Tyvek is a moisture barrier. It is meant to keep liquid water out of the wall but it will let water vapor pass through it. (Note that they call it “vapor permeable.") So, it goes on the cold side..
Consequently, does it matter which side of Tyvek faces out?
If you install it on the inside BACKWARDS (the Tyvek name facing the wall) moisture will still be able to penetrate the outside wall but will not go thru the Tyvekin that case it would act like traditional plastic sheeting.
Subsequently, question is, can Tyvek be installed upside down? Can you install Tyvek® WB with the lettering facing inwards or upside down? Tyvek® HomeWrap®, Tyvek® StuccoWrap®, Tyvek® DrainWrap™ and Tyvek® CommercialWrap® are equally effective in both directions and the logo may be on the inside or outside.
Likewise, which way does Tyvek go?
However, DuPont Tyvek StuccoWrap and Tyvek DrainWrap has a specially engineered surface that should be placed with the grooves in a vertical direction.
Is house wrap directional?
calling Tyvek just to be sure and they said the house wrap is "non-directional," so it can be installed anyway you want".
Related Question Answers
Is it OK to staple Tyvek?
Tyvek says you can use 4 staples per 9 feet of house wrap if you tape over them an apply the siding right away. But a cap stapler is better.Is Tyvek waterproof?
A: Yes, like woven materials, Tyvek® can be laminated with a variety of materials, the breathability and water resistant properties may be changed depending on the materials selected for lamination.Is Tyvek a moisture barrier?
DuPont™ Tyvek® DrainWrap™ is a moisture barrier designed to provide enhanced drainage in areas subject to extreme, wind driven rain. It combines the superior air and water resistance, vapor permeability and strength of Tyvek® with a vertically grooved surface, to help channel water safely to the outside.Is Tyvek toxic?
Tyvek (R) may be categorized as essentially non-toxic. The nature of the product make either ingestion or inhalation highly improbable.How much is a roll of Tyvek?
The maximum reported cost of Tyvek house wrap is $0.97 per square foot. The minimum reported cost of Tyvek house wrap is $0.41 per square foot.Can you put 2 layers of house wrap on?
The building code requires two layers, or equivalent, over wood-based sheathings when the cladding is a cementitious product; however, many consultants still advise that two layers are the best practice, even when not applied over wood-based sheathings.What is the R value of Tyvek house wrap?
How can you prevent air and moisture from getting inside your home? Use Tyvek® HomeWrap® weatherization system underneath your siding, stucco or brick. The average wall has 3-1/2 inches of insulation which, under ideal conditions, has an installed R- value of R-14.Can Tyvek be painted?
Tyvek is made of a polyethylene plastic that is designed to be resistant to moisture and chemicals. Any type of paint is just going to coat the surface and really won't penetrate and die the fibers. You can paint it, it just won't last forever.What goes on first insulation board or house wrap?
You plan to install 2 or 4 inches of rigid foam on the exterior of the wall sheathing, followed by vertical rainscreen strapping and siding. For example, I've heard that the housewrap belongs between the foam and the strapping, “because that way it's easier to integrate with the flashing at the logical drainage plane.”Is Tyvek tape breathable?
DuPont™ Tyvek® Seam TapeIt helps to create a continuous building envelope system which keeps water and air out. Benefits can include not only better building durability but improved energy efficiency through reduced air leakage. Tyvek® Tape is strong, easy to use, and highly waterproof.Is Tyvek reversible?
Made of highly-recyclable Tyvek, a water-resistant, lightweight substrate, our Tyvek Reversible Reusable Tote/Travel bags act a lot like fabric with a surprisingly light-weight feel.Can you use two layers of Tyvek?
When it gets to tar paper, Tyvek, etc… these items are not impermeable (aka *Vapor Retarders) as they allow vapor to flow through them. (*We will discuss this more in another piece on “perms”) So having two layers of Tyvek or where you place Tyvek over tar paper is allowable / should not cause issues.How do I install Tyvek on an existing window?
On both sides of the window or door, trim the wrap close to the window or door flange. Secure the wrap to the flange with tape or caulk. Install side flashing over the wrap. Install head flashing and extend out 3-4 inch to each side.What is Tyvek used for?
Tyvek (/ta?ˈv?k/) is a brand of flashspun high-density polyethylene fibers, a synthetic material; the name is a registered trademark of the DuPont company, known for their production of chemicals and textiles. Tyvek is often used as housewrap, a synthetic material used to protect buildings during construction.Do house wraps go before Windows?
The most important part of weatherproofing begins before the window goes in. After the house wrap is cut, tuck the bottom flap into the house and install sill flashing. Then fold in the sides of the house wrap, but leave the top flap alone.Do you have to replace house wrap when replacing siding?
There is no problem with applying a new layer of housewrap over the old. In fact, it's recommended. Aside from the likelihood that there have been advances in the housewrap membrane itself over the last 23 years, you can't be sure how long the existing housewrap was left exposed to the sun before siding was installed.Can you side a house in the rain?
Resume SidingAfter a rain, you can start siding again as soon as the previously installed siding and the house wrap are dry. If the uninstalled siding strips were left outside, the boxes will now be soggy and the strips will be wet. The water won't hurt them, but it can make them slick and hard to handle.Should I use house wrap?
Using house wrap is very important to provide a barrier for moisture and other concerns. Some codes require house wrap or another type of coating, while others do not. You have options, but house wrap is often the most logical of the options since it provides a radiant barrier. 
John Parsons 
