Frequently asked. And expertly answered.

At TYPAR®, we remain at the ready to share facts about our performance and information on our products. Here are responses to some of the most common questions fielded by our team. Need to know more? Contact us.


What types of cladding can TYPAR® building wraps and accessories be used behind?
All types. From stucco and brick to vinyl and cedar lap siding, TYPAR is the ideal weather-resistant barrier.
My lumber sales rep told me that James Hardie requires the use of asphalt felt. Is this true? Can I not use TYPAR with HardiePlank™?
TYPAR BuildingWrap, which is approved by ICC, is appropriate for installation beneath HardiePlank siding and similar products.
Is “regular” TYPAR BuildingWrap approved for commercial use? I was under the impression that it was, but now I see you have MetroWrap. What is that?
Of course you can use TYPAR BuildingWrap for light commercial applications, but TYPAR® MetroWrap is designed to stand up to the rigors of commercial construction. Unlike other building wraps, TYPAR MetroWrap withstands greater wind loads at six floors and above — where many commercial buildings are vulnerable. MetroWrap also provides up to 12 months of UV resistance — a huge benefit in terms of frequently changing construction schedules.
Our 50-year-old church needs a new exterior. The building has no interior vapor barrier. The exterior is currently cedar siding, but we plan on replacing it with vinyl siding. Question: What kind of wrap would be suitable?
Great question! TYPAR MetroWrap is the best choice for your project. It is a commercial-grade that offers the same performance benefits as TYPAR BuildingWrap with additional enhanced features, such as greater wind and UV resistance. It is suitable for all types of cladding and offers exceptional water holdout and moisture vapor transmission. Visit the individual product pages. There you’ll find complete, downloadable PDF information for the entire system of products.
Do you recommend TYPAR BuildingWrap for older house renovations?
Definitely. The TYPAR® Weather Protection System is an excellent way to protect the integrity of older buildings and preserve your renovation investment for years to come. Superior air and water holdout, exceptional moisture vapor transmission and ultraviolet stability are just a few of the benefits of TYPAR. In addition, you’ll realize greater energy efficiency.
Can TYPAR BuildingWrap be used as an interior vapor barrier?
No. TYPAR cannot be used as an interior vapor barrier as it is designed to allow moisture to pass through it in the form of gasses. In general, vapor barriers are only allowed to have very low or no breathing capability.
Is TYPAR fire-rated? If so, what are the flame spread and smoke indexes?
TYPAR BuildingWrap is fire-rated with a smoke spread index of 0 and a flame spread index of 30.

Energy savings

Will wrapping my home save energy? I am in a house that is not wrapped and my heating bills are too high.
If you are planning to re-side your home, you should definitely consider the TYPAR Weather Protection System. At the heart of the system is TYPAR BuildingWrap which acts as an air and moisture barrier, while simultaneously allowing moisture vapor to escape from the wall cavity to the outside. Installed before the exterior siding, TYPAR BuildingWrap protects your home from nature’s harshest elements and has exceptional tear strength and ultraviolet stability. It also provides energy-efficiency for years to come, which is important for energy- and budget-conscious consumers. According to DOE and ENERGY STAR®, continuous air barriers such as TYPAR BuildingWrap could reduce your energy cost as much as 15% to 20%.
What is the R-value of TYPAR?
TYPAR does not have an R-value in and of itself. It does, however, contribute to the total number of the R-value of the insulation used.
How do I know which building wrap product is right for my particular application?
All TYPAR building wrap products offer superior water holdout, tear strength, UV resistance and energy-efficiency. But if you are planning a commercial building, or if you build in a high-wind, hurricane-prone area, you may want to consider TYPAR MetroWrap.
Why is air porosity important in a building wrap?
Another term for building wraps is Air Infiltration Barrier (AIB). Preventing air leakage and weather damage are the two main functions of all building wraps. Preventing air leakage is the key to energy-efficiency. All building wraps must meet industry standards requiring a high degree of air infiltration resistance, and TYPAR exceeds these standards on both wall section and whole-house testing. In addition, tears and nail holes can greatly affect air infiltration; unlike some other building wraps, TYPAR is exceptionally resistant to tearing and puncturing, which provides extra assurance of an airtight structure.
How much moisture vapor should a building wrap pass in order to prevent condensation problems?
Experts agree that a building wrap should pass water vapor 5 to 10 times faster than the internal vapor barrier. Since most vapor barriers measure at 2 to 4 g/m2/24 hr., a minimum value of 10 to 40 g/m2/24 hr. is sufficient. This is the range for various types of 15 pound felts that have been in use for years. TYPAR BuildingWrap is 3 to 4 times greater than this minimum value range.
How much water should a building wrap resist once it’s placed on the wall?
The key here is being able to resist blowing rain, snow and sleet in the field, not just water in the laboratory environment. Tests have shown that TYPAR has excellent water holdout for a vertical surface. In fact, because TYPAR does not tear on the jobsite, it is actually more water-resistant than some other building wraps claiming big numbers in the lab. Those building wraps are more likely to rip, which makes the laboratory test figures meaningless.
How does TYPAR compare in tear resistance?
"In-plane" is the best measurement of tear resistance for a housewrap. The trapezoid tear test, the best measurement of in-plane tear resistance, takes place when the housewrap is fastened to the wall and is subjected to tearing in the plane of the wall. TYPAR is more than eight times higher in trapezoid tear resistance as Tyvek®. The builder can be certain that TYPAR will not blow off or tear and will continue to perform on the building. Remember: If the housewrap is torn or damaged before it is covered, it will leak and no longer be an air barrier; all of the laboratory data becomes invalid. Because of its strength, TYPAR performs in the field as well as in the lab.
How does TYPAR compare in tensile strength?
Some housewraps make claims about their strength based on tests performed on narrow strips of fabric. Since the product is never used in this way, these measurements are not meaningful. This is even stated in the test procedure used by some other housewraps; American Society for Testing and Materials test ASTM D882 is for thin plastic sheeting, not nonwoven fabrics. The grab tensile measurement, however, is meaningful. The test, ASTM D5034, clearly states it is designed for nonwoven fabric. In this test, a sample 4′ x 6′ is tested for tensile strength. The results of this test (performed by an independent laboratory) indicate that TYPAR’s superior strength translates to performance on the jobsite.
How does TYPAR compare in UV resistance?
Other housewraps are limited to UV protection only in the coating. Construction mishaps and wind can cause the coating to peel off or deteriorate, further minimizing UV stability. TYPAR is the only housewrap that has UV protection and antioxidants in both the fibers and the coating; the formula used to protect it was extensively tested for more than four years.
What is the best way to compare TYPAR and the competition?
It is important to make comparisons between products based on meaningful information. TYPAR BuildingWrap was designed to pass the test in the laboratory, but more importantly, TYPAR has proven its performance during and after construction as the "Tough Choice" for almost two decades. We hope that with this objective, meaningful information, you will be able to make an informed decision about the purchase of housewrap. If you have further questions, please write or call. We are ready and waiting to assist you!


