The Joto-Vent System
Distributed by Interra USA, Inc. for the North American market
The Joto-Vent System is a new system for the US market, however, it has been used successfully in Japan for the past 45 years and it is their standard for crawl space ventilation.
As of May 2019, we have received our ICC certification under ICC-ESR-4161 which is accessible on the ICC website. And it can be accessed here: ICC-ES report.
The Joto-Vent system is a unique method for crawl space ventilation that is new to the US, but a traditional Japanese construction method. This system was invented to protect against the Japanese climate in addition to earthquakes. JOTO Techno has worked on inventing and expanding this system since 1974.
As of 2021, the Joto-Vent system was used on more than 5.3 million buildings in Japan. Today, 80% of new residential houses in Japan use a perimeter vent system, and regarding perimeter venting systems, Joto Techno holds a 60% market share in the Japanese market.
Looking for more details? Visit the Joto-Vent System’s website.
Joto-Vent System has been ICC-ES-certified since May 2019 View the ER report
Advantages of the Joto-Vent System
- Enables complete ventilation around the entire crawl space perimeter
- No need to cut holes in the structural framework
- High earthquake resistance and extreme durability
- Balanced and efficient ventilation throughout the entire crawl space
- Cost down
- Termite prevention
- A clean, finished architectural look of the outer wall bottom
The Joto-Vent System
We have spent a lot of time and effort to make sure the Joto-Vent System meets and exceeds all the IBC and IRC requirements for crawl space ventilation and moisture control. The Joto Vent System is comprised of three parts,
- The Joto-Vent
It is installed on top of the concrete foundation and under the sill plate. - The Ventilation Flashing
It is the architectural flashing to cover the vent and VIP, giving the system a clean and finished look. - The VIP (Ventilation and Insect Prevention) Flashing
Ventilation and Insect Prevention screen installed over the Joto-Vent.
The Joto-Vent sits on top of the concrete foundation and under the sill plate, thus the sill plate is NOT in direct contact with the concrete thus per IBC code, the sill plate does NOT have to be treated lumber. Hardware, therefore, does not have to be treated/galvanized as well. This is a great cost-saving and allows you the builders to apply for more Built Green points.
The Joto-Vent System also gets BUILT GREEN checklist points for moisture control and airflow efficiency. This, when used in conjunction with other environmental and healthy house-building practices assures the builder of BUILT GREEN points on every project.
Installation Option #1
This is one of the options using all three parts of the system. Some jurisdiction requires 1/8” for the bug screen. Then, we will need to use the “VIP” to exceed the requirement. This is the standard using two parts of the Joto Vent system. If you require ¼” for the bug screen, you can skip the use of the “VIP.” Then the system would be a 2-part system.
Installation Option #2
This is the standard using two parts of the Joto Vent system. If you require ¼” for the bug screen, you can skip the use of the “VIP.” Then the system would be a 2-part system.
Enables Ventilation
By installing the Joto-Vent around the perimeter of the concrete foundation, you get a positive/negative airflow that allows moist, damp, and stale air in the crawl space to be exchanged with fresh air from outside. This leads to a healthier more comfortable environment.
Preserves Structural Integrity
By using the Joto-Vent System, you no longer need to cut holes in your rim joist or form vent boxes in your concrete foundation. So, you can maintain the structural integrity of the foundation and rim joist.
For more details, please visit the Joto-Vent website.
Built Green
The Joto-Vent sits on top of the concrete foundation and under the sill plate, thus the sill plate is NOT in direct contact with the concrete thus per IBC code, the sill plate does NOT have to be treated lumber. Hardware, therefore, does not have to be treated/galvanized as well. This is a great cost-saving and allows you the builders to apply for more Built Green points.
The Joto-Vent System also gets BUILT GREEN checklist points for moisture control and airflow efficiency. When used in conjunction with other environmental and healthy house-building practices assures the builder of BUILT GREEN points on every project.
