Can you put Tyvek on a roof?

Can Tyvek® be used on roofs? Under floors? No, these uses are not recommended. All Tyvek® products in Canada and the U.S. have been tested and approved as products to be installed behind exterior walls.
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Do house wraps work on roofs?

Housewrap, a common type of weather-resistive barrier (WRB), is installed between the cladding layer and the sheathing, while roofing underlayments go directly under shingles or other roofing material, forming a second line of defense against the elements.
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Will Tyvek keep rain out?

Is Tyvek Homewrap breathable for home weatherization? Yes, Tyvek is made with unique material science to keep air and bulk water out while allowing moisture vapor inside walls to escape.
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Will water pass through Tyvek?

Tyvek® is unique

DuPont Tyvek® weather barriers have a unique structure, with millions of extremely fine pores that resist bulk water and air penetration, but allow water vapor to pass through and escape the building.
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What should I put under shingles?

Answer: Roofing felt is a layer of tar paper installed beneath the shingles to provide a backup waterproof membrane in case of leakage. Felt, otherwise known as underpayment, is required when asphalt shingles are installed as a first layer of roofing or when they are applied over wood shingles or a built-up roof.
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DuPont™ Tyvek® roof installation video - CZ



What can I use instead of roofing felt?

EPDM membranes are fast-becoming the roofing industry's go-to alternative to felt and other outdated roofing materials. The composition of EPDM as a synthetic rubber compound offers superior waterproofing qualities and resistance to the elements.
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What roofing underlayment is best?

Synthetic Underlayment

This is currently the most popular choice for roof underlayment, and with good reason. Made with an asphalt-saturated basemat and fortified with a mix of fiberglass, this product is not only extremely water-resistant, much stronger and more resistant to tears than other types of underlayment.
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Is block it better than Tyvek?

BLOCK-IT* House Wrap features a patented water channeling technology that delivers over 98% water drainage efficiency. Not only does it provide 20% greater water holdout than Tyvek® HomeWrap® product‡, it's also 40% stronger‡. Protect your house and your reputation with BLOCK-IT*.
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Can I use 2 layers of Tyvek?

There is no problem with doing this. Housewrap is "breathable" by design so you won't trap moisture anywhere. You could build a wall with ten layers of housewrap and it would be more durable, not less.
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How waterproof is Tyvek?

Tyvek is waterproof in the sense that its structure remains stable and unaffected even when submersed in water, it's just as strong when it's wet as when it's dry.
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Can Tyvek be installed over wet plywood?

Can one safely install housewrap over a one-time 'wet' structural plywood or OSB sheathing exterior? The answer: YES! ABSOLUTELY!
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How does water get behind house wrap?

Another possible source of the water behind the house wrap is interior humidity that has a direct path to the exterior. You indicated you moved into the home, yet it's not finished. You live in a cold climate and the interior relative humidity is almost always higher in the inside of your home than it its outside.
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What is the difference between Tyvek and house wrap?

Typar® Building Wraps has a lower perm rating compared to Tyvek® HomeWrap®; so, a wall covered with Typar® can take longer to dry, which increases the risk of mold, mildew, and rot. Tyvek® HomeWrap® has a drainage plane so can manage bulk water better than Typar® Building Wrap, that does not have a drainage plane.
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Is house wrap better than tar paper?

The main advantage of house wrap, over felt paper, is the superior strength and durability of house wrap. A high-quality house wrap, like Barricade® Building Wrap, is more resistant to ripping and tearing during installation than felt paper.
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What's better tar paper or Tyvek?

Tyvek offers more permeability but less longevity, and you find it near the exterior siding. Tar paper withstands high moisture levels, but it can crack in freezing temperatures. That's why you usually find it on the interior walls.
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Can you put Tyvek on backwards?

Can you install Tyvek® WB with the lettering facing inwards or upside down? Tyvek® HomeWrap® and Tyvek® CommercialWrap® are non-directional and are equally effective if installed with the logo facing the inside or outside of the wall or with the logo oriented in any direction.
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Can you overlap house wrap?

Overlap 6 Inches or More

Overlap all house wrap seams at least 6 inches. Make sure to think like you're shingling: work from the bottom up so that higher rows overlap lower ones.
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Is Zip better than Tyvek?

d.

The Tyvek Wrap products are vapor permeable at 54 perms, allowing the building walls to dry quicker than ZIP Sheathing, which is permeable at 16 perms.
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What can I use instead of Tyvek?

Alternatives to Tyvek
  • R-Wrap.
  • Tar Paper.
  • StrongSeal.
  • Zip System.
  • Foil Insulation.
  • Insulated Concrete Form.
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Can I use plastic instead of Tyvek?

You can use plastic if you put polyethylene between your drywall and the wall studs. This way, you should get a tighter wall without trapping moisture inside the exterior walls. If you are framing out a below-grade basement, however, do not use plastic as a vapor barrier.
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What goes on roof before shingles?

Underlayment— This is the first layer of waterproofing that goes down in between sheathing and shingles. Underlayment seals the roof from damaging elements like snow, ice and rain. Also referred to as a membrane, underlayment is mandatory for providing the roof with a waterproof barrier.
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What is the most common roof underlayment?

One of the most common types of underlayment used in residential, steep-slope applications is black, ashphalt-saturated felt paper. Felt underlayment may be made from either organic or fiberglass substrate, although the organic is much more common. It's called "organic" underlayment because it has a cellulose base.
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Can you use synthetic roof underlayment for house wrap?

A. Paul Fisette, director of Building Materials and Wood Technology at the University of Massachusetts Amherst and a JLC contributing editor, responds: Unless you are located in a cooling-dominated climate, I would steer clear of installing a synthetic roofing underlayment in the manner you describe.
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