DuPont™ Tyvek® HomeWrap Building Envelope Solutions
The world’s leading house wrap, with more than 25 years performance on millions of homes.
DuPont created Tyvek® HomeWrap to have the optimum balance of properties for superior performance against the elements and the competition. When choosing DuPont™ Tyvek® HomeWrap, you can be assured you are using the leading brand of wall underlays.
A wall underlay is a home’s main protection against the damaging effects of the elements. The optimal wall underlay must include four key properties:
1. Air resistance to help prevent the flow of air through wall cavities and reduce drafts.
2. Moisture resistance to help protect the wall cavity from water that gets behind the cladding.
3. Moisture vapor permeability to promote drying of wall systems.
4. Durability to withstand the rigors of the construction site and to continue performing once construction is completed.
A balance of these four properties is crucial in helping to maintain the protection, comfort and efficiency of a home.
Defining the difference
DuPont™ Tyvek® HomeWrap is a nonwoven, nonperforated sheet made by spinning extremely fine, continuous, high-density polyethylene (HDPE) fibres that are fused together to form a strong, uniform web. The fibrous structure is engineered to create millions of microscopic pores that resist bulk water and air penetration while allowing moisture vapour to pass through. DuPont™ Tyvek® HomeWrap is the only product manufactured using this unique process; therefore, only DuPont™ Tyvek® HomeWrap achieves the optimal balance of air resistance, water resistance and moisture vapour permeability. Other wall underlays compromise such features as bulk water hold-out for vapour permeability, or vapour permeability for air resistance.
Air penetration resistance
One basic function of a wall underlay is to help insulation maintain its R-value by keeping air from infiltrating the wall system. The ability of a wall underlay in helping to prevent air infiltration directly relates to the energy costs of heating and cooling a home. Many wall underlays fail to meet the basic air barrier requirement of ≥0.1 MNs/m³. The high air resistance level of DuPont™ Tyvek® HomeWrap allows insulation to be more effective, helping to lower energy costs.
Bulk water hold-out and vapor permeability
The building industry continues to face challenges with moisture-related issues resulting from wall systems that failed to manage the incidental moisture that enters and cannot escape a wall cavity. High bulk water resistance and high drying potential are key components of creating the optimal wall system. DuPont™ Tyvek® HomeWrap has a high resistance to bulk water penetration, helping to reduce the damaging effects of moisture penetration. At the same time, the high Moisture Vapour Transmission Rate (MVTR) of DuPont™ Tyvek® HomeWrap ensures that water vapor does not linger in the walls, but passes to the outside where it belongs. A wall underlay should have a high perm rating so that the natural ability of a wall system to dry out is not impeded. The excellent moisture vapor permeability of DuPont™ Tyvek® HomeWrap helps prevent moisture accumulation in walls which can lead to the formation of mold, mildew and wood rot.
DuPont™ Tyvek® HomeWrap provides excellent tear strength and good wet strength combined with a superior UV resistance of 120 days. Conscientious builders choose DuPont™ Tyvek® HomeWrap over any other product because it withstands the rigors of the construction site and offers an easy solution to protect the homes they build from the harmful effects of the elements once construction is completed.
Additional Information (8)
- DuPont™ Tyvek® Water Resistive & Air Barriers Installation Guidelines (PDF)
- Codemark Tyvek® HomeWrap (PDF)
- Tyvek® HomeWrap MSDS (PDF)
- Tyvek® HomeWrap Building Science Bulletin (PDF)
- Understanding high perm and low perm Bulletin (PDF)
- DuPont UK wall and floor guidelines (PDF)
- Tyvek® vs Typar® Bulletin (PDF)
- MSDS File - DuPont™ Tyvek® for use in building construction (PDF)
INFORMATION & IDEAS
- Where to Buy Tyvek®
- Roof Underlay Durability
- Navigating Wall Assembly Fire Testing
- NFPA 285 Compliant Wall Assemblies With DuPont™ Tyvek®
- Vapor Permeable or Impermeable Building Envelope Materials, Does It Matter?
- Helpful Links
- Controlling Air Leakage
- Vapor Permeable Or Impermeable
- Understanding High Perm vs. Low Perm
- Truth About Permeability
- The Difference is Tyvek®
Are You Smarter Than Water?
The building industry continues to face litigation for moisture related issues from a failure to design and build forgiving wall systems that can manage moisture that enters the wall cavity. Make sure you use a weather barrier system that does not rely on reverse flashing the window opening and reverse flashing with seam tape as they can create a direct path for water intrusion.