop air leakage. Sounds like the exterior cladding was built wrong all around, sorry to say. If there was tar paper against sheathing and then shingles directly on the tar paper, it will not be able to dry.
Today, most house wrap manufacturers require their product to be installed with cap nails or cap staples. This change definitely slows down the process, but on the upside, capped fasteners hold house wrap to the wall up to 25 times better than staples. Instead, choose a quality house wrap like Tyvek, with a perm rating of 54.
Another common type of house wrap is called grade D building paper. This product is essentially a kraft paper with asphalt integrated into the design to increase the water resistance of the material. It's often used under stucco exteriors and has a similar vapor permeability as asphalt felt house wrap. One drawback to using grade D building paper is that it can deteriorate if it remains wet for a prolonged period of time.
Next, cut the house wrap flush at the top and bottom of the opening, creating two flaps. Wrap the flaps inside the building, past the jack stud, before cutting off the excess. At the top, slice several inches up and away at an angle, and hold the flap up with a piece of tape (it will be folded back down and taped after the window is installed). Water tends to condense on house wrap, much more so than it would if there was just wood sheathing behind the siding.
While installing the water-resistive barrier, you might experience minor tears. You can easily cover tears using flashing systems products or Tyvek Tape of either 2″ or 3″. Several penetrations include bathroom exhaust fans, exterior lights, dryer vents, gas lines, electrical outlets, and bathroom exhaust fans. Therefore, it would be best if you sealed the Tyvek around all HVAC, plumbing, and electrical penetrations with Tyvek tape, flashing systems products, and weatherization sealant. Here, the upper layer of your water-resistive barrier must overlap the lower layer of the WRB by at least 6″.
The IBC specifies a few cases where a weather-resistant exterior wall envelope is not required. After installing a water-resistive barrier, refer to the flashing system guidelines to flash and prepare doors and windows. Tyvek WRB must be split from the brick veneer by a 1″ airspace Consistent with the recommendations and requirements. In addition, Through-wall and door and window flashing must be integrated with the Tyvek layer guaranteeing proper shingling.
A rigid foam board will offer enhanced structural support to the Tyvek layer when installing it over the Tyvek WRB as an intervening layer. However, if you install a rigid foam board within 24 hours of the Tyvek layer, it may reduce the number of fasteners you require for the attachment of the Tyvek WRB. The Weather Watch membrane I saw was an ice and water shield roof membrane, is that what you are talking about?
Unless you are building your own home from scratch, house wrap installation will most likely be your contractor's responsibility. If you want to offer some oversight while the contractor is installing the house wrap, make sure that the wrap is installed to the very top of the walls with no visible spaces or gaps. Also, make sure that your contractor is using high-quality building tape to seal all edges and overlaps. You can watch a more detailed explanation for installing house wrap in this YouTube video. Because house wrap is covered by exterior cladding, it should last for as long as the house is standing. The main "durability factors" related to house wrap occur before cladding installation.
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