Anchor Bolt Layout Planning

For the Joto-Vent System, a ventilation gap is created between the concrete foundation and the sill plate. The ICC-ES Acceptance Criteria (AC497) require that this gap be considered structurally when designing anchor bolt.

The maximum center-to-center spacing for each anchor bolt and diameter is provided in the ICC-ES report (ESR-4161). These values are used when designing with the prescriptive method.

Calculated Allowable Lateral Loads for Engineered System

For engineered designs, the ICC-ES report ESR-4161 provides allowable lateral load values calculated in accordance with AWC NDS Technical Report 12. These values reflect the shear resistance of the anchor bolt when a gap exists between the concrete (Main Member) and the sill plate (Side Member).

The table 2 summarizes allowable lateral loads for:

0” gap (without Joto-Vent)

3/4” gap (with 1×6 Joto-Vent)

1-1/2” gap (with 2×6 Joto-Vent)

These calculations serve as the basis for determining the required bolt spacing in engineered applications.

Summary of Joto-Vent Applications

For installation in accordance with the prescriptive provisions of the code, anchor bolts must be spaced as defined in Table 1 due to reduced lateral capacity for wind and seismic cased by the “gap” created by the Joto-Vent.

For engineered systems, anchor bolt capacity for wind and seismic loads shall be determined in accordance with NDS Technical Report 12. Table 2 provides a summary of the NDS TR 12 calculations for specific size anchor bolts and 3/4” and 1-1/2” thickness of the Joto-Vent.