Can I use just any construction tape with TYPAR BuildingWrap?
TYPAR Construction Tape is the only tape that we could recommend to ensure that the TYPAR Weather Protection System is properly installed. You’re also protected by our system warranty when you use TYPAR tape and flashings.
Can TYPAR building wraps be applied over felt paper?
When stucco is installed over wood-based sheeting the 2006 IBC (Section 2510.6) and the 2006 IRC (Section R-703.6.3) require “a water-resistive barrier with a performance at least equivalent to two layers of Grade D paper” or a layer of WRB which is separated from the stucco by an “intervening layer”. When TYPAR water-resistive barrier is used behind stucco it should be separated from the stucco by a second layer of TYPAR water-resistive barrier, a layer of Grade D building paper or the Grade D paper backing of paper-backed lath.
What is the recommended distance between nails when installing TYPAR building wraps?
When attaching TYPAR on wood-base sheathing, such as 7/16” OSB or 15/32” plywood, apply plastic-capped staples or plastic-capped nails every 32 inches (vertically and horizontally). When attaching TYPAR on an open stud or non-structure sheathing, apply plastic-capped staples or plastic-capped nails long enough to penetrate the stud every 32 inches (vertically and horizontally). When installing TYPAR over steel frame, use screws with washers.
What is the best installation method for TYPAR building wraps, flashings and tape?
For complete installation instructions, visit the individual product pages. There you’ll find complete, downloadable PDF instructions for the entire system of products.
I need to know if TYPAR has a Florida Product Approval number. If so, what is it please?
Florida does not require an approval for housewrap products as it is part of the building code. However, Miami-Dade County has its own code requirement for impact-resistant products.
I am renovating the exterior of my home and installing foam board insulation, but I am receiving conflicting advice on how to wrap the house. Do I place TYPAR on before or after the foam board? I’m finishing with vinyl siding.
Foam board has been used as a replacement for OSB and plywood. TYPAR BuildingWrap in general, and TYPAR in particular, should be installed over the board as a final layer prior to the installation of cladding. TYPAR BuildingWrap will perform as the secondary water barrier.
A builder client of ours has installed TYPAR backwards at a rim joist location. Should this be of concern?
TYPAR BuildingWrap has a special UV coating on the light side that protects it from sunrays. If it is possible to replace it with the correct (the light) side out, you will be assured that the product performance is at its maximum. Also, incorrect installation may void your warranty.
Does TYPAR BuildingWrap have an ICBO number? An inspector has asked my installer for one, but we can’t seem to locate it.
TYPAR does not use ICBO numbers anymore. The ICC has combined all the old numbers under one new system. The new ICC number for BuildingWrap is ICC ESR-1404. You should eliminate your old ICBO numbers and begin using the new ICC numbers.
I’d like to give away TYPAR as incentives to local homebuilders. How can I have TYPAR printed with my company name and logo on it?
This is a great way for builders and dealers to promote their brands in association with the TYPAR line—especially in areas with strict signage regulations. There is a minimum order requirement, and TYPAR retains the right to review and approve the proposed logo and message. Your local TYPAR dealer can provide all the details and assist you in ordering product.


I was recently told your product is made by DuPont—the same people who make Tyvek®. Is this true? And what are the key differences between TYPAR and Tyvek?
This is probably the most-asked question that we receive. No, TYPAR is not made by DuPont. It is manufactured by Berry Plastics in Old Hickory, TN. To see the TYPAR Advantage, please check out the TYPAR vs. Tyvek comparison chart.
Our builder told us that installing Tyvek under cedar shingles may not be a good idea, but that we could install TYPAR in that application. Is this true?
Yes. Because TYPAR BuildingWrap has distinct advantages over any other building wrap product, TYPAR succeeds in many applications where other products may fall short, including under shingles. Please see the TYPAR vs. Tyvek comparison chart.


I have been working on my home for several years, and some of the TYPAR I originally installed has been exposed up to two years. I’m ready to install the siding. Should I install new TYPAR first? If so, do I have to remove the old?
TYPAR BuildingWrap needs to be covered within 6 months in order for your warranty to remain valid (within 12 months for TYPAR StormWrap and MetroWrap). It is also the recommended maximum exposure time to protect against UV exposure. With this in mind, you should remove the old TYPAR and reinstall new TYPAR prior to the installation of siding.

Tyvek® is a registered trademark of E.I. DuPont.