Can I install Halo Exterra on the exterior of my walls without taping the joints if my wall assembly includes a layer of building paper (weather barrier) behind or on top of Halo Exterra?
If you’ve been wondering about this, you’re not alone. Many builders and homeowners are curious about the correct installation practices for Halo Exterra when used in conjunction with a weather-resistant barrier. In this blog post, we’ll explore the answer according to building codes in both Canada and the United States.
Installation in Canada
(Referencing the 2020 National Building Code of Canada)
Short Answer:
Yes, you can install Halo Exterra without taping the joints when it’s used solely as thermal insulation and another material serves as the weather-resistant barrier.
Understanding the Code Requirements
Halo Exterra as Thermal Insulation
When Halo Exterra functions only to provide thermal resistance, it helps meet the requirements of Section 9.36 – Energy Efficiency of the National Building Code of Canada (NBC). According to 9.25.2.3. – Installation of Thermal Insulation, the insulation must be installed properly to ensure energy efficiency.
First and Second Planes of Protection
Per 9.27.2.3.(1) a) & b) of the NBC, above-grade walls require two planes of protection against moisture:
- First Plane: The exterior cladding (e.g., siding or brick), which minimizes the entry of rain and snow.
- Second Plane: A weather-resistant barrier that intercepts any moisture that penetrates the first plane. This barrier must include a drainage plane and flashing to direct water back to the exterior, especially around wall penetrations like windows and doors.
Options for the Second Plane of Protection
As outlined in A-9.27.2.1.(1), acceptable options for the second plane include:
- An air space and sheathing membrane.
- Insulated sheathing with sealed joints.
- Two layers of sheathing membrane.
In your case, the building paper acts as the second plane of protection (the weather-resistant barrier), while Halo Exterra provides the thermal resistance. Therefore, taping the joints of Halo Exterra isn’t necessary because the building paper fulfills the code requirements for moisture protection.
Installation in the USA
(Referencing the 2018 International Residential Code)
Short Answer:
Yes, you can install Halo Exterra without taping the joints when it’s used solely for insulation and a separate material serves as the weather-resistant barrier.
Understanding the Code Requirements
Exterior Wall Envelope Requirements
According to R703.1 of the International Residential Code (IRC):
- Exterior walls must provide a weather-resistant envelope.
- The envelope must include flashing as per R703.4 to prevent water intrusion.
Water Resistance and Barrier Requirements
Per R703.1.1:
- The wall must prevent water accumulation by providing a water-resistant barrier behind the exterior cladding.
- There must be a means to drain any water that penetrates the cladding.
Approved Water-Resistive Barriers
Section R703.2 specifies:
- One layer of No. 15 asphalt felt or another approved water-resistive barrier must be applied over studs or sheathing.
- The barrier must be installed continuously to the top of walls and properly terminated at penetrations and building appendages.
Application to Halo Exterra Installation
In your wall assembly:
- The building paper serves as the water-resistant barrier, complying with IRC requirements.
- Halo Exterra functions as the thermal insulation, helping meet the energy efficiency requirements of Chapter 11 – Energy Efficiency.
- Taping the joints of Halo Exterra is not required because the building paper provides the necessary moisture protection.
Key Takeaways
- Taping Not Required: When using a proper weather-resistant barrier like building paper, you don’t need to tape the joints of Halo Exterra.
- Compliance with Codes: This installation method complies with both Canadian and U.S. building codes, as long as all other code requirements are met.
- Role of Halo Exterra: In this configuration, Halo Exterra serves as thermal insulation, enhancing the energy efficiency of your building.
- Importance of the Weather Barrier: The building paper or other approved material acts as the second plane of protection, preventing moisture from entering the wall assembly.
Final Thoughts
Proper installation is crucial for the performance and longevity of your building materials. By understanding and adhering to local building codes, you ensure that your structure is both safe and efficient. If you’re ever unsure, it’s always a good idea to consult with local building officials or a professional engineer to confirm that your installation meets all applicable codes and standards.
At BuildwithHalo.com, we’re committed to providing you with the information you need to make informed decisions about your building projects. If you have any further questions or need additional guidance, feel free to reach out to our team of experts.
